Updated on 2022/10/01

写真a

 
ISHIDA Naoyuki
 
Organization
Faculty of Natural Science and Technology Associate Professor
Position
Associate Professor
External link

Degree

  • 博士(工学) ( 京都大学 )

Research Interests

  • 表面間力

  • コロイド・界面化学

  • 表面ナノ構造

  • Recycling

  • Fine Particle

  • 原子間力顕微鏡

  • Surface Force

Research Areas

  • Nanotechnology/Materials / Functional solid state chemistry

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Transport phenomena and unit operations

Education

  • Kyoto University   工学研究科   化学工学専攻

    1997.4 - 2000.3

      More details

    Country: Japan

    researchmap

Research History

  • Okayama University   自然科学研究科   Associate Professor

    2012.4

      More details

Committee Memberships

  • 日本油化学会   関西支部幹事  

    2020.4   

  • 日本化学会 コロイドおよび界面化学部会   討論会委員会副委員長  

    2019.4   

  • 日本化学会 コロイドおよび界面化学部会   事業企画委員会副委員長  

    2019.4   

  • 日本化学会 コロイドおよび界面化学部会   Okinawa Colloids 2019 副実行委員長  

    2019.4 - 2019.11   

  • 日本化学会 コロイドおよび界面化学部会   国際交流委員会副委員長  

    2017.4 - 2019.4   

  • 日本化学会 コロイドおよび界面化学部会   幹事  

    2015.4   

      More details

    Committee type:Academic society

  • 岡山地区化学工学懇話会   幹事  

    2014.4   

      More details

    Committee type:Academic society

  • 粉体工学会   英文誌編集委員  

    2013.4   

      More details

    Committee type:Academic society

  • 粉体工学会   和文誌編集委員  

    2013.4   

      More details

    Committee type:Academic society

  • 日本油化学会   オレオサイエンス誌編集委員  

    2012.4 - 2016.3   

      More details

    Committee type:Academic society

  • 日本化学会 コロイドおよび界面化学部会   事業企画委員  

    2011.4 - 2019.3   

      More details

    Committee type:Academic society

  • 日本化学会 コロイドおよび界面化学部会   第67回コロイドおよび界面化学討論会 国際セッションオーガナイザー  

    2016.4 - 2016.9   

      More details

    Committee type:Academic society

  • 化学工学会中国四国支部   役員・事務局  

    2015.7 - 2019.7   

      More details

    Committee type:Academic society

  • 日本化学会 コロイドおよび界面化学部会   国際交流委員  

    2015.4 - 2021   

  • 日本化学会 コロイドおよび界面化学部会   先端技術講座 第3回先端エレクトロニクスのためのコロイド・界面化学 (E-colloid) 主査  

    2014.4 - 2014.12   

      More details

    Committee type:Academic society

  • 日本化学会 コロイドおよび界面化学部会   第29回界面コロイドラーニング 主査  

    2013.4 - 2013.12   

      More details

    Committee type:Academic society

  • 日本化学会 コロイドおよび界面化学部会   第28回界面コロイドラーニング 副査  

    2012.4 - 2012.12   

      More details

    Committee type:Academic society

▼display all

 

Papers

  • Extraordinary high preservation of the dispersion state of Au nanoparticles during freeze-thawing and freeze-drying with gum arabic Reviewed

    Miki Kadowaki, Tsutashi Matsuura, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    Colloids and Surfaces A: Physicochemical and Engineering Aspects   639   2022.4

     More details

    Publishing type:Research paper (scientific journal)  

    A series of edible and non-toxic substances were screened for their ability to prevent Au nanoparticles (AuNPs) from undergoing aggregation during both freeze-thawing and freeze-drying at as low an additive concentration as possible. Gum arabic was found to be an ideal choice. The addition of 20 µg/mL of gum arabic greatly inhibited the aggregation of AuNPs during freeze-thawing and -drying, whereas polyvinylpyrrolidone was the next best among the tested substances, with approximately 20% aggregation during freeze-drying at a concentration of less than 200 µg/mL. The zeta potential value of the AuNPs indicated the absence of the specific binding of gum arabic to the AuNPs surface. Surface enhanced infrared spectroscopic (SEIRAS) analyses were conducted for the gum arabic solution, frozen and freeze-dried on the Au particles. The results indicated that, in the frozen state, gum arabic molecules were concentrated in remaining unfrozen liquid on the Au coating without any specific orientation toward the Au surface. In contrast, SEIRAS spectra of freeze-dried gum arabic indicated that carboxylic groups in gum arabic molecules preferentially became closer to the Au surface. Considering these findings, during freeze-thawing, we conclude that the high thickening property of gum arabic gum plays an important role in minimizing the mobility and thus the aggregation of AuNPs in the freeze-concentrated regions between frozen ice crystals. The freeze-drying of a gum arabic solution produces a rigid amorphous matrix that has an affinity for the Au surface. The AuNPs were individually separated and immobilized in the freeze-dried matrix of the gum arabic, resulting in the extraordinary inhibition of their aggregation.

    DOI: 10.1016/j.colsurfa.2022.128392

    Scopus

    researchmap

  • Dense immobilization of gold nanoparticles onto a cotton textile for obtaining plasmonic heating Reviewed

    Nobuko Fukuda, Naoyuki Ishida

    MRS Advances   2022.3

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1557/s43580-022-00262-x

    researchmap

  • Comparison of improvements of aqueous dissolution of structurally analogous hydrophobic drugs by amorphous solid dispersion Reviewed

    Takashi Okamoto, Kayoko Yamamoto, Takanari Sekitoh, Akiho Fujioka, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    Colloids and Surfaces A: Physicochemical and Engineering Aspects   632   127744 - 127744   2022.1

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.colsurfa.2021.127744

    researchmap

  • Spontaneous foaming during vacuum drying of polyvinylpyrrolidone- and sugar-alcohol mixtures and enhancement of water-dissolution of water insoluble drug Reviewed

    Olivier Tramis, Akiho Fujioka, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    Drying Technology   40 ( 3 )   604 - 614   2022

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/07373937.2020.1822863

    researchmap

  • Induction of foaming in vacuum drying by needle stimulation and the impact of solution viscosity, vapor pressure, and the type of solute and solvent Reviewed

    Akiho Fujioka, Rina Yamamoto, Olivier Tramis, Hiroaki Ishida, Tsutomu Ono, Naoyuki Ishida, Koreyoshi Imamura

    Drying Technology   1 - 13   2021.12

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/07373937.2021.2017965

    researchmap

  • Foaming characteristics of sugar- and polyvinylpyrrolidone-alcohol solutions during vacuum foam drying: A rheological approach Reviewed

    Olivier Tramis, Akiho Fujioka, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   627   2021.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER  

    Vacuum foam drying offers great perspectives to formulate solid-state encapsulated active drugs. Taking into account the specific need of pharmaceutical formulations to keep drug molecules active and dispersed, we show in this paper that vacuum drying of pharmaceutical formulations can be substantially improved by using original rheological approaches. Typically, our formulations totally dried-up in less than 5 min, a delay much shorter than the long hours of the traditional vacuum drying process. Steady-shear rheology was used to evaluate the solution's specific viscosity against the solutions' concentrations, in order to correlate the dilution regime to the foamabiltiy. This rheological approach indicated that in miscible solutions, spontaneous foaming occurred in the semi-dilute entangled regime, near the transition to the concentrated regime; for partially miscible solutions, it occurred in solutions at a concentration near to the percolation concentration. The proposed methodology is versatile, and should provide a simple way to assess the foamability of pharmaceutical formulations.

    DOI: 10.1016/j.colsurfa.2021.127174

    Web of Science

    researchmap

  • Direct measurements of interaction forces of bovine serum albumin and lysozyme with stainless steel by atomic force microscopy Reviewed

    Hikaru Kawaguchi, Hiroyuki Imanaka, Koreyoshi Imamura, Naoyuki Ishida

    Colloids and Surfaces A: Physicochemical and Engineering Aspects   627   127137 - 127137   2021.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.colsurfa.2021.127137

    researchmap

  • Inhibiting Au nanoparticle aggregation in freeze-thawing by presence of various additives Reviewed

    Miki Kadowaki, Hidetaka Yokota, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    Advanced Powder Technology   32 ( 10 )   3517 - 3524   2021.10

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.apt.2021.08.002

    researchmap

  • Crystallization characteristics of amorphous trehalose dried from alcohol Reviewed

    Takanari Sekitoh, Takashi Okamoto, Akiho Fujioka, Tomohiko Yoshioka, Shinji Terui, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    Journal of Food Engineering   292   110325 - 110325   2021.3

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jfoodeng.2020.110325

    researchmap

  • Direct measurement of interaction force between hydrophilic silica surfaces in triblock copolymer solutions with salt by atomic force microscopy Reviewed

    Takumi Deguchi, Takato Nakahara, Koreyoshi Imamura, Naoyuki Ishida

    Advanced Powder Technology   32 ( 1 )   30 - 36   2021.1

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.apt.2020.11.011

    researchmap

  • Ultrafast charge transfer at the electrode−electrolyte interface via an artificial dielectric layer Reviewed

    Takashi Teranishi, Kaisei Kozai, Sou Yasuhara, Shintaro Yasui, Naoyuki Ishida, Kunihiro Ishida, Masanobu Nakayama, Akira Kishimoto

    Journal of Power Sources   494   229710 - 229710   2021

     More details

    Publishing type:Research paper (scientific journal)  

    We report ultrafast charge transfer along the Li-ion pathway via a dielectric layer at the electrolyte−electrode interface. The rate capabilities of dielectric-modified cathodes were evaluated as a function of the combination of electrolyte solvents and dielectric layers having various dielectric constants, εr. The high-rate capability was enhanced when the loaded dielectric layer's εr was close to that of the electrolyte solvent. Density functional theory molecular dynamics calculations and atomic force microscope force measurements confirmed that the activation energies related to Li+ adsorption and desolvation were notably reduced when the loaded dielectric layer's εr approached that of the solvent. In this case, the solvated Li+ ion preferentially underwent desolvation on the solid surface. The discharge capacity at the ultrahigh rate of 50 C (1 C = 160 mA g−1) of the dielectric-modified thin films steadily increased with increasing length of the dielectrics−electrode−electrolyte triple-phase interface (TPI). Experimental and computational results reveal that, when the permittivity of the dielectrics and solvent are similar, solvated Li+ ions are preferentially involved in the physical adsorption and desolvation on the dielectric surface, followed by Li+ intercalation near the TPI.

    DOI: 10.1016/j.jpowsour.2021.229710

    Scopus

    researchmap

  • The Use of a Combination of a Sugar and Surfactant to Stabilize Au Nanoparticle Dispersion against Aggregation during Freeze-Drying Reviewed

    Hidetaka Yokota, Miki Kadowaki, Tsutashi Matsuura, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    Langmuir   36 ( 24 )   6698 - 6705   2020.6

     More details

    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acs.langmuir.0c00695

    researchmap

  • Sole-amorphous-sugar-based solid dispersion of curcumin and the influence of formulation composition and heat treatment on the dissolution of curcumin Reviewed

    Takanari Sekitoh, Takashi Okamoto, Akiho Fujioka, Olivier Tramis, Koji Takeda, Tsutashi Matsuura, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    Drying Technology   39 ( 14 )   1 - 10   2020.4

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/07373937.2020.1752711

    researchmap

  • Immobilization of surface non-affinitive protein onto a metal surface by an external electric field Reviewed

    Olivier Tramis, Ryosuke Iizuka, Hajime Nakao, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    Journal of Bioscience and Bioengineering   129 ( 3 )   348 - 353   2020.3

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jbiosc.2019.09.008

    researchmap

  • Controlling the drying process in vacuum foam drying under low vacuum conditions by inducing foaming by needle stimulation of the solution Reviewed

    Fumihiro Hidaka, Tomo Satoh, Akiho Fujioka, Koji Takeda, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    Drying Technology   37 ( 12 )   1520 - 1527   2019.9

     More details

    Publishing type:Research paper (scientific journal)  

    Vacuum foam drying is a promising drying technique but an extremely high vacuum is needed to achieve “foaming.” The findings reported herein show that, when a solution is partially vacuum-dried to 0.05–2 g-solvent/g-dry matter (initial drying) and the solution is then punctured with a steel needle (needle stimulation), vacuum drying resumes as a result of the solution foaming, even under conditions of an insufficient vacuum (ca. 1,000 Pa) where foaming is minimal. Methanol, ethanol, and isopropanol were used as solvents, and sugar and different molecular weight polyvinylpyrrolidone were employed as solutes. The results indicate that needle puncturing introduces minute bubbles, which then triggers foaming.

    DOI: 10.1080/07373937.2018.1517363

    Scopus

    researchmap

  • Forces between zinc sulphide surfaces; amplification of the hydrophobic attraction by surface charge Reviewed International coauthorship

    E-Jen Teh, Naoyuki Ishida, William M. Skinner, Drew Parsons, Vincent S. J. Craig

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   21 ( 36 )   20055 - 20064   2019.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Smooth Zinc Sulphide (ZnS) surfaces were prepared by magnetron sputtering and the interaction forces were measured between them as a function of pH. At the isoelectric point (iep) of pH 7.1 the attractive force was well described by the van der Waals interaction calculated using Lifshitz theory for a layered system. Away from the iep, the forces were fitted using DLVO theory extended to account for surface roughness. At pH 9.8 the surfaces acquire a negative charge and an electrostatic repulsion is evident. Below the iep the surfaces acquire a positive charge leading to electrostatic repulsion. The forces in the range 3.8 < pH < 4.8 show an additional attraction on approach and much greater adhesion than at other pH values. This is attributed to the hydrophobic attraction being amplified by a small degree of charge on the surface as has previously been reported for adhesion measurements. The range of the measured forces is attributed to the long-range orientational order of water (>5 nm).

    DOI: 10.1039/c9cp02797a

    Web of Science

    researchmap

  • Physical Stability of an Amorphous Sugar Matrix Dried From Methanol as an Amorphous Solid Dispersion Carrier and the Influence of Heat Treatment Reviewed

    Koji Takeda, Takanari Sekitoh, Akiho Fujioka, Kayoko Yamamoto, Takashi Okamoto, Tsutashi Matsuura, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    JOURNAL OF PHARMACEUTICAL SCIENCES   108 ( 6 )   2056 - 2062   2019.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE INC  

    An amorphous sugar matrix, after drying from an organic solvent, was investigated for use as a method for dispersing hydrophobic drugs (solid dispersion). However, the amorphous sugar, originally contained in the organic solvent, had a significantly low glass transition temperature (T-g), thus rendering it physically unstable. In this study, we examined the physicochemical properties of a sugar in a dried matrix and in an organic solvent, using alpha-maltose and methanol as a representative sugar and organic solvent. The apparent molar volume of alpha-maltose was similar to 30% smaller in methanol than in water. The methanol-originated amorphous alpha-maltose exhibited a much greater degree of hydrogen bonding than the water-originated one. Considering these findings, we conclude that the alpha-maltose maintained its compact conformation in the dried state and consequently caused the markedly low T-g. Second, it was found that heating under appropriate conditions resulted in an increase in the T-g of the methanol-originated amorphous alpha-maltose as well as a decrease in the level of hydrogen bonding. The aqueous dissolution of 2 model hydrophobic drugs (indomethacin and ibuprofen) from the solid dispersion was also improved as the result of the heat treatment, whereas, to the contrary, the dissolution of another model drug (curcumin) was lowered. (c) 2019 American Pharmacists Association (R). Published by Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.xphs.2019.01.008

    Web of Science

    researchmap

  • Direct Measurement of Interaction Forces between Surfaces in Liquids Using Atomic Force Microscopy Reviewed International coauthorship International journal

    Naoyuki Ishida, Vincent S. J. Craig

    KONA Powder and Particle Journal   36   187 - 200   2019.1

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Hosokawa Powder Technology Foundation  

    DOI: 10.14356/kona.2019013

    researchmap

  • Adsorption characteristics of various proteins on a metal surface in the presence of an external electric potential Reviewed

    Ei Ei Htwe, Yuhi Nakama, Yuko Yamamoto, Hiroshi Tanaka, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    Colloids and Surfaces B: Biointerfaces   166   262 - 268   2018.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier B.V.  

    The effect of the properties of a protein on its adsorption to a metal surface in the presence of external electric potential was investigated. Protein adsorption processes at different surface potentials were measured for fifteen types of proteins using an in-situ ellipsometry. The tested proteins were classified into three groups, based on the amount of protein that was adsorbed as a function of the surface potential: In First group of proteins, an increasing trend for the amount adsorbed with a more positive surface potential was found
    The amount adsorbed of α-chymotrypsinogen A and ribonuclease A (Second group) were roughly constant and independent of the applied surface electric potentials
    In Third group, the amount adsorbed decreased with increasing surface potential. This protein classification was correlated with the isoelectric points of the proteins (First group: ≤9.3
    Second group: 9.3–10
    Third group: &gt
    10). Increasing the pH positively and negatively shifted the surface potentials, allowing ß-lactoglobulin (First group) and lysozyme (Third) to become adsorbed, respectively. The surface potential range for protein adsorption was also markedly shifted depending on the metal substrate type. These findings were interpreted based on the electrostatic interactions among the protein, surface hydroxyl groups, and the applied external electric field.

    DOI: 10.1016/j.colsurfb.2018.03.035

    Web of Science

    Scopus

    researchmap

  • Stratification of Colloidal Particles on a Surface: Study by a Colloidal Probe Atomic Force Microscopy Combined with a Transform Theory Reviewed

    Ken Ichi Amano, Taira Ishihara, Kota Hashimoto, Naoyuki Ishida, Kazuhiro Fukami, Naoya Nishi, Tetsuo Sakka

    Journal of Physical Chemistry B   122 ( 16 )   4592 - 4599   2018.4

     More details

    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society ({ACS})  

    © 2018 American Chemical Society. Colloidal probe atomic force microscopy (CP-AFM) can be used for measuring force curves between the colloidal probe and the substrate in a colloidal suspension. In the experiment, an oscillatory force curve reflecting the layer structure of the colloidal particles on the substrate is usually obtained. However, the force curve is not equivalent to the interfacial structure of the colloidal particles. In this paper, the force curve is transformed into the number density distribution of the colloidal particles as a function of the distance from the substrate surface using our newly developed transform theory. It is found by the transform theory that the interfacial stratification is enhanced by an increase in an absolute value of the surface potential of the colloidal particle, despite a simultaneous increase in a repulsive electrostatic interaction between the substrate and the colloidal particle. To elucidate the mechanism of the stratification, an integral equation theory is employed. It is found that crowding of the colloidal particles in the bulk due to the increase in the absolute value of the surface potential of the colloidal particle leads to pushing out some colloidal particles to the wall. The combined method of CP-AFM and the transform theory (the experimental-theoretical study of the interfacial stratification) is related to colloidal crystallization, glass transition, and aggregation on a surface. Thus, the combined method is important for developments of colloidal nanotechnologies.

    DOI: 10.1021/acs.jpcb.8b01082

    Web of Science

    Scopus

    PubMed

    researchmap

  • Hydrophobic Attraction Measured between Asymmetric Hydrophobic Surfaces Reviewed International coauthorship International journal

    Naoyuki Ishida, Kohei Matsuo, Koreyoshi Imamura, Vincent S. J. Craig

    Langmuir   34 ( 12 )   3588 - 3596   2018.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society  

    The interaction forces between silica surfaces modified to different degrees of hydrophobicity were measured using colloidal probe atomic force microscopy (AFM). A highly hydrophobic silica particle was prepared with octadecyltrichlorosilane (OTS), and the interaction forces were measured against silica substrates modified to produce surfaces of varying hydrophobicity. The interaction forces between the highly hydrophobic particle and a completely hydrophilic silicon wafer surface fitted well to the DLVO theory, indicating that no additional (non-DLVO) forces act between the surfaces. When the silicon wafer surface was treated to produce a contact angle of water on surface of 40°, an additional attractive force that is longer ranged than the van der Waals force was observed between the surfaces. The range and magnitude of the attractive force increase with the contact angle of water on the substrate. Beyond the effect on the contact angle, the hydrocarbon chain length and the terminal groups of hydrophobic layer on the substrate only have a minor effect on the magnitude of the force, even when the substrate is terminated with polar carboxyl groups, provided the hydrophobicity of the other surface is high.

    DOI: 10.1021/acs.langmuir.7b04246

    Web of Science

    Scopus

    researchmap

  • Influence of an external electric field on removal of protein fouling on a stainless steel surface by proteolytic enzymes Reviewed

    Ei Ei Htwe, Yuhi Nakama, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    COLLOIDS AND SURFACES B-BIOINTERFACES   159   118 - 124   2017.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Enzymatic cleaning is a potentially useful method for removing proteinaceous fouling from solid surfaces under mild conditions. Herein, the influence of an external electric field on the enzymatic cleaning of a metal surface fouled with a protein was investigated. The model fouling protein (BSA; lysozyme) was prepared on a stainless steel (St) surface, and the resulting surface subjected to enzymatic cleaning with an electric potential being applied to the St plate. Trypsin, alpha-chymotrypsin, and thermolysin were used as model proteases. The amounts of protein remaining on the plate before and during the cleaning process were measured by means of a reflection absorption technique using Fourier transform infrared spectroscopy. In the case for BSA fouling, the cleaning efficiency of the protease tended to increase at more negative applied potentials. Whereas, there was an optimum applied potential for removing the lysozyme fouling. Atomic force microscopy analyses indicated that applying an adequate range of electric potential enhanced the enzymatic removal of protein fouling inside scratches on the St plate surface. These findings suggest the existence of two modes of electrostatic interactions for the external electric field, one with protease molecules and the other with digested fragments of the fouling protein. (C) 2017 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.colsurfb.2017.07.074

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Characteristics of proteinaceous additives in stabilizing enzymes during freeze-thawing and -drying Reviewed

    Takanori Shimizu, Tamayo Korehisa, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY   81 ( 4 )   687 - 697   2017.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS LTD  

    Protein-stabilizing characteristics of sixteen proteins during freeze-thawing and freeze-drying were investigated. Five enzymes, each with different instabilities against freezing and dehydration, were employed as the protein to be stabilized. Proteinaceous additives generally resulted in greater enzyme stabilization during freeze-thawing than sugars while the degree of stabilization for basic lysozyme and protamine were inferior to that of neutral and acidic proteins. Freeze-drying-induced inactivation of enzyme was also reduced by the presence of a proteinaceous additive, the extent of which was lower than that for a sugar. In both freeze thawing and freeze drying, the enzymes stabilization by the proteinaceous additive increased with increasing additive concentration. The enhancement of enzyme inactivation caused by pH change was also reduced in the presence of proteinaceous additives. The combined use of a sugar such as sucrose and dextran tended to increase the stabilizing effect of the proteinaceous additive.

    DOI: 10.1080/09168451.2016.1274637

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Surfactant-Free Solid Dispersions of Hydrophobic Drugs in an Amorphous Sugar Matrix Dried from an Organic Solvent Reviewed

    Koji Takeda, Yuto Gotoda, Daichi Hirota, Fumihiro Hidaka, Tomo Sato, Tsutashi Matsuura, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    MOLECULAR PHARMACEUTICS   14 ( 3 )   791 - 798   2017.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    The technique for homogeneously dispersing hydrophobic drugs in a water-soluble solid matrix (solid dispersion) is a subject that has been extensively investigated in the pharmaceutical industry. Herein, a novel technique for dispersing a solid, without the need to use a surfactant, is reported. A freeze-dried amorphous sugar sample was dissolved in an organic solvent, which contained a soluble model hydrophobic component. The suspension of the sugar and the model hydrophobic component was vacuum foam dried to give a solid powder. Four types of sugars and methanol were used as representative sugars and the organic medium. Four model drugs (indomethacin, ibuprofen, gliclazide, and nifedipine) were employed. Differential scanning calorimetry analyses indicated that the sugar and model drug (100:1) did not undergo segregation during the drying process. The dissolution of the hydrophobic drugs in water from the solid dispersion was then evaluated, and the results indicated that the C-max and AUC(0-60) (min) of the hydrophobic drug in water were increased when the surfactant-free solid dispersion was used. Palatinose and/or alpha-maltose were superior to the other tested carbohydrates in increasing C-max and AUC(0-60 min), for all tested model drugs, and the model drug with a lower water solubility tended to exhibit a greater extent of over-dissolution.

    DOI: 10.1021/acs.molpharmaceut.6b01048

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Adsorption of lysozyme on base metal surfaces in the presence of an external electric potential Reviewed

    Ei Ei Htwe, Yuhi Nakama, Hiroshi Tanaka, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    COLLOIDS AND SURFACES B-BIOINTERFACES   147   9 - 16   2016.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    The impact of external electric potential on the adsorption of a protein to base metal surfaces was examined. Hen egg white lysozyme (LSZ) and six types of base metal plates (stainless steel SUS316L (St), Ti, Ta, Zr, Cr, or Ni) were used as the protein and adsorption surface, respectively. LSZ was allowed to adsorb on the surface under different conditions (surface potential, pH, electrolyte type and concentration, surface material), which was monitored using an ellipsometer. LSZ adsorption was minimized in the potential range above a certain threshold and, in the surface potential range below the threshold, decreasing the surface potential increased the amount of protein adsorbed. The threshold potential for LSZ adsorption was shifted toward a positive value with increasing pH and was lower for Ta and Zr than for the others. A divalent anion salt (K2SO4) as an electrolyte exhibited the adsorption of LSZ in the positive potential range while a monovalent salt (KCI) did not. A comprehensive consideration of the obtained results suggests that two modes of interactions, namely the electric force by an external electric field and electrostatic interactions with ionized surface hydroxyl groups, act on the LSZ molecules and determine the extent of suppression of LSZ adsorption, All these findings appear to support the view that a base metal surface can be controlled for the affinity to a protein by manipulating the surface electric potential as has been reported on some electrode materials. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.colsurfb.2016.07.042

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Surfactant-free solid dispersion of fat-soluble flavour in an amorphous sugar matrix Reviewed

    Tomo Satoh, Fumihiro Hidaka, Kento Miyake, Natsuki Yoshiyama, Koji Takeda, Tsutashi Matsuura, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    FOOD CHEMISTRY   197   1136 - 1142   2016.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCI LTD  

    A solid dispersion technique to homogeneously disperse hydrophobic ingredients in a water-soluble solid without using surfactant was examined as follows: first, freeze-dried amorphous sugar was dissolved in an organic medium that contained a soluble model hydrophobic component. Second, the mixed solution of sugar and the model hydrophobic component was vacuum dried into a solid (solid dispersion). Methanol and six fat-soluble flavours, including cinnamaldehyde, were used as organic media and model hydrophobic components. The retention of flavours in the solid dispersion during drying and storage under vacuum was evaluated. The amorphised disaccharides dissolved in methanol up to 100 mg/mL, even temporarily (20 s to 10 days) and could be solidified without any evidence of crystallisation and segregation from flavour. The solid dispersion, prepared using a-maltose usually showed 65-95% flavour retention during drying (and storage for cinnamaldehyde), whereas &gt;= 50% of the flavour was lost when the flavour was O/W emulsified with a surfactant and then freeze-dried with sugar. (C) 2015 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.foodchem.2015.11.097

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Nanostructures of 3-aminopropyltriethoxysilane created on flat substrate by combining colloid lithography and vapor deposition Reviewed

    Naoyuki Ishida, Ryohei Nishihara, Hiroyuki Imanaka, Koreyoshi Imamura

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   495   39 - 45   2016.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    The creation of patterned structures with micro/nano-scale lengths on flat surfaces has recently been emerged as an important technique in various fields. In this report, we present a simple method to create nanopatterns of 3-aminopropyltriethoxysilane (APS) on glass substrates by the combination of colloid lithography and vapor deposition. When deposition was conducted at room temperature under natural humidity, an array of nanorings was formed on the substrate by the condensation of APS vapor on the water bridges remaining under the particles. By varying only the deposition temperature, the structure of the ordered arrays could easily be transformed: nanorings were converted to honeycomb and dot like structures by increasing temperature. This transformation proposedly occurred by the condensation and polymerization of APS vapor through the deformed particles of the colloidal monolayer. We also fabricated a patterned polymer brush array and a pore array using the obtained APS nanopattern as a template. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.colsurfa.2016.01.047

    Web of Science

    researchmap

  • The use of a proteinaceous "cushion" with a polystyrene-binding peptide tag to control the orientation and function of a target peptide adsorbed to a hydrophilic polystyrene surface Reviewed

    Hiroyuki Imanaka, Daisuke Yamadzumi, Keisuke Yanagita, Naoyuki Ishida, Kazuhiro Nakanishi, Koreyoshi Imamura

    BIOTECHNOLOGY PROGRESS   32 ( 2 )   527 - 534   2016.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

    In immobilizing target biomolecules on a solid surface, it is essential (i) to orient the target moiety in a preferred direction and (ii) to avoid unwanted interactions of the target moiety including with the solid surface. The preferred orientation of the target moiety can be achieved by genetic conjugation of an affinity peptide tag specific to the immobilization surface. Herein, we report on a strategy for reducing the extent of direct interaction between the target moiety and surface in the immobilization of hexahistidine peptide (6His) and green fluorescent protein (GFP) on a hydrophilic polystyrene (PS) surface: Ribonuclease HII from Thermococcus kodakaraensis (cHII) was genetically inserted as a cushion between the PS-affinity peptide tag and target moiety. The insertion of a cushion protein resulted in a considerably stronger immobilization of target biomolecules compared to conjugation with only a PS affinity peptide tag, resulting in a substantially enhanced accessibility of the detection antibody to the target 6His peptide. The fluorescent intensity of the GFP moiety was decreased by approximately 30% as the result of fusion with cHII and the PS-affinity peptide tag but was fully retained in the immobilization on the PS surface irrespective of the increased binding force. Furthermore, the fusion of cHII did not impair the stability of the target GFP moiety. Accordingly, the use of a proteinaceous cushion appears to be promising for the immobilization of functional biomolecules on a solid surface. (c) 2016 American Institute of Chemical Engineers Biotechnol. Prog., 32:527-534, 2016

    DOI: 10.1002/btpr.2232

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Effect of surface hydrophobicity on short-range hydrophobic attraction between silanated silica surfaces Reviewed

    Yuhei Soga, Hiroyuki Imanaka, Koreyoshi Imamura, Naoyuki Ishida

    ADVANCED POWDER TECHNOLOGY   26 ( 6 )   1729 - 1733   2015.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    The interaction forces between silanated silica surfaces without nanobubbles were measured using colloidal probe atomic force microscopy (AFM). To obtain hydrophobic surfaces without nanobubbles, an aqueous solution was introduced between the surfaces following an exchange process involving several solvents. In the obtained approaching force curves, an attractive force was observed from a distance of 10-20 nm, which is an additional attractive force stronger than typical van der Waals attractions. When the surface hydrophobicity decreased, the range of this attraction decreased slightly; the attraction disappeared when the surface contact angle was below 90 degrees. In contrast, measurements in the water-ethanol mixtures revealed that the attraction persisted even when the contact angle was well below 90 degrees. The possible origin of this force was discussed on the basis of the obtained results. (C) 2015 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan.

    DOI: 10.1016/j.apt.2015.10.017

    Web of Science

    researchmap

  • Inhibitory effects of additives and heat treatment on the crystallization of freeze-dried sugar Reviewed

    Kohshi Kinugawa, Mitsunori Kinuhata, Ryo Kagotani, Hiroyuki Imanaka, Naoyuki Ishida, Mizuki Kitamatsu, Kazuhiro Nakanishi, Koreyoshi Imamura

    JOURNAL OF FOOD ENGINEERING   155   37 - 44   2015.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCI LTD  

    An amorphous matrix of a sugar is frequently used as a bulk-forming and stabilizing agent in the food industry but tends to crystallize as the result of water uptake and increase in temperature. Additives and methods used to inhibit the crystallization of amorphous sugar (sucrose) were screened in this study. Freeze-dried amorphous sucrose containing 0.5-5 wt% of additive, including salts, different types of sugars, and polymers, the crystallization temperature (T-cry) and isothermal crystallization characteristics were examined. Certain types of salts markedly increased the Tcry and prolonged the induction period for crystal nucleation. The use of 1 wt% MgCl2 was particularly effective in inhibiting sugar crystallization. The heat treatment of crystalline sucrose under appropriate conditions was also found to result in diminished sucrose crystallization. MALDI-TOF mass spectra of the heat-treated sucrose suggested that sucrose derivatives containing multiple pyranose groups were formed, which would closely relate to the crystallization inhibition. Finally, the protein stabilizing effects of the matrices were evaluated. The results indicated that both the addition of additives and the heat treatment resulted in an improvement of the protein stabilizing effect of amorphous sugar matrix, compared to that of sucrose alone. (C) 2015 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jfoodeng.2015.01.016

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Influence of sugar surfactant structure on the encapsulation of oil droplets in an amorphous sugar matrix during freeze-drying Reviewed

    Shota Nakayama, Yoshifumi Kimura, Sayuri Miki, Jun Oshitani, Takashi Kobayashi, Shuji Adachi, Tsutashi Matsuura, Hiroyuki Imanaka, Naoyuki Ishida, Hiroko Tada, Kazuhiro Nakanishi, Koreyoshi Imamura

    FOOD RESEARCH INTERNATIONAL   70   143 - 149   2015.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    The encapsulation of O/W emulsion droplets in a freeze-dried amorphous sugar matrix was investigated, focusing on the impact of the molecular structure of the emulsifying surfactant. O/W emulsions, containing various surfactants, were freeze-dried in the presence of a sugar. Thirty types of surfactants, including eighteen different sugar surfactants and ten types of commercially available sugar ester mixtures, were used. Linoleic acid methyl ester and trehalose were used as the oil phase and sugar. The amounts of oil droplets encapsulated in freeze-dried amorphous sugar matrix were analyzed by Fourier transform Infrared spectroscopy. Sugar surfactants were generally superior to the other classes of surfactants for oil droplet encapsulation during freeze-drying, and there was the optimum alkyl chain length of the sugar surfactant. Sugar esters generally exhibited greater oil encapsulation than sugar ethers. Larger sugar head group appeared to result in better encapsulation in the case of sugar esters, but the opposite tendency was found for sugar ethers. A limited combination of sugar surfactants (15% sucrose mono- and 85% di-stearate) resulted in the maximum oil droplet encapsulation efficiency although these surfactants are individually quite poor in the encapsulation and other tested combinations did not improve the encapsulation efficiency relative to their individual effectiveness. (C) 2015 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.foodres.2015.02.003

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Effect of Lipid Amount on Surfactant-free Solid Lipid Nanoparticle Formation by Hot Homogenization Reviewed

    Jun Oshitani, Natsumi Murakami, Mikio Yoshida, Naoyuki Ishida, Koreyoshi Imamura, Hideki Ichikawa

    CHEMISTRY LETTERS   43 ( 7 )   1011 - 1013   2014.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CHEMICAL SOC JAPAN  

    The yield and size distribution of surfactant-free solid lipid nanoparticles (SF-SLNs) formed by hot homogenization were investigated by changing the amount of lipid (palmitic acid). The yield was 100% and monodispersed same-sized particles of 120-200 nm were formed at the lipid amount &lt;= 2.8 x 10(-4) g-lipid (g-water)(-1). The yield decreased owing to phase separation, and the size increased "step-likely" to be 200 350 nm while keeping the monodispersity when the lipid amount was just above &lt;= 2.8 x 10(-4) g-lipid (g-water)(-1). The size and the lipid amount continued to increase gradually at the lipid amount &gt;2.8 x 10(-4) g-lipid (g-water)(-1). The results indicate that submicron-sized solid lipid particles can be formed without surfactants and that the decrease of yield and the step-like increase of particle size occur at the same lipid amount. The total surface area of the SF-SLNs was estimated using the experimental data. It is suggested that the total surface area and the lipid amount are correlated to each other.

    DOI: 10.1246/cl.140279

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Characteristics of Sugar Surfactants in Stabilizing Proteins During Freeze-Thawing and Freeze-Drying Reviewed

    Koreyoshi Imamura, Katsuyuki Murai, Tamayo Korehisa, Noriyuki Shimizu, Ryo Yamahira, Tsutashi Matsuura, Hiroko Tada, Hiroyuki Imanaka, Naoyuki Ishida, Kazuhiro Nakanishi

    JOURNAL OF PHARMACEUTICAL SCIENCES   103 ( 6 )   1628 - 1637   2014.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

    Sugar surfactants with different alkyl chain lengths and sugar head groups were compared for their protein-stabilizing effect during freeze-thawing and freeze-drying. Six enzymes, different in terms of tolerance against inactivation because of freeze-thawing and freeze-drying, were used as model proteins. The enzyme activities that remained after freeze-thawing and freeze-drying in the presence of a sugar surfactant were measured for different types and concentrations of sugar surfactants. Sugar surfactants stabilized all of the tested enzymes both during freeze-thawing and freeze-drying, and a one or two order higher amount of added sugar surfactant was required for achieving protein stabilization during freeze-drying than for the cryoprotection. The comprehensive comparison showed that the C10-C12 esters of sucrose or trehalose were the most effective through the freeze-drying process: the remaining enzyme activities after freeze-thawing and freeze-drying increased at the sugar ester concentrations of 1-10 and 10-100 M, respectively, and increased to a greater extent than for the other surfactants at higher concentrations. Results also indicate that, when a decent amount of sugar was also added, the protein-stabilizing effect of a small amount of sugar ester through the freeze-drying process could be enhanced. (c) 2014 Wiley Periodicals, Inc. and the American Pharmacists Association J Pharm Sci

    DOI: 10.1002/jps.23988

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • pH Effect on Properties of Surfactant-free Oil-in-water Emulsion Prepared with Oleic Acid Reviewed

    Yuta Akizuki, Mikio Yoshida, Naoyuki Ishida, Toshiyuki Oshiki, Jun Oshitani

    CHEMISTRY LETTERS   43 ( 5 )   604 - 606   2014.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CHEMICAL SOC JAPAN  

    Size distribution, zeta potential, and yield of surfactant-free oil-in-water (O/W) emulsion prepared with oleic acid were measured at various pHs after seven days from the emulsification. We found that the size distribution is almost the same regardless of pH from 9 to 3. The magnitude of zeta potential and yield remains constant at pH from 9 to 6, and decreases at pH from 6 to 3. There is a correlation between the zeta potential and the yield, but no correlation between the zeta potential and the size, suggesting that the zeta potential relates to stability of oleic acid droplets in water rather than their size.

    DOI: 10.1246/cl.131209

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Effect of Surface Hydrophobicity on Short-Range Hydrophobic Attraction between Silanated Silica Surfaces Reviewed

    Soga Yuuhei, Imanaka Hiroyuki, Imamura Koreyoshi, Ishida Naoyuki

    Journal of the Society of Powder Technology, Japan   51 ( 5 )   343 - 348   2014

     More details

    Language:English   Publisher:一般社団法人 粉体工学会  

    The interaction forces between silanated silica surfaces with no nanobubbles were measured using colloidal probe atomic force microscopy (AFM). To obtain hydrophobic surfaces without nanobubbles, an aqueous solution was introduced between the surfaces following an exchange process involving several solvents. In the obtained approachingforce curves, an attractive force was observed from a distance of 10~20 nm, which is an additional attractive force stronger than typical van der Waals attractions. When the surface hydrophobicity decreased, the range of this attraction decreased slightly ; the attraction disappeared when the surface contact angle was below 90°。. In contrast, measurements in the water-ethanol mixtures revealed that the attraction persisted even when the contact angle was well below 90°。. The possible origin of this force was discussed on the basis of the obtained results.

    DOI: 10.4164/sptj.51.343

    CiNii Article

    CiNii Books

    researchmap

  • Effect of Modified Conditions on Adhesive Force between Propyl-modified Plates and Unmodified Silica Particle Reviewed

    吉田幹生, 日高弘喜, 石田尚之, 押谷潤, 後藤邦彰

    粉体工学会誌   51 ( 9 )   635-640 (J-STAGE)   2014

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.4164/sptj.51.635

    J-GLOBAL

    researchmap

  • Improving the physical stability of freeze-dried amorphous sugar matrices by compression at several hundreds MPa Reviewed

    Ryo Kagotani, Kohshi Kinugawa, Mayo Nomura, Hiroyuki Imanaka, Naoyuki Ishida, Koreyoshi Imamura

    JOURNAL OF PHARMACEUTICAL SCIENCES   102 ( 7 )   2187 - 2197   2013.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

    Amorphous matrices, composed of sugars, are markedly plasticized by moisture uptake, which results in physical instability. Our previous studies, in the compression pressure range 443 MPa, indicated that when a matrix is compressed, the amount of sorbed water at given relative humidities (RHs) decreases, whereas the glass transition temperature (Tg) remains constant. Herein, the effect of higher compression pressures than those used previously was explored to investigate the feasibility of using compression to improve the physical stability of amorphous sugar matrix against water uptake and subsequent collapse. Amorphous sugar samples were prepared by freeze-drying and then compressed at 0-665 MPa, followed by rehumidification at given RHs. The physical stability of the amorphous sugar sample was evaluated by measuring Tg and crystallization temperature (Tcry). The amounts of sorbed water, different in the interaction state, were determined using an FTIR technique. It was found that the compression at pressures of 443 MPa decreased the amount of sorbed water, which is a major factor in plasticization and crystallization, and thus markedly increased the Tg and Tcry relative to that for the uncompressed sample. Hence, the compression at several hundreds MPa appears to be feasible for improving the physical stability of amorphous sugar matrix. (c) 2013 Wiley Periodicals, Inc. and the American Pharmacists Association J Pharm Sci 102:2187-2197, 2013

    DOI: 10.1002/jps.23568

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Characteristics of amorphous matrices composed of different types of sugars in encapsulating emulsion oil droplets during freeze-drying Reviewed

    Koreyoshi Imamura, Yoshifumi Kimura, Shota Nakayama, Miki Sayuri, Seiji Ogawa, Tatsuya Hoshino, Jun Oshitani, Takashi Kobayashi, Shuji Adachi, Tsutashi Matsuura, Hiroyuki Imanaka, Naoyuki Ishida, Kazuhiro Nakanishi

    FOOD RESEARCH INTERNATIONAL   51 ( 1 )   201 - 207   2013.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    The encapsulation of emulsion oil droplets by amorphous sugar matrices, formed by freeze-drying, was investigated, with a focus on the influence of the type of sugar. An oil-in-water emulsion, comprised of linoleic acid methyl ester (LME) and sucrose monolaurate (SML) as an oil phase and surfactant, respectively, were freeze-dried in the presence of different types of sugars. LME-droplet encapsulation during and after freeze-drying were evaluated by FTIR analysis. The loss of LME largely occurred in the early stage of freeze-drying. The size distribution of the encapsulated LME droplets remained unchanged before and after freeze-drying in most cases. The encapsulated fractions of LME droplets could be correlated with the glass transition temperature of the sugars in the fully hydrated state (T-g*), and the existence of an optimum T-g* value for the sugar matrix was predicted. The encapsulation ability of an amorphous sugar matrix was maximized when mono- and polysaccharide were combined so as to give a value for T-g* of approximately -50 degrees C, although, individually, mono- and polysaccharides were quite poor for oil droplet encapsulation. These findings suggest that the structural flexibility of the amorphous sugar matrix is a major determinant in oil droplet encapsulation by an amorphous sugar matrix during freeze-drying. (C) 2012 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.foodres.2012.12.010

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Role of interfacial interactions in ordering of two-dimensional colloidal self-assemblies on polyelectrolyte multilayer surfaces Reviewed

    Yasuyuki Kusaka, Naoyuki Ishida, Hirobumi Ushijima

    SOFT MATTER   9 ( 11 )   3155 - 3163   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    In this study, we examined the ordering of 2D colloidal particle monolayer structures formed atop polyelectrolyte multilayers (PEM) constructed by layer-by-layer deposition. We focused on the interactions between the particles and the substrate surface by changing the top layer of PEMs, along with the fabrication procedure for the PEMs. For PEMs prepared by rinsing with pure water in the fabrication process, the 2D assembly of negatively charged colloidal spheres exhibited a disordered state for positively charged PEM surfaces, whereas a well-ordered structure was formed on a negatively charged surface. Investigations with a colloid-probe atomic force microscope technique revealed that the friction force between the colloid and substrate at a zero load condition strongly affects the ordering state of the particle monolayers for relatively rigid surfaces. However, swollen PEM surfaces that were prepared by rinsing the layers with a salt solution rendered disordering of the colloidal monolayer for both positively and negatively charged surfaces and shifted to a less ordered state as the number of polyelectrolyte layers increased. For the salt-rinsed PEMs, we found that the range of the steric force of the PEMs rather than the friction force appears to be critical for the ordering of the 2D colloidal assemblies. For such swollen PEMs, we consider that the entanglement of the polymers to the colloidal particles invokes the hindrance of the particle ordering in the 2D colloidal assembly formation even though electrostatic repulsion between the colloids and the polymer layer takes place.

    DOI: 10.1039/c2sm27486h

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Water-in-oil Microemulsion Formation with Aqueous C-n-TAB Solution and H-AOT/Isooctane Solution Reviewed

    Jun Oshitani, Yuichi Baba, Shiho Takashina, Mikio Yoshida, Naoyuki Ishida

    CHEMISTRY LETTERS   41 ( 10 )   1072 - 1074   2012.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CHEMICAL SOC JAPAN  

    Aqueous C-n-TAB (n = 8, 10, and 12; octyl-, decyl-, and dodecyltrimethylammonium bromide) solution and isooctane solution of H-AOT (hydrogen bis(2-ethylhexyl) sulfosuccinate) were mixed using a vortex mixer to produce a water-in-oil (W/O) microemulsion. The microemulsion was formed with the critical amount of C-n-TAB; the order of the critical amount was C-12-TAB &lt; C-10-TAB &lt; C-8-TAB. A possible cause for the microemulsion formation was proposed based on the screening of the electrostatic repulsion between negatively charged AOT's polar headgroups by the positively charged C-n-TAB's polar headgroups, the hydrophobic interaction between hydrocarbon chains, and hydrated water around AOT's polar headgroup.

    DOI: 10.1246/cl.2012.1072

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Hydrophobic Attraction between Silanated Silica Surfaces in the Absence of Bridging Bubbles Reviewed

    Naoyuki Ishida, Yasuyuki Kusaka, Hirobumi Ushijima

    LANGMUIR   28 ( 39 )   13952 - 13959   2012.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    The interaction forces between silanated silica surfaces on which there were neither nanobubbles nor a gas phase were measured using colloidal probe atomic force microscopy (AFM). To obtain hydrophobic surfaces without attached nanobubbles, an aqueous solution was introduced between the surfaces after an exchange process involving several solvents. In the approaching force curves obtained, an attractive force was observed from a distance of 10-25 nm, indicating the existence of an additional attractive force stronger than the van der Waals attraction. In the retracting force curves, a strong adhesion force was observed, and the value of this force was comparable to that of the capillary bridging force. The data clearly showed that although the bridging of nanobubbles is responsible for long-range hydrophobic attraction, there also exists an additional attractive force larger than the van der Waals attraction between hydrophobic surfaces without nanobubbles. Both the ionic strength and the temperature of the solution had little influence on the force. The possible origin of the force is discussed on the basis of the obtained results.

    DOI: 10.1021/la303037d

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Effect of Electrolyte and Alcohol in Solution on the Hydrophobic Attraction between Alkoxylated Silica Surfaces Reviewed

    Naoyuki Ishida, Yasuyuki Kusaka, Hirobumi Ushijima

    CHEMISTRY LETTERS   41 ( 10 )   1273 - 1275   2012.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CHEMICAL SOC JAPAN  

    The interaction forces between silica surfaces when nanobubbles were removed from the surfaces were measured using an atomic force microscope. In the approaching force curves between the hydrophobic surfaces, an attractive force was observed from a distance of 10-20 nm. The electrolyte concentration had little effect on the range and strength of the interaction, whereas the addition of even a small amount of ethanol dramatically reduced the range of the interaction.

    DOI: 10.1246/cl.2012.1273

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Analysis of Adsorption and Binding Behaviors of Silver Nanoparticles onto a Pyridyl-Terminated Surface Using XPS and AFM Reviewed

    Nobuko Fukuda, Naoyuki Ishida, Kenichi Nomura, Tong Wang, Kaoru Tamada, Hirobumi Ushijima

    LANGMUIR   27 ( 21 )   12916 - 12922   2011.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    In this study, we analyzed adsorption and binding behaviors of citrate-capped silver nanoparticles (AgNPs) on a pyridyl-terminated surface using X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Adsorption of the AgNPs onto the pyridyl-terminated silicon wafer surface was completed through pH-controlled sol immersion. The adsorption occurred predominantly at a pH less than the pK(b) value of the pyridyl group and more than the pK(a1) of citric acid, indicating that the driving force behind adsorption was electrostatic interaction. Adsorption of citrate onto the pyridyl group also occurred at pK(al) &lt; pH &lt; pK(b) without AgNPs. According to XPS in the N1s region, larger deprotonation from the pyridinium-formed pyridyl groups was demonstrated subsequent to adsorption of the AgNPs. The deprotonation from the pyridinium indicates the formation of the neutral pyridyl group as the counterpart of hydrogen bonding with the carboxyl group of citrate. The binding state between the pyridyl group and citrate surrounding AgNPs is expected to be kept stable through hydrogen bonding and van der Waals force derived from the AgNPs approach to the pyridyl surface.

    DOI: 10.1021/la2032785

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • A New Method of 'Solid Inking' and Its Application to Direct Patterning of InAs Nanowire Using Dip-Pen Nanolithography Reviewed

    Tong Wang, Yoshiki Shimizu, Naoyuki Ishida, Hirobumi Ushijima

    IEICE TRANSACTIONS ON ELECTRONICS   E94C ( 2 )   146 - 150   2011.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    We report a new approach to creating a 'solid ink' and direct patterning of In As nanowires on a Si substrate using dip-pen nano-lithography (DPN). The normal method to prepare an 'ink' is a solution-based process using sonication to liquidize nanoparticles, which we call 'liquid ink' in this paper. As ink-solution-based DPN patterning has been prevalent in most studies, herein we propose a new method, 'solid inking', by which the inking process is solution-free. In our work, In As nanowires were transferred to an AFM tip by directly scanning the tip over an In As nanowire wafer at humidity over 80%. By this method, the preparation of ink and the 'inking' process is combined into one step, and a large amount of nanowires can be collected onto the tip to ensure the formation of a continuous ink flow for the direct patterning.

    DOI: 10.1587/transele.E94.C.146

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • The size of particle aggregates produced by flocculation with PNIPAM, as a function of temperature Reviewed

    Elizaveta Burdukova, Naoyuki Ishida, Timothy Shaddick, George V. Franks

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   354 ( 1 )   82 - 88   2011.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS INC ELSEVIER SCIENCE  

    This work investigates the effect of temperature on the size of alumina aggregates formed by flocculation with temperature responsive Poly(N-Isopropylacrylamide)(PNIPAM). The results are discussed in terms of the effects of temperature on particle collision, particle adhesion and aggregate breakage. It was found that the size of alumina aggregates increases with increasing solution temperature. Particle/particle collision and aggregate breakage are largely unaffected by increasing solution temperature and therefore could not account for the change in aggregate size. The dominant factor in aggregate growth with increasing temperature was found to be the increase in the force of adhesion between alumina particles. The appearance of the adhesive force is triggered by the increase in temperature above the lower critical solution temperature of PNIPAM. (C) 2010 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.jcis.2010.10.016

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Surface characterization of nanoparticles carrying pH-responsive polymer hair Reviewed

    Syuji Fujii, Motomichi Suzaki, Yoshinobu Nakamura, Kenichi Sakai, Naoyuki Ishida, Simon Biggs

    POLYMER   51 ( 26 )   6240 - 6247   2010.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCI LTD  

    The surface of near-monodisperse colloidal polystyrene (PS) latex particles carrying pH-responsive poly [2-(diethylamino)ethyl methacrylate] (PDEA) polymer chains as a steric stabilizer has been extensively characterized in dry and wet states. X-ray photoelectron spectroscopy and contact angle measurement studies confirm that PDEA chains are located on the PS latex particle surface. Transmission electron microscopy (TEM) studies reveal that the sterically stabilized PS particles have a core-shell morphology and wet atomic force microscopy data confirm that the pH-responsive PDEA component covers the PS latex core and the thickness of the protonated steric polymer is estimated to be approximately 15 nm. The PS latex particles can be easily dispersed in acidic aqueous media (pH 3.0) whilst they flocculate in basic aqueous media (pH 10.0) due to the pH-responsive PDEA hair. This dispersion-flocculation cycle of the PS latex is fully reversible. (C) 2010 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.polymer.2010.10.041

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Effect of Grafting Density on Phase Transition Behavior for Poly(N-isopropylacryamide) Brushes in Aqueous Solutions Studied by AFM and QCM-D Reviewed

    Naoyuki Ishida, Simon Biggs

    MACROMOLECULES   43 ( 17 )   7269 - 7276   2010.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    The effect of grafting density on the phase transition behavior of poly(N-isopropylacrylamide) (PNIPAM) grafted onto a flat substrate was investigated using an atomic force microscope (AFM) and a quartz crystal microbalance (QCM-D). We prepared PNIPAM brush layers at three different grafting densities on silicon wafers using a "grafting from" atom transfer radical polymerization (ATRP) approach. AFM imaging in water at various temperatures showed that the transition behavior of the grafted PNIPAM chains from a brush-like to a mushroom-like morphology was dependent on the grafting density: the images change abruptly from essentially featureless to domain structures across the LCST for the low-density surface, whereas the change in the images becomes less abrupt with increasing polymer graft density. The QCM-D data also indicated a significant dependence of the layer properties on the grafting density, confirming the behavior differences suggested by the A FM images. In particular, the dissipation data strongly suggest that the magnitude of lateral aggregation for the PNIPAM chains depends on the grafting density. A similar effect of grafting density was also observed for the phase transition as a function of salt concentration in sodium sulfate solutions.

    DOI: 10.1021/ma101113g

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Temperature controlled surface hydrophobicity and interaction forces induced by poly (N-isopropylacrylamide) Reviewed

    Elizaveta Burdukova, Haihong Li, Naoyuki Ishida, John-Paul O&apos;Shea, George V. Franks

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   342 ( 2 )   586 - 592   2010.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS INC ELSEVIER SCIENCE  

    Poly (N-isopropylacrylamide) (PNIPAM) is a temperature responsive polymer. At temperature below its lower critical Solution temperature (LCST 32 degrees C) PNIPAM is soluble in water and hydrophilic. At temperature above the LCST, the polymer becomes hydrophobic and insoluble in water. At temperatures above the LCST, PNIPAM has been shown to induce flotation of previously hydrophilic minerals. The mechanism is believed to be an increase in particle hydrophobicity when PNIPAM adsorbs to the particle surfaces at high temperature. This paper investigates the interaction forces between bare silica surfaces in PNIPAM solutions. The influence of three phase contact angles on these interactions, in the presence of polymers of different molecular weights, is also examined. It was found that the presence of PNIPAM on silica Surfaces significantly increases their hydrophobicity at a temperature above the LCST. The AFM measurements Of Surface forces at high temperature also showed that strong adhesion is present between the PNIPAM coated surfaces, which is absent in the absence of polymer. These findings lead to the conclusion that the detected attractive force and subsequent adhesion result from hydrophobic attraction induced by PNIPAM at temperature above the LCST. (C) 2009 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.jcis.2009.10.049

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Mechanism responsible for flocculation in poly (n-isopropylacrylamide) temperature responsive dewatering-attractive interaction forces induced by surface hydrophobicity Reviewed

    Franks G, Burdukova E, Li H, Ishida N, O{'}Shea J.-P

    XXV International Mineral Processing Congress 2010, IMPC 2010   5   4057 - 4067   2010

  • Characterizing the structural transition of cationic DPPC liposomes from the approach of TEM, SAXS and AFM measurements Reviewed

    Kenichi Sakai, Hideki Tomizawa, Koji Tsuchiya, Naoyuki Ishida, Hideki Sakai, Masahiko Abe

    COLLOIDS AND SURFACES B-BIOINTERFACES   67 ( 1 )   73 - 78   2008.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    The structural transition of L-alpha-dipalmitoylphosphatidylcholine (DPPC) liposomes, caused by the addition of a small amount of stearylamine (SA), has been characterized. It has been reported that the shape of DPPC liposomes changes from multilamellar vesicles to large-unilamellar vesicles at the molar concentration ratio of DPPC/SA = 9.5/0.5, however, the possible diving factors for this phenomenon have not so far been presented. Flat lipid membranes consisting of DPPC and SA, prepared by the quasi-Bangham method or the Langmuir-Blodgett (LB) technique, are employed in this study when considering the molecular interaction in and between lipid membranes, which should play a key role for determining the liposome shape. The colloid probe atomic force microscopy reveals that the addition of SA results in an inter-film electrosteric repulsion. This repulsive interaction causes a significant increase in the inter-film distance, which is confirmed with freeze-fracture transmission electron microscopy (FF-TEM) and small-angle X-ray scattering (SAXS), and thereby, the large-unilamellar vesicles are formed for reducing the inter- and intra-firm repulsive forces. Taking the molecular structures into consideration, it seems that the shape transition of DPPC liposomes results from such electrostatic interactions as well as packing geometry of the two components. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.colsurfb.2008.07.017

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Salt-induced structural behavior for poly(N-isopropylacryamide) grafted onto solid surface observed directly by AFM and QCM-D Reviewed

    Naoyuki Ishida, Simon Biggs

    MACROMOLECULES   40 ( 25 )   9045 - 9052   2007.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    The salt-induced structural changes of an end-grafted poly(N-isopropylacrylamide) (PNIPAM) layer on a silica substrate were investigated in sodium sulfate solutions using an atomic force microscope (AFM) and a quartz crystal microbalance with dissipation (QCM-D). A PNIPAM layer was grafted onto the silicon wafer surface by free radical polymerization of NIPAM to obtain a high molecular weight polymer layer with low grafting density overall. AFM images of the coated surface were featureless at low salt concentrations commensurate with a brush-like layer. At salt concentrations &gt;= 0.11 M, a large number of domain structures, with a characteristic size of similar to 100 nm, were seen on the surface commensurate with a collapse of the brush-like layer into mushroom-like aggregates. This critical concentration for brush collapse is in good agreement with the concentration range of between 0.1 and 0.2 M, at which the phase transition of the bulk PNIPAM is reported. Both the frequency and the dissipation data obtained using a QCM-D also showed a significant change at this concentration indicative of the layer collapse. Further analysis of these data confirmed that the observed PNIPAM structural transition was caused by a collapse of the brush-like structure as a result of dehydration of the polymer chains.

    DOI: 10.1021/ma071878e

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Interaction forces between a poly(N-isopropylacryamide) layer grafted onto a solid surface and a hydrophobic particle Reviewed

    Naoyuki Ishida

    ADVANCED POWDER TECHNOLOGY   18 ( 6 )   631 - 642   2007.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:BRILL ACADEMIC PUBLISHERS  

    The interaction forces between poly(N-isopropylacrylamide) (PNIPAAm)-grafted surfaces and colloidal particles in an aqueous solution were investigated using atomic force microscopy. The measurements were conducted between a smooth silicon wafer on which PNIPAAm was terminally grafted and silica particles hydrophobized with a silanating reagent in an aqueous electrolyte solution under controlled temperature. Large repulsive forces were observed between the surfaces below the lower critical solution temperature (LCST) of PNIPAAm, while attractive forces were observed above the LCST. The magnitude of the attractive force tended to increase with the surface hydrophobicity of the particles. The temperature-induced changes in the hydration state of the grafted PNIPAAm chains are considered to greatly alter the interaction force properties. The role of the intermolecular interaction between the PNIPAAm chains and hydrophobic particles in the interaction forces is discussed.

    DOI: 10.1163/156855207782515102

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Direct observation of the phase transition for a Poly(N-isopropylacryamide) layer grafted onto a solid surface by AFM and QCM-D Reviewed

    Naoyuki Ishida, Simon Biggs

    LANGMUIR   23 ( 22 )   11083 - 11088   2007.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    The temperature-induced structural changes of a thermo-responsive poly(N-isopropylacrylamide) (PNIPAM) layer grafted onto a silica substrate were investigated in aqueous solution using an atomic force microscope (AFM) and a quartz crystal microbalance with dissipation (QCM-D). A PNIPAM layer was grafted onto the silicon wafer surface by free radical polymerization of NIPAM to obtain a high molecular weight polymer layer with low-grafting density overall. By AFM imaging, the transition of the grafted PNIPAM chains from a brush-like to a mushroom-like state was clearly visualized: The surface images of the plate were featureless at temperatures below the LCST commensurate with a brush-like layer, whereas above the LCST, a large number of domain structures with a characteristic size of similar to 100 nm were seen on the surface. Both frequency and dissipation data obtained using QCM-D showed a significant change at the LCST. Analysis of these data confirmed that the observed PNIPAM structural transition was caused by a collapse of the brush-like structure as a result of dehydration of the polymer chains.

    DOI: 10.1021/la701461b

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Direct measurement of hydrophobic particle-bubble interactions in aqueous solutions by atomic force microscopy: Effect of particle hydrophobicity Reviewed

    Naoyuki Ishida

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   300 ( 3 )   293 - 299   2007.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Direct measurements of the interaction forces between a spherical silica particle and a small air bubble have been conducted in aqueous electrolyte solutions by using an atomic force microscope (AFM). The silica particle was hydrophobized with a silanating reagent, and the interaction forces were measured by using several particles with different surface hydrophobicities. In the measured force curves, a repulsive force was observed at large separation distances as the particle moved towards the bubble. The origin of the repulsive force was attributed to an electrostatic double-layer force because both the particle and bubble were negatively charged. After the repulsive force, an extremely long-range attractive force acted between the surfaces. These results indicate that the intervening thin water film between the particle and bubble rapidly collapsed, resulting in the particle penetrating the bubble.
    The instability of the thin water film between the surfaces suggests the existence of an additional attractive force. By comparing the repulsive forces of the obtained force curves with the DLVO theory, the rupture thickness was estimated. The hydrophobicity of the particle did not significantly change the rupture thickness, whereas the pH of the solution is considered to be a critical factor. (C) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.colsurfa.2007.02.003

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Interaction forces between chemically modified hydrophobic surfaces evaluated by AFM - The role of nanoscopic bubbles in the interactions Reviewed

    N Ishida, K Higashitani

    MINERALS ENGINEERING   19 ( 6-8 )   719 - 725   2006.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    The interaction forces between a hydrophobic silicon plate and a silica particle in an aqueous solution were investigated with an atomic force microscope (AFM). The surfaces were hydrophobized chemically by a silane coupling agent, and the hydrophobicity (contact angle theta) of the surfaces was varied. The interactions were long-ranged at theta &gt; 90 degrees with a discontinuous step appearing in the approaching and separating force curves respectively. The range and magnitude of the interaction were decreased with decreasing theta. On the other hand. the interactions at theta = 80 degrees was unstable and no long-range attraction was observed. When the gas phase on the surfaces was removed by flushing organic solvents between the surfaces, the interactions became short-ranged at theta &gt; 90 degrees, and the interaction was described DLVO theory at large distances at theta = 80 degrees. A large number of nano-size domain structures were found on the surfaces by tapping-mode AFM. These results imply that the bridging of nanobubbles is the main origin of the long-range force between chemically hydrophobized surfaces and that the size of the bubble has critical effect on the range and magnitude of the attractive force. The short-range interactions without bubbles were found to consist of an electrostatic repulsive force at larger distances and an attractive force, which was sufficiently longer-ranged than the van der Waals force, at smaller distance. (C) 2005 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.mineng.2005.09.023

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Interaction forces measured between poly(N-isopropylacrylamide) grafted surface and hydrophobic particle Reviewed

    N Ishida, M Kobayashi

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   297 ( 2 )   513 - 519   2006.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS INC ELSEVIER SCIENCE  

    The interaction forces between poly(N-isopropylacrylamide) (PNIPAAm)-grafted surfaces and colloidal particles in an aqueous solution were investigated using an atomic force microscope. Measurements were conducted between smooth silicon wafers on which PNIPAAm was terminally grafted and silica particles hydrophobized with a silanating reagent in an aqueous electrolyte solution under controlled temperature. Below the lower critical solution temperature (LCST) of PNIPAAm, there were large repulsive forces between the surfaces, both on approach and separation of the surfaces. On the other hand, above LCST, attractive forces were observed both in approaching and in separating force curves. When surface hydrophobicity of the particles increased, the maximum attractive force tended to increase. The changes of hydration state of the grafted PNIPAAm chains depending on temperature are considered to greatly alter the interaction force properties. The role of the intermolecular interaction between the PNIPAAm chains and the hydrophobic particles in the interaction forces is discussed. (c) 2005 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.jcis.2005.10.068

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Interaction forces between thermoresponsive surface and colloidal particle in aqueous solution studied using atomic force microscopy Reviewed

    Ishida N, Kobayashi M

    Materials Research Society Symposium Proceedings   942   21 - 27   2006

     More details

    Publishing type:Research paper (international conference proceedings)  

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Capillary forces between planar anchoring surfaces in the isotropic phase of a nematic liquid crystal Reviewed

    Hiroyuki Shinto, Kiwamu Kobayashi, Terumasa Hyodo, Naoyuki Ishida, Ko Higashitani

    Chemistry Letters   34 ( 10 )   1318 - 1319   2005.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    The interaction forces between the planar anchoring surfaces of a carbon microsphere and a graphite plate immersed in 8CB liquid crystal have been measured at different temperatures above the nematic-isotropic transition point, using an atomic force microscopy. The attractive force was observed between the surfaces when they came closer. The magnitude and the range of the attractive force increased with decreasing temperature. This attractive force is attributable to the confinement-induced phase separation of 8CB. Copyright © 2005 The Chemical Society of Japan.

    DOI: 10.1246/cl.2005.1318

    Scopus

    researchmap

  • Interaction forces between hydrophobic surfaces evaluated by AFM - The role of nanoscopic bubbles in the interactions Reviewed

    Ishida N, Higashitani K

    Australasian Institute of Mining and Metallurgy Publication Series   481 - 486   2005

  • Direct Measurements of The Interaction Force between Particle and Bubble in Aqueous Surfactant Solutions Reviewed

    ISHIDA Naoyuki, YOTSUMOTO Hiroki

    Shigen-to-Sozai   120 ( 6 )   400 - 405   2004.7

     More details

    Language:Japanese   Publisher:一般社団法人 資源・素材学会  

    In many industrial processes, surfactants are used to control the dispersion and coagulation of particles in aqueous solutions. Especially, surfactants have critical effects in flotation separation. To investigate the effects of surfactants to the surface force between bubble and particle, which is critical for the particle recovery in flotation, we conducted direct measurements of the interaction forces between a spherical silica particle and an air bubble in dodecylamine hydrochloride (DAH) solution using atomic force microscope. Interaction forces were measured between the particle attached on the top of AFM probe and bubble generated on the flat surface.&lt;BR&gt;When a hydrophilic silica particle was used, electrostatic force was observed at large separation distance on approach of the silica and the bubble. Then long-range attractive force acted between the surfaces even when DAH concentration was low. The range of attractive force includes the penetration distance of particle into the bubble. The relation between the floatability of silica particle in batch column flotation and the interaction force was discussed.&lt;BR&gt;On the other hand, when the hydrophobized silica was used, the range of attractive force became short with the increase of DAH concentration. The repulsive force before attraction became very strong at high DAH concentration. The origin of the strong repulsive force is assumed to be the steric force between adsorbed dodecylammonium ions. These interaction forces cause the depression of the particle in flotation.

    DOI: 10.2473/shigentosozai.120.400

    CiNii Article

    CiNii Books

    researchmap

  • Direct Measurement of Interaction Forces between Solid Particle and Bubble in Aqueous Solutions by Atomic Force Microscopy Reviewed

    ISHIDA Naoyuki, YOTSUMOTO Hiroki

    Shigen-to-Sozai   120 ( 6 )   395 - 399   2004.7

     More details

    Language:Japanese   Publisher:一般社団法人 資源・素材学会  

    Interaction forces between a bubble and a particle are critical for various industrial processes that handle colloidal dispersions, especially for froth flotation. Therefore, it is fundamentally important to understand the surface force between a bubble and a particle to control froth flotation process effectively. In this study, we conducted direct measurements of interaction forces between a spherical solid particle (silica and iron oxide) and a small air bubble in aqueous electrolyte using atomic force microscope (AFM). Interaction forces were measured between the particle attached on the top of AFM probe and air bubble generated on the flat surface. The forces between the silica and the bubble were repulsive over the wide range of the conditions of present experiments. The origin of the force was considered to be electrostatic force. In the case of iron oxide-air bubble system, the interaction forces were attractive when the pH was lower than isoelectric point (iep) of the ion oxide, while the forces were repulsive when the pH exceeded the iep. The attractive forces were stronger and longer-ranged than the force predicted by heterocoagulation theory. It was found that these interaction forces could explain batch column flotation results with nitrogen gas bubbles qualitatively.

    DOI: 10.2473/shigentosozai.120.395

    CiNii Article

    CiNii Books

    researchmap

  • Optical observation of gas bridging between hydrophobic surfaces in water Reviewed

    N Ishida, M Sakamoto, M Miyahara, K Higashitani

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   253 ( 1 )   112 - 116   2002.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS INC ELSEVIER SCIENCE  

    The very strong and long-ranged interaction force between hydrophobic surfaces in water has been a debated issue for a long time. Recent studies suggest that the long-range attraction is attributable to the bridging of nanoscopic bubbles attached on the surfaces. However, it is still unclear at present whether such a bridging is able to exit stably or not. To clarify the existence of the gas bridge, we conducted the optical observation and the force measurement between the hydrophobic glass particle and plate in water simultaneously, using a combined apparatus of an atomic force microscope and an optical inverted microscope. It is found that (i) the image of the dark ring of ca. 1 mum in diameter appears in the region where the existence of the bridge is confirmed by force curves, but disappears when the separation between surfaces becomes shorter than the low limit of the wavelength of visible light, and (ii) the sudden disappearance of the image coincides well with the breakage of the bridge estimated from the separating force curve. The results obtained here are consistent with the above-mentioned mechanism for the long-range attraction between hydropobic surfaces in water. (C) 2002 Elsevier Science (USA).

    DOI: 10.1006/jcis.2002.8444

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Static method to evaluate interaction forces by AFM Reviewed

    N Ishida, M Sakamoto, M Miyahara, K Higashitani

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   235 ( 1 )   190 - 193   2001.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS INC  

    An atomic force microscope (AFM) is a very powerful tool to evaluate interaction forces between surfaces in liquids on the molecular scale, but the apparatus was not designed to measure forces in equilibrium. Hence, data obtained by AFM are not in equilibrium in principle. Here we propose a static method to obtain interaction forces between stationary surfaces in aqueous solutions using AFM. The validity of the proposed method was confirmed by comparing interaction forces measured by this method with those by the normal dynamic method for the system of a mica plate and a silica particle in electrolyte solutions where an equilibrium was nearly achieved because water molecules and ions moved much faster than surfaces, The applicability of this method to the measurement of hydrophobic attraction was then examined, and important information on the attraction was obtained. (C) 2001 Academic Press.

    DOI: 10.1006/jcis.2000.7212

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Nano bubbles on a hydrophobic surface in water observed by tapping-mode atomic force microscopy Reviewed

    N Ishida, T Inoue, M Miyahara, K Higashitani

    LANGMUIR   16 ( 16 )   6377 - 6380   2000.8

     More details

    Language:English   Publisher:AMER CHEMICAL SOC  

    The silicon wafer hydrophobized with OTS was immersed into water to observe the surface in-situ by tapping-mode AFM. A large number of nano-size domain images:were found on the surface. Their shapes were characterized by the height image procedure of AFM, and the differences of the properties compared to those of the bare surface were analyzed using the phase image procedure and the interaction force curves. All the results consistently implied that the domains represent the nanoscopic bubbles attached on the surface. This was confirmed by the fact that no domain was observed in the case of the surfaces hydrophobized in the AFM fluid cell without exposure to air. The apparent contact angle of the bubbles was much smaller than that expected macroscopically, which was postulated to be the reason bubbles were able to sit stably on the surface.

    DOI: 10.1021/la000219r

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Attraction between hydrophobic surfaces with and without gas phase Reviewed

    N Ishida, M Sakamoto, M Miyahara, K Higashitani

    LANGMUIR   16 ( 13 )   5681 - 5687   2000.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    To clarify the origin of the long-range attraction between hydrophobic surfaces in water, the interaction between the surfaces silanated by the popular method (type I) and that between the surfaces silanated without exposing to air (type II) were: examined using an atomic force microscope (AFM) and their characteristics were compared. The interaction between type I surfaces was long-ranged, and a discontinuous step appeared in the approaching and separating force curves, respectively, whereas the interaction between type II surfaces was short-ranged and no step was found. Once type II surfaces were exposed to air, however, the similar interaction to that for type I surfaces appeared. As for type I surfaces, the force curves depended on the local property of the surface, and the interaction in the first cycle of force measurements differed from those in the later cycles. These findings enabled us to estimate the following mechanism for the long-range attraction. When surfaces are hydrophobized, they are usually exposed to air during the hydrophobizing reaction or in the drying process. Then they are immersed in water to measure the interaction without removing microscopic bubbles on the surfaces completely. These bubbles coalesce before the surfaces contact and generate a strong long-range interaction. Hence, this interaction is not the genuine hydrophobic attraction.

    DOI: 10.1021/la991146i

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Effects of hydrophobizing methods of surfaces on the interaction in aqueous solutions Reviewed

    N Ishida, N Kinoshita, M Miyahara, K Higashitani

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   216 ( 2 )   387 - 393   1999.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS INC  

    The hydrophobic interaction between the surfaces hydrophobized by the adsorption of STAC in a STAC solution (system I) and the interaction between the surfaces hydrophobized by the reaction with OTS in water (system II) were investigated using an atomic force microscope, and their difference was compared. Clear differences of the interaction between systems I and II were found with respect to the force curves and the morphology of the surfactants adsorbed on the surfaces. It is postulated that the hydrophobic interaction for system II is attributable to the cavity bridging between the surfaces, but that for system I it is originated from a different mechanism. It is also implied that the existence of the surfactants in the bulk will play an important role for the hydrophobic interaction, (C) 1999 Academic Press.

    DOI: 10.1006/jcis.1999.6329

    Web of Science

    Scopus

    researchmap

    Other Link: http://orcid.org/0000-0001-7603-1151

  • Adsorption of Inorganic Depressants on Synthesized Diamond and Graphite

    ISHIDA Naoyuki, MWAIPOPO Danford, KUSAKA Eishi, NIINAE Masakazu, FUKUNAKA Yasuhiro, NAKAHIRO Yoshitaka

    Journal of the Mining and Materials Processing Institute of Japan   113 ( 4 )   p.269 - 273   1997.4

     More details

    Language:Japanese   Publisher:資源・素材学会  

    DOI: 10.2473/shigentosozai.113.269

    CiNii Article

    CiNii Books

    researchmap

  • Study on Recycling of Rare Earth Magnet Scrap.

    NIINAE Masakazu, YAMAGUCHI Kiyoto, ISHIDA Naoyuki, DJOHARI Akskadi, NAKAHIRO Yoshitaka, WAKAMATSU Takahide

    Shigen-to-Sozai   110 ( 12 )   981 - 986   1994

     More details

    Language:Japanese   Publisher:一般社団法人 資源・素材学会  

    The rare earth magnet has a good performance, and the production is increasing year by year. Two types of rare earth magnets are presently made as industrial products. One is a Nd-Fe-B intermetallic compound magnet and the other is a Sm-Co alloy magnet.&lt;BR&gt;Mixed scraps of Nd-Fe-B intermetallic compound and Sm-Co alloy are sometimes produced in the step of production. Therefore, it is desired that the recycling system of mixed rare earth magnet scraps shall be established.&lt;BR&gt;In the present study, the extraction and separation of Nd and Sm by solvent extraction is mainly tested to obtain the fundamental data for the hydrometallurgical treatment of the mixed rare earth magnet scraps. The results obtained in this study are summarized as follows:&lt;BR&gt;(1) The separation efficiency of Nd and Sm from hydrochloric acid solutions is better than that from sulphuric acid solutions.&lt;BR&gt;(2) The extractant combinations, EHPNA/ TOPO and EHPNA/TOA are favourable to the extraction and separation of Nd and Sm, compared with other extractants tested in this study.&lt;BR&gt;(3) The hydrometallurgical process of mixed rare earth magnet scraps based on oxidizing roasting, hydrochloric acid leaching, and solvent extraction is proposed.

    DOI: 10.2473/shigentosozai.110.981

    CiNii Article

    researchmap

▼display all

MISC

  • Fundamentals of Powder Technology, 2nd Edition(1)Particle Characteristics and Measurement(9)Interparticle Forces(4)Measurement Methods of Interparticle Forces

    石田 尚之

    粉体工学会誌 = Journal of the Society of Powder Technology, Japan   55 ( 10 )   542 - 546   2018

     More details

    Language:Japanese   Publisher:粉体工学会  

    CiNii Article

    researchmap

  • 1. Particle characteristics and measurement 1.9 interparticle forces 1.9.3 effects of surface deformation, geometry and roughness on forces

    Naoyuki Ishida, Shuji Matsusaka

    Journal of the Society of Powder Technology, Japan   55 ( 4 )   208 - 211   2018

     More details

    Language:Japanese   Publisher:Society of Powder Technology  

    DOI: 10.4164/sptj.55.208

    Scopus

    CiNii Article

    researchmap

  • 1. Particle characteristics and measurement 1.9 interparticle forces 1.9.2 interactions in liquids

    Naoyuki Ishida, Shuji Matsusaka

    Journal of the Society of Powder Technology, Japan   55 ( 2 )   104 - 112   2018

     More details

    Language:Japanese   Publisher:Society of Powder Technology  

    DOI: 10.4164/sptj.55.104

    Scopus

    CiNii Article

    researchmap

  • Rapid Synthesis Method of Pigments for Scientific Educational Activities

    米田 美佳, 石田 尚之, 寺西 貴志, 中西 真

    Ceramics Japan   52 ( 11 )   759 - 763   2017.11

     More details

    Language:Japanese   Publisher:日本セラミックス協会  

    CiNii Article

    researchmap

  • Fundamentals of Powder Technology, 2nd Edition(1)Particle Characteristics and Measurement(9)Interparticle Forces(1)Interactions in Gases

    Ishida Naoyuki, Matsusaka Shuji

    Journal of the Society of Powder Technology, Japan   54 ( 11 )   739 - 743   2017

     More details

    Language:Japanese   Publisher:The Society of Powder Technology, Japan  

    CiNii Article

    CiNii Books

    researchmap

  • Direct Measurement of Surface Forces::Effect of Nanoscopic Structure and Property of Surface on the Forces Invited

    ISHIDA Naoyuki

    Journal of the Japan Society of Colour Material   90 ( 9 )   333 - 338   2017

     More details

    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:Japan Society of Colour Material  

    Microscopic particles suspended in liquids, often called particle dispersions, can be found in many industrial processes as important materials and products. In order to handle the particle dispersions properly, evaluating the stability of the dispersions is fundamentally critical. The aggregating-dispersing behavior of the particles in liquids is dominated mainly by the interaction forces acting between the particles surfaces (surface forces). It is therefore significantly important for the precise evaluation of the dispersion stability to understand how such forces behave depending on the properties of the particle surfaces and solutions. This review provides general information on the techniques to measure surface forces directly. It also presents an overview of the studies on the direct measurements of the surface forces conducted so far, discussing the effect of nanoscopic structures and the properties of the surfaces on surface forces.&lt;/p&gt;

    DOI: 10.4011/shikizai.90.333

    CiNii Article

    CiNii Books

    researchmap

  • Fundamentals of Powder Technology, 2nd Edition(1)Particle Characteristics and Measurement(9)Interparticle Forces(1)Interactions in Gases

    松坂 修二, 石田 尚之, 松山 達

    Journal of the Society of Powder Technology, Japan   54 ( 11 )   739 - 743   2017

     More details

    Language:Japanese   Publisher:粉体工学会  

    CiNii Article

    CiNii Books

    researchmap

  • 1.9.1 Interactions in Gases

    Shuji Matsusaka, Naoyuki Ishida, Tatsushi Matsuyama

    Journal of the Society of Powder Technology, Japan   54 ( 11 )   739 - 743   2017

     More details

    Language:Japanese   Publisher:The Society of Powder Technology, Japan  

    DOI: 10.4164/sptj.54.739

    Scopus

    CiNii Article

    researchmap

  • 1. Particle characteristics and measurement 1.9 interparticle forces

    Naoyuki Ishida, Shuji Matsusaka

    Journal of the Society of Powder Technology, Japan   54 ( 11 )   738   2017

     More details

    Language:Japanese   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)   Publisher:Society of Powder Technology  

    DOI: 10.4164/sptj.54.738

    Scopus

    researchmap

  • Sugar surfactantの応用 : 油滴包括およびタンパク質安定化

    今村 維克, 石田 尚之, 今中 洋行

    日本食品工学会誌 = Japan journal of food engineering   17 ( 3 )   A - 7-11   2016.9

     More details

    Language:Japanese   Publisher:日本食品工学会  

    CiNii Article

    CiNii Books

    researchmap

  • Direct Measurement of Hydrophobic Attraction and Its Mechanism of Generation

    石田 尚之

    オレオサイエンス   15 ( 6 )   253 - 259   2015.6

     More details

    Language:Japanese   Publisher:日本油化学会  

    DOI: 10.5650/oleoscience.15.253

    CiNii Article

    CiNii Books

    researchmap

  • Direct Measurement of Hydrophobic Attraction and Its Mechanism of Generation

    ISHIDA Naoyuki

    Oleoscience   15 ( 6 )   253 - 259   2015

     More details

    Language:Japanese   Publisher:Japan Oil Chemists' Society  

    &lt;p&gt;It is well known that hydrophobic substances aggregate strongly in aqueous solution due to the hydrophobic attraction between such substances. The strength and long effective distance of the hydrophobic attraction has fascinated researchers since it was first measured directly. However, its origin is still in the heat of an argument despite numerous efforts have been devoted to disclose it, and no critical theory still cannot successfully explain its unusual long-range effectiveness. This review introduces a series of investigations on the hydrophobic attraction by direct measurements using atomic force microscopy (AFM), and provides a current overview of the origin and mechanisms of this attractive force.&lt;/p&gt;

    DOI: 10.5650/oleoscience.15.253

    CiNii Article

    researchmap

  • Direct Measurement of Solvophobic Force between Particles in Liquids and Its Origin

    ISHIDA Naoyuki

    Hosokawa Powder Technology Foundation ANNUAL REPORT   23 ( 0 )   38 - 43   2015

     More details

    Language:Japanese   Publisher:Hosokawa Powder Technology Foundation  

    &lt;p&gt;The interaction forces between hydrophobized silica surfaces with no nanobubbles were measured using atomic force microscopy (AFM). To obtain hydrophobic surfaces without nanobubbles, an aqueous solution was introduced between the surfaces following an exchange process involving several solvents. In the obtained approaching force curves, an attractive force was observed from a distance of 10–20 nm, which is an additional attractive force stronger than typical van der Waals attractions. We also conducted the force measurements between the fluorinated silica surfaces in formamide and found an attractive force that is stronger than the van der Waals attraction. This result confirms that the &#039;solvophobic attraction&#039;, which is very similar to the hydrophobic attraction, exists in some organic solvents. The interaction forces were also measured between a hydrophobized substrate and an AFM tip, which has the small radius of curvature. The range of the attraction was found to become smaller abruptly when the radius of curvature of the tip is around 100–200 nm, implying that the origin of the force is different depending on the size of the surfaces.&lt;/p&gt;

    CiNii Article

    researchmap

  • 2P-064 Screening of a novel Pd affinity peptide tag and characterization of tag conjugated protein immobilization

    Matoba Haruka, Ishida Naoyuki, Imamura Koreyoshi, Imanaka Hiroyuki

    67   190 - 190   2015

  • Experimental Evaluations for the Interaction Forces between Soft Interfaces

    ISHIDA Naoyuki

    Journal of the Society of Powder Technology, Japan   50 ( 8 )   567 - 575   2013.8

     More details

    Language:Japanese   Publisher:The Society of Powder Technology, Japan  

    Since the interaction forces between solid surfaces in solutions are critical to understand the aggregation-dispersion behavior of colloidal particles in dispersion systems, direct measurements of the interaction forces between surfaces have been conducted in a large variety of systems over a past few decades. Recently, much effort has been paid to enable direct measurements of the interaction forces between &quot;soft&quot; interfaces, which show large deformation in solutions such as oil droplets, bubbles, lipid bilayers and cell surfaces, adopting atomic force microscopy techniques. This review illustrates how the interactions between surfaces including such soft interfaces can be measured and summarizes the current literature describing such experiments.

    DOI: 10.4164/sptj.50.567

    CiNii Article

    CiNii Books

    researchmap

  • 岡山大学大学院自然科学研究科化学生命工学専攻生命工学講座バイオプロセス工学分野

    今村 維克, 石田 尚之, 今中 洋行

    化学工学 = Chemical engineering   77 ( 5 )   371 - 372   2013.5

     More details

  • The 10th International Symposium on Electrokinetic Phenomena : ELKIN2012

    ISHIDA Naoyuki

    粉体工学会誌   50 ( 1 )   57 - 58   2013.1

     More details

  • Direct Measurement of Hydrophobic Attraction and Elucidation of its Mechanism

    ISHIDA Naoyuki

    Journal of The Adhesion Society of Japan   49 ( 8 )   305 - 310   2013

     More details

    Language:Japanese   Publisher:The Adhesion Society of Japan  

    DOI: 10.11618/adhesion.49.305

    CiNii Article

    researchmap

  • Microstructural Observation and Property Characterization of Stimuli-Responsive Polymer Grafted onto Solid Surface Using AFM and QCM-D

    ISHIDA Naoyuki

    Oleoscience   12 ( 4 )   151 - 158   2012

     More details

    Language:Japanese   Publisher:Japan Oil Chemists' Society  

    It is well known that poly(N-isopropylacrylamide) (PNIPAM) exhibits thermally responsive properties in water. At a lower critical solution temperature (LCST) of around 32°C, PNIPAM chains show phase transition from coil to globule state. Therefore, solids on which the PNIPAM is grafted are expected to be applicable to a wide variety of industrial fields using expanding-shrinking property depending on temperature. In this study, the structural changes of the PNIPAM chains grafted onto solid plates were investigated in aqueous solutions with an atomic force microscope (AFM) and a quartz crystal microbalance with dissipation (QCM-D). By AFM imaging, the transition of the grafted PNIPAM chains from brush to mushroom state was visualized. QCM-D signals showed significant change at around LCST, indicating that PNIPAM underwent a collapse by the dehydration of the chains. A complementary investigation indicated that a similar transition could be observed in solutions of high concentration electrolytes. It was also found that the grafting density of the PNIPAM chains had a critical role for the conformational behaviour of the PNIPAM.

    DOI: 10.5650/oleoscience.12.151

    CiNii Article

    researchmap

  • The Fifth Biennial Australian Colloid and Interface Symposium

    ISHIDA Naoyuki

    Journal of the Society of Powder Technology,Japan   48 ( 7 )   495 - 497   2011.7

     More details

    Language:Japanese   Publisher:粉体工学会  

    CiNii Article

    CiNii Books

    researchmap

  • Experimental Investigation of the Interaction Forces between Soft Interfaces

    ISHIDA Naoyuki

    Oleoscience   11 ( 3 )   79 - 84   2011

     More details

    Language:Japanese   Publisher:Japan Oil Chemists' Society  

    Direct measurements of the interaction forces between surfaces are critical to understand the aggregation-dispersion behaviour of colloidal particles in dispersed systems. The interaction forces between solid surfaces in solutions, therefore, have been measured in a large variety of systems over a past few decades. Recently, much effort has been paid to enable direct measurements of the surface forces between &amp;ldquo;soft&amp;rdquo; interface, which show large deformation in solutions such as oil droplets, bubbles, lipid layers and cell surfaces, adopting atomic force microscopy techniques. It is the purpose of this review to illustrate how the interactions between surfaces including such soft interfaces can be measured and to summarise the current literature describing such experiments.

    DOI: 10.5650/oleoscience.11.79

    CiNii Article

    researchmap

  • 表面に固定した感温性高分子のナノ構造直接観察と物性評価

    石田 尚之

    C & I commun : colloid & interface communication : newsletter from DCSC   36 ( 1 )   30 - 32   2011

     More details

    Language:Japanese   Publisher:日本化学会コロイドおよび界面化学部会  

    CiNii Article

    researchmap

  • 81st ACS Colloid & Surface Science Symposium

    ISHIDA Naoyuki

    粉体工学会誌 = Journal of the Society of Powder Technology, Japan   45 ( 2 )   118 - 119   2008.2

     More details

  • The Life and Times in the United Kingdom

    ISHIDA Naoyuki

    Journal of the Society of Powder Technology,Japan   44 ( 10 )   760 - 763   2007.10

     More details

    Language:Japanese   Publisher:粉体工学会  

    DOI: 10.4164/sptj.44.760

    CiNii Article

    researchmap

  • The Life and Times in the United Kingdom

    Ishida Naoyuki

    Journal of the Society of Powder Technology, Japan   44 ( 10 )   760 - 763   2007

     More details

    Publisher:The Society of Powder Technology, Japan  

    DOI: 10.4164/sptj.44.760

    CiNii Article

    researchmap

  • Direct Measurement of Surface Forces in Liquids : Measurement of Hydrophobic Attraction

    ISHIDA Naoyuki

    Journal of the Society of Powder Technology,Japan   42 ( 5 )   342 - 346   2005.5

     More details

    Language:Japanese   Publisher:粉体工学会  

    DOI: 10.4164/sptj.42.342

    CiNii Article

    CiNii Books

    researchmap

  • Direct Measurement of Surface Forces in Liquids-Measurement of Hydrophobic Attraction-:Measurement of Hydrophobic Attraction

    Ishida Naoyuki

    Journal of the Society of Powder Technology, Japan   42 ( 5 )   342 - 346   2005

     More details

    Language:Japanese   Publisher:The Society of Powder Technology, Japan  

    Direct measurement of the interaction forces between solid surfaces in liquids has become an important technique in recent years for understanding the various microscopic phenomena that affect the behavior of fine particles in many industrial processes. The history and the development of the direct measurements of surface forces are briefly reviewed. As a practical example of the force measurements, a series of the investigations for hydrophobic attraction, which is the interaction between hydrophobic surfaces in aqueous solution, using an atomic force microscope is introduced.

    DOI: 10.4164/sptj.42.342

    CiNii Article

    researchmap

  • ナノ粒子の分散・凝集評価のための表面間力測定技術 (特集 粉体工業分野におけるナノテク関連評価技術)

    石田 尚之

    粉体と工業   36 ( 6 )   65 - 73   2004.6

     More details

    Language:Japanese   Publisher:粉体と工業社  

    CiNii Article

    CiNii Books

    researchmap

  • 感温性表面によるエマルションの油水分離に関する基礎的研究

    石田 尚之, 四元 弘毅

    春季大会講演集. I, 資源編   16 ( 2 )   45 - 46   2004.3

     More details

  • 原子間力顕微鏡による水溶液中の微粒子・気泡間相互作用力の直接測定

    石田 尚之, 四元 弘毅

    春季大会講演集. I, 資源編   14 ( 2 )   72 - 73   2002.3

     More details

  • 水溶液中における疎水性表面間力の発現機構

    石田 尚之

    粉体工学会誌   37 ( 11 )   826 - 827   2000.11

     More details

  • 第34回夏期シンポジウム総合討論 : 粒子表面のキャラクタリゼーション

    石田 尚之

    粉体工学会誌   36 ( 3 )   214 - 222   1999.3

     More details

    Language:Japanese   Publisher:粉体工学会  

    CiNii Article

    CiNii Books

    researchmap

▼display all

Presentations

  • An AFM study on the interaction forces between silanated silica surfaces in organic solvents: Effect of the interactions on stability of particle dispersions

    Naoyuki Ishida, Ai Sakamoto, Akifumi Ohnishi, Koreyoshi Imamura

    APT2021: 8th Asian Particle Technology Symposium  2021.10.11 

     More details

    Event date: 2021.10.11 - 2021.10.14

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • Conformational Transitions of Poly (N-isopropylacrylamide) layers on silica in alcohols and binary solvents Invited

    Naoyuki Ishida, Koreyoshi Imamura

    2021.9.21 

     More details

    Event date: 2021.9.21

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • 溶媒緩和NMRによる有機溶媒中での固体表面-溶媒分子間の親和性の評価と表面間力への影響の解析

    大西晃史, 坂本愛衣, 今村維克, 石田尚之

    第72回コロイドおよび界面化学討論会  2021.9.15 

     More details

    Event date: 2021.9.15 - 2021.9.18

    Presentation type:Oral presentation (general)  

    researchmap

  • Characterisation of the properties and structure of Poly(N-isopropylacrylamide) layers on silica in alcohols and binary solvents

    Naoyuki Ishida

    ACIS2021: The 10th Australian Colloid and Interface Symposium  2021.2.10 

     More details

    Event date: 2021.2.8 - 2021.2.11

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • 疎水性基板上での水ー有機溶媒混合液滴の蒸発挙動の観察

    玉木孝征, 今中洋行, 今村維克, 石田尚之

    化学工学会中国四国支部 2020広島大会  2020.12.11  化学工学会中国四国支部

     More details

    Event date: 2020.12.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  • 高分子水溶液中におけるアルミナ表面間相互作用のAFM直接測定

    岸本直人, 今中洋行, 今村維克, 石田尚之

    化学工学会中国四国支部 2020広島大会  2020.12.11  化学工学会中国四国支部

     More details

    Event date: 2020.12.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  • タンパク質–固体表面間に働く相互作用のAFM直接測定

    松木涼馬, 今中洋行, 今村維克, 石田尚之

    化学工学会中国四国支部 2020広島大会  2020.12.11  化学工学会中国四国支部

     More details

    Event date: 2020.12.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  • トリブロックコポリマー水溶液中におけるシリカ表面間相互作用の AFM直接測定:ポリマー濃度と共存塩の影響

    出口拓海, 中原毅人, 今中洋行, 今村維克, 石田尚之

    日本油化学会第59回年会 

     More details

    Event date: 2020.11.2 - 2020.11.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  • 水溶液中のシリカ表面間に働く水和斥力に与えるイオン種の影響: AFM直接測定による検討

    野崎真由, 今中洋行, 今村維克, 石田尚之

    日本油化学会第59回年会 

     More details

    Event date: 2020.11.2 - 2020.11.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  • Evaluation of Non-DLVO Forces between Surfaces in Liquids by Atomic Force Microscopy Invited International conference

    Naoyuki Ishida

    Australia-Japan Colloids Symposium 2020 

     More details

    Event date: 2020.9.17 - 2020.9.18

    Language:English   Presentation type:Oral presentation (keynote)  

    researchmap

  • 分散凝集に寄与する表面間力の直接測定 –疎水性引力と溶媒和力を中心に– Invited

    石田尚之

    第71回コロイドおよび界面化学討論会  日本化学会 コロイドおよび界面化学部会

     More details

    Event date: 2020.9.14 - 2020.9.16

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン  

    researchmap

  • 有機溶媒および混合溶媒中における温度応答性ポリマーグラフト表面の物性・構造の評価

    小笠原史織, 今中洋行, 今村維克, 石田尚之

    第71回コロイドおよび界面化学討論会  日本化学会 コロイドおよび界面化学部会

     More details

    Event date: 2020.9.14 - 2020.9.16

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン  

    researchmap

  • Exploring the characteristics of “short-range” hydrophobic attraction: non-aqueous solvents, dissimilar surfaces, and effect of surfactants International conference

    Naoyuki Ishida, Yuhei Soga, Kohei Matsuo, Shota Kage, Koreyoshi Imamura

    Okinawa Colloids 2019 

     More details

    Event date: 2019.11.4 - 2019.11.8

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • 分散剤水溶液中におけるアルミナ表面間相互作用のAFM直接測定

    岸本直人,今中洋行,今村維克,石田尚之

    粉体工学会2019年度秋期研究発表会 

     More details

    Event date: 2019.10.15 - 2019.10.16

    Language:Japanese   Presentation type:Poster presentation  

    researchmap

  • 柔らかい疎水性表面間における相互作用力のAFM直接測定

    石田尚之, 奥田悠太, 今中洋行,今村維克

    日本油化学会第58回年会 

     More details

    Event date: 2019.9.24 - 2019.9.26

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  • 有機溶媒中での固体表面間相互作用の AFM 直接測定 : 溶媒分子-表面間の親和性の影響

    坂本愛衣, 今中洋行,今村維克,石田尚之

    日本油化学会第58回年会 

     More details

    Event date: 2019.9.24 - 2019.9.26

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  • タンパク質と疎水性固体表面間に働く相互作用の AFM 直接測定

    松木涼馬,今中洋行,今村維克,石田尚之

    日本油化学会第58回年会 

     More details

    Event date: 2019.9.24 - 2019.9.26

    Language:Japanese   Presentation type:Poster presentation  

    researchmap

  • 微小表面を用いた疎水性引力の AFM 直接測定:引力に与える表面サイズの影響

    板倉聖人, 今中洋行,今村維克,石田尚之

    日本油化学会第58回年会 

     More details

    Event date: 2019.9.24 - 2019.9.26

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  • AFM measurement of interaction force between silanated silica surfaces in organic solvents International conference

    Naoyuki Ishida, Ai Sakamoto, Koreyoshi Imamura

    The 33rd Conference of the European Colloid and Interface Society (ECIS)  European Colloid and Interface Society

     More details

    Event date: 2019.9.8 - 2019.9.13

    Language:English   Presentation type:Poster presentation  

    Venue:Leuven, Belgium  

    researchmap

  • Direct measurement of the interaction forces between silanated silica surfaces in organic solvents: Effect of affinity between surface and solvent molecules on the interaction International conference

    Naoyuki Ishida, Ai Sakamoto, Hiroyuki Imanaka, Koreyoshi Imamura

    The 9th biennial Australian Colloid and Interface Symposium  Australian Colloid and Interface Society

     More details

    Event date: 2019.2.3 - 2019.2.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hobart, Australia  

    researchmap

  • 有機溶媒中での固体間相互作用の直接測定:相互作用への 表面?溶媒分子の親和性の影響

    坂本愛衣,今中洋行,今村維克,石田尚之

    第69回コロイドおよび界面化学討論会 

     More details

    Event date: 2018.9.18 - 2018.9.20

    Language:Japanese   Presentation type:Poster presentation  

    Venue:筑波大学  

    researchmap

  • 疎水性引力に与える混合溶媒および表面サイズの影響

    板倉聖人,岩崎由希,今中洋行,今村維克,石田尚之

    第69回コロイドおよび界面化学討論会 

     More details

    Event date: 2018.9.18 - 2018.9.20

    Language:Japanese   Presentation type:Poster presentation  

    Venue:筑波大学  

    researchmap

  • 水溶液中の疎水性表面間の相互作用に与える 各種分散剤の影響

    鹿毛 翔太,今中 洋行,今村 維克,石田 尚之

    日本油化学会第57回年会 

     More details

    Event date: 2018.9.4 - 2018.9.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  • トリブロックコポリマー水溶液中でのシリカ表面間相互作用のAFM 直接測定:温度と塩の影響

    石田尚之, 出口拓海,今中洋行,今村維克,Timothy Murdoch, Grant Webber, Erica Wanless

    日本油化学会第57回年会 

     More details

    Event date: 2018.9.4 - 2018.9.6

    Presentation type:Oral presentation (general)  

    researchmap

  • 原子間力顕微鏡による気液および固液界面間相互作用力の直接測定 Invited

    石田尚之

    環境資源工学会 第137回学術講演会 

     More details

    Event date: 2018.6.28

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    researchmap

  • 有機溶媒中における粒子表面間の溶媒和力と微粒子分散

    石田尚之

    粉体工学会2018年度春期研究発表会 

     More details

    Event date: 2018.5.15 - 2018.5.16

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  • Hydriphobic Attraction between Silanated Silica Surfaces of Different Hydrophobicity International conference

    Naoyuki Ishida, Kohei Matsuo, Hiroyuki Imanaka, Koreyoshi Imamura

    World Congress on Particle Technology 

     More details

    Event date: 2018.4.22 - 2018.4.26

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • 分散における粒子間相互作用:非DLVO 力の直接測定による評価

    石田尚之

    分散凝集の学理構築への戦略  日本化学会新領域研究グループ「分散凝集の学理構築への戦略」

     More details

    Event date: 2018.3.27

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  • Direct Measurement of Interaction Forces between Liquid-Gas and Solid-Liquid Interfaces by Atomic Force Microscopy Invited

    石田 尚之

    Resources processing  2018  環境資源工学会

     More details

    Event date: 2018

    Language:Japanese  

    researchmap

  • 有機溶媒-水混合溶液中におけるシリカ表面間力のAFM直接測定

    松山 勇太, 今中 洋行, 今村 維克, 石田 尚之

    第68回コロイドおよび界面化学討論会  日本化学会コロイドおよび界面化学部会

     More details

    Event date: 2017.9.6 - 2017.9.8

    Language:Japanese   Presentation type:Poster presentation  

    Venue:神戸大学  

    researchmap

  • 水溶液中の疎水性表面間に働く相互作用に与える分散剤の影響

    鹿毛 翔太, 今中 洋行, 今村 維克, 石田 尚之

    第68回コロイドおよび界面化学討論会  日本化学会コロイドおよび界面化学部会

     More details

    Event date: 2017.9.6 - 2017.9.8

    Language:Japanese   Presentation type:Poster presentation  

    Venue:神戸大学  

    researchmap

  • Interaction Forces between Silanated Silica Surfaces of Different Hydrophobicity International conference

    Naoyuki Ishida, Kohei Matsuo, Hiroyuki Imanaka, Koreyoshi Imamura

    The 8th biennial Australian Colloid and Interface Symposium  Australian Colloid and Interface Society

     More details

    Event date: 2017.1.29 - 2017.2.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Coffs Harbor, Australia  

    researchmap

  • Exploring the origin of hydrophobic attraction: What is understood and what is not? Invited International conference

    Naoyuki Ishida

    4th International Kyushu Colloid Colloquium  日本化学会コロイドおよび界面化学部会九州支部

     More details

    Event date: 2016.9.27 - 2016.9.28

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:西新プラザ  

    researchmap

  • 柔らかい疎水性表面における相互作用力のAFMによる直接測定

    奥田 悠太, 今中 洋行, 今村 維克, 石田 尚之

    第67回コロイドおよび界面化学討論会  日本化学会コロイドおよび界面化学部会

     More details

    Event date: 2016.9.22 - 2016.9.24

    Language:Japanese   Presentation type:Poster presentation  

    Venue:北海道教育大学旭川校  

    researchmap

  • トリブロックコポリマー水溶液中でのシリカ表面間相互作用のAFM直接測定

    出口 拓海, 今中 洋行, 今村 維克, 石田 尚之

    第67回コロイドおよび界面化学討論会  日本化学会コロイドおよび界面化学部会

     More details

    Event date: 2016.9.22 - 2016.9.24

    Language:Japanese   Presentation type:Poster presentation  

    Venue:北海道教育大学旭川校  

    researchmap

  • タンパク質と金属表面間相互作用の原子間力顕微鏡による直接測定

    石田 尚之, 川口 陽, 今中 洋行, 今村 維克

    粉体工学会第52回夏期シンポジウム  粉体工学会

     More details

    Event date: 2016.8.8 - 2016.8.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:神戸  

    researchmap

  • 原子間力顕微鏡による液相中での固体間相互作用の直接測定と疎水性引力 Invited

    石田尚之

    日本接着学会第3回関西支部 岡山講演会  日本接着学会関西支部

     More details

    Event date: 2016.3.14

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    researchmap

  • Thermoresponsive Behavior of Catecholamine Sensitive Copolymer of N-Isopropylacrylamide and Phenylboronic Acid International conference

    Ryotaro Kohara, Hiroyuki Imanaka, Koreyoshi Imamura, Naoyuki Ishida

    The 6th Asian Conference on Colloid and Interface Science (ACCIS2015 Japan)  Asian Society for Colloid and Surface Science

     More details

    Event date: 2015.11.24 - 2015.11.27

    Language:English   Presentation type:Poster presentation  

    Venue:Sasebo, Japan  

    researchmap

  • Interaction Forces between Hydrophobic Surfaces in Water-Organic Solvent Binary Mixtures International conference

    Naoyuki Ishida, Kengo Terada, Hiroyuki Imanaka, Koreyoshi Imamura

    The 6th Asian Conference on Colloid and Interface Science (ACCIS2015 Japan)  The Australasian Colloids and Interface Society

     More details

    Event date: 2015.11.24 - 2015.11.27

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Sasebo, Japan  

    researchmap

  • Interaction Force between Hydrophobized Silica Surfaces in Water-Organic Solvent Mixtures International conference

    Naoyuki Ishida, Kengo Terada, Hiroyuki Imanaka, Koreyoshi Imamura

    The Western Pacific Colloids Meeting 2015 (WPC 2015)  The Australasian Colloids and Interface Society

     More details

    Event date: 2015.11.15 - 2015.11.19

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Siem Reap, Cambodia  

    researchmap

  • 水-水溶性有機溶媒中での疎水性表面間相互作用の直接測定

    寺田 健悟,今中 洋行,今村 維克,石田 尚之

    粉体工学会2015年度秋期研究発表会  粉体工学会

     More details

    Event date: 2015.10.13 - 2015.10.14

    Language:Japanese   Presentation type:Poster presentation  

    Venue:大阪  

    researchmap

  • 水中の疎水化シリカ表面間に働く短距離性疎水性引力に及ぼす表面の疎水性の影響 Invited

    曽我 友平,今中 洋行,今村 維克,石田 尚之

    粉体工学会2015年度秋期研究発表会  粉体工学会

     More details

    Event date: 2015.10.13 - 2015.10.14

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:大阪  

    researchmap

  • 異なる疎水度をもつ粒子?基板間相互作用力のAFM測定

    松尾 康平,今中 洋行,今村 維克,石田 尚之

    粉体工学会2015年度秋期研究発表会  粉体工学会

     More details

    Event date: 2015.10.13 - 2015.10.14

    Language:Japanese   Presentation type:Poster presentation  

    Venue:大阪  

    researchmap

  • Direct Measurements of Interaction Forces between Proteins and Metal Surfaces by Atomic Force Microscopy International conference

    Naoyuki Ishida, Hikaru Kawaguchi, Hiroyuki Imanaka, Koreyoshi Imamura

    The 16th Asian Pacific Confederation of Chemical Congress (APCChe2015)  The Royal Australian Chemical Institute

     More details

    Event date: 2015.9.27 - 2015.10.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Melbourne, Australia  

    researchmap

  • 原子間力顕微鏡によるタンパク質と金属表面間相互作用 のin situ評価

    川口 陽, 今中 洋行, 今村 維克, 石田 尚之

    第66回コロイドおよび界面化学討論会  日本化学会コロイドおよび界面化学部会

     More details

    Event date: 2015.9.10 - 2015.9.12

    Language:Japanese   Presentation type:Poster presentation  

    Venue:鹿児島大学  

    researchmap

  • 水−水溶性有機溶媒混合溶液中における疎水性表面間の相互作用

    寺田 健悟, 今中 洋行, 今村 維克, 石田 尚之

    第66回コロイドおよび界面化学討論会  日本化学会コロイドおよび界面化学部会

     More details

    Event date: 2015.9.10 - 2015.9.12

    Language:Japanese   Presentation type:Poster presentation  

    Venue:鹿児島大学  

    researchmap

  • 異なる疎水度をもつ疎水性表面間に働く相互作用力の AFM 直接測定

    松尾 康平, 今中 洋行, 今村 維克, 石田 尚之

    第66回コロイドおよび界面化学討論会  日本化学会コロイドおよび界面化学部会

     More details

    Event date: 2015.9.10 - 2015.9.12

    Language:Japanese   Presentation type:Poster presentation  

    Venue:鹿児島大学  

    researchmap

  • 微小表面間に働く疎水性引力の直接測定

    石田 尚之, 池田 享平, 曽我 友平, 今中 洋行, 今村 維克

    第66回コロイドおよび界面化学討論会  日本化学会コロイドおよび界面化学部会

     More details

    Event date: 2015.9.10 - 2015.9.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鹿児島大学  

    researchmap

  • AFMによる改質シリカ表面間の「疎液性引力」の直接測定

    石田 尚之, 曽我 友平, 今中 洋行, 今村 維克

    第9回中四国若手CE合宿  化学工学会中国四国支部

     More details

    Event date: 2015.9.4 - 2015.9.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:広島  

    researchmap

  • Nanostructural analysis of poly(N-isopropylacryamide) and its copolymers grafted onto solid surface International conference

    Naoyuki Ishida

    International Conference of Colloids and Interface Science, 2015  The Taiwanese Colloid and Interface Society

     More details

    Event date: 2015.7.22 - 2015.7.24

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Taipei, Taiwan  

    researchmap

  • Interaction Forces between Silanated Silica Surfaces in Water-Organic Solvent Mixtures International conference

    Naoyuki Ishida, Kengo Terada, Yuhei Soga, Hiroyuki Imanaka, Koreyoshi Imamura

    15th Conference of the International Association of Colloid and Interface Scientists  The international Association of Colloid and Interface Scientists

     More details

    Event date: 2015.5.24 - 2015.5.29

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Mainz, Germany  

    researchmap

  • Interaction force between silanated silica surfaces in organic solvents International conference

    Naoyuki Ishida, Yuhei Soga, Hiroyuki Imanaka, Koreyoshi Imamura

    The seventh biennial Australian Colloid and Interface Symposium  The Australasian Colloid and Interface Society

     More details

    Event date: 2015.2.1 - 2015.2.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hobart  

    researchmap

  • 疎水性引力の直接測定とその発現機構 Invited

    石田尚之

    平成26年度 物理化学インターカレッジセミナー 兼日本油化学会界面科学部会九州地区講演会 

     More details

    Event date: 2015.1.7 - 2015.1.8

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:福岡大学セミナーハウス  

    researchmap

  • 微粒子表面の疎水性と表面間の相互作用力との相関の検討

    石田 尚之, 曽我 友平, 池田 亨平, 今中 洋行, 今村 維克

    第52回粉体に関する討論会  粉体工学会ほか

     More details

    Event date: 2014.9.25 - 2014.9.27

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:じばさんびる(姫路市)  

    researchmap

  • AFMを用いた液相中での固体間相互作用の直接測定 Invited

    石田尚之

    平成26年度 先端膜工学研究推進機構秋季講演会  一般社団法人先端膜工学研究推進機構

     More details

    Event date: 2014.9.19

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:神戸大学  

    researchmap

  • 感温性高分子の相転移に与えるカテコールアミン認識コポリマーの影響

    小原 涼太郎, 今中 洋行, 今村 維克, 石田 尚之

    化学工学会 第46回秋季大会  化学工学会

     More details

    Event date: 2014.9.17 - 2014.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 伊都キャンパス  

    researchmap

  • 微粒子テンプレート法による基板上への分子パターニングと規則孔構造の形成

    西原 亮平, 今中 洋行, 今村 維克, 石田 尚之

    化学工学会 第46回秋季大会  化学工学会

     More details

    Event date: 2014.9.17 - 2014.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 伊都キャンパス  

    researchmap

  • コロイドプローブAFMによる改質シリカ表面間の疎液性引力の直接測定

    石田 尚之, 曽我 友平, 池田 亨平, 今中 洋行, 今村 維克

    化学工学会 第46回秋季大会  化学工学会

     More details

    Event date: 2014.9.17 - 2014.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 伊都キャンパス  

    researchmap

  • 表面に固定したpoly(N-isopropylacrylamide)の構造変化に及ぼす電解質の影響

    石田尚之, サイモン・ビックス

    第65回コロイドおよび界面化学討論会  日本化学会コロイドおよび界面化学部会

     More details

    Event date: 2014.9.3 - 2014.9.5

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京理科大学 神楽坂キャンパス  

    researchmap

  • 温度応答性コポリマーグラフト表面の構造制御とタンパク質の吸着

    細田 直希, 今中 洋行, 今村 維克, 石田 尚之

    第65回コロイドおよび界面化学討論会  日本化学会コロイドおよび界面化学部会

     More details

    Event date: 2014.9.3 - 2014.9.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京理科大学 神楽坂キャンパス  

    researchmap

  • AFM探針と基板表面間に働く疎水性引力の直接測定

    池田 亨平, 曽我 友平, 今中 洋行, 今村 維克, 石田 尚之

    第65回コロイドおよび界面化学討論会  日本化学会コロイドおよび界面化学部会

     More details

    Event date: 2014.9.3 - 2014.9.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京理科大学 神楽坂キャンパス  

    researchmap

  • ナノバブルを除去した疎水性表面間の相互作用力

    曽我 友平, 今中 洋行, 今村 維克, 石田 尚之

    第65回コロイドおよび界面化学討論会  日本化学会コロイドおよび界面化学部会

     More details

    Event date: 2014.9.3 - 2014.9.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京理科大学 神楽坂キャンパス  

    researchmap

  • 表面の疎液性と表面間の引力との相関について

    石田尚之, 曽我 友平, 今中 洋行, 今村 維克

    第65回コロイドおよび界面化学討論会  日本化学会コロイドおよび界面化学部会

     More details

    Event date: 2014.9.3 - 2014.9.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京理科大学 神楽坂キャンパス  

    researchmap

  • 感温性表面の基礎物性解析とイギリス・オーストラリアでの研究生活の紹介 Invited

    石田尚之

    第8回中四国若手CE合宿  化学工学会中四国支部

     More details

    Event date: 2014.8.4 - 2014.8.5

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    researchmap

  • Direct Measurement of Solvophobic Attraction between Fluorinated Silica Surfaces by Atomic Force Microscopy

    Naoyuki Ishida, Yuhei Soga, Hiroyuki Imanaka, Koreyoshi Imamura

    第64回コロイドおよび界面化学討論会 

     More details

    Event date: 2013.9.18 - 2013.9.20

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • Short-ranged Hydrophobic Attraction between Silanated Silica Surfaces and Solvophobic Attraction International conference

    27th Conference of the European Colloid and Interface Society 

     More details

    Event date: 2013.9.1 - 2013.9.6

    Language:English   Presentation type:Poster presentation  

    researchmap

  • 固体表面に固定した感温性高分子のAFMおよび QCM-Dによる構造・物性解析 Invited

    石田尚之

    平成25年岡山地区化学工学懇話会 第1回特別講演会 

     More details

    Event date: 2013.5.16

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    researchmap

  • 2次元微粒子配列構造の秩序性に与える表面間力の影響

    日下 靖之, 牛島 洋史, 石田 尚之

    化学工学会 第78年会 

     More details

    Event date: 2013.3.17 - 2013.3.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  • AFMおよびQCM-Dを用いた感温性高分子のミクロ構造直接観察と物性評価 Invited

    石田尚之

    H25オレオマテリアル部会関西地区講演会 

     More details

    Event date: 2013.1.7

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    researchmap

  • 2P-076 The influence of orientation and density of immobilized ligand molecule on biomolecular interaction

    Matsushita Runa, Ishida Naoyuki, Imamura Koreyoshi, Imanaka Hiroyuki

    2013 

     More details

    Event date: 2013

    Language:Japanese  

    researchmap

    Other Link: http://search.jamas.or.jp/link/ui/2014247513

  • 3P-180 Screening of novel gold affinity peptide and its application on protein immobilization

    Shigemori Yojiro, Ishida Naoyuki, Imamura Koreyoshi, Takahashi Yuichiro, Imanaka Hiroyuki

    2013 

     More details

    Event date: 2013

    Language:Japanese  

    researchmap

  • Nanostructural Analysis of Poly(N-isopropylacryamide) Grafted onto Solid Surface Using AFM and QCM-D Invited International conference

    Naoyuki Ishida, Simon Biggs

    10th Japan-Korea Symposium on Materials & Interface International Symposium on Frontiers in Chemical Engineering 

     More details

    Event date: 2012.11.7 - 2012.11.10

    Language:English   Presentation type:Oral presentation (invited, special)  

    researchmap

  • Force between Hydrophobic Silica Surfaces—Measurement of ‘True’ Hydrophobic Attraction International conference

    Naoyuki Ishida, Yasuyuki Kusaka, Hirobumi Ushijima

    The 10th International Symposium on Electrokinetic Phenomena (ELKIN 10th) 

     More details

    Event date: 2012.5.20 - 2012.5.24

    Language:English   Presentation type:Poster presentation  

    researchmap

  • Effect of Surface Forces on Ordering of Two-dimensional Colloidal Crystals Formed on Polyelectrolyte Multilayers International conference

    Yasuyuki Kusaka, Naoyuki Ishida, Hirobumi Ushijima

    The 10th International Symposium on Electrokinetic Phenomena (ELKIN 10th) 

     More details

    Event date: 2012.5.20 - 2012.5.24

    Language:English   Presentation type:Poster presentation  

    researchmap

  • An AFM Study on Effects of Surface Forces on Formation of Two Dimensional Colloidal Monolayers International conference

    Yasuyuki Kusaka, Naoyuki Ishida, Hirobumi Ushijima

    The 10th International Symposium on Electrokinetic Phenomena (ELKIN 10th) 

     More details

    Event date: 2012.5.20 - 2012.5.24

    Language:English   Presentation type:Poster presentation  

    researchmap

  • Interaction Force between Hydrophobic Surfaces without Nanobubbles—Measurement of ‘True’ Hydrophobic Attraction International conference

    Naoyuki Ishida, Yasuyuki Kusaka, Hirobumi Ushijima

    International Association of Colloid and Interface Scientists 2012 

     More details

    Event date: 2012.5.13 - 2012.5.18

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • Experimental investigation of the interaction forces between solid surfaces - Seeking the origin of “Hydrophobic Attraction” International conference

    Naoyuki Ishida

    Australian/MANA workshop on Nanoarchitectonics for Innoative Materials & Systems 

     More details

    Event date: 2012.5.10 - 2012.5.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    researchmap

  • Effect of Surface Forces on Ordering of Two-dimensional Colloidal Crystals Formed on Polyelectrolyte Multilayers International conference

    Yasuyuki Kusaka, Naoyuki Ishida, Hirobumi Ushijima

    Japan-Australia Colloid and Interface Science Symposium 

     More details

    Event date: 2011.11.21 - 2011.11.23

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • Structural Behaviour of Poly(N-isopropylacryamide) Grafted onto Solid Surface: Effect of Molecular Weight and Grafting Density

    Naoyuki Ishida, Simon Biggs

    第63回コロイドおよび界面化学討論会 

     More details

    Event date: 2011.9.7 - 2011.9.9

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • 感温性高分子poly(N-isopropylacrylamide)の微粒子分散系制御への適用 Invited

    石田尚之

    第3回先端微粒子ハンドリング講演会  化学工学会 粒子・流体プロセス部会 粉体プロセス分科会

     More details

    Event date: 2011.9.7

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    researchmap

  • 疎水性引力の評価と発現機構 Invited

    石田尚之

    第7回日本接着学会関西支部 若手の会 

     More details

    Event date: 2011.8.30

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    researchmap

  • 柔らかな界面における相互作用の直接測定による評価

    石田尚之

    界面動電現象研究会サマースクール2011 ?微生物とコロイドのソフト界面?  界面動電現象研究会

     More details

    Event date: 2011.8.27

    Language:Japanese   Presentation type:Oral presentation (keynote)  

    researchmap

  • 表面に固定した感温性高分子poly(N-isopropylacrylamide)のQCM-DおよびAFMによる構造解析

    石田尚之

    QCMテクノロジーセミナー2011  メイワフォーシス

     More details

    Event date: 2011.8.12

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    researchmap

  • 「真の」疎水性引力の評価 —ナノ気泡を除いた疎水性表面間の相互作用—

    石田尚之

    2011年度粉体工学会春期研究発表会 

     More details

    Event date: 2011.5.24 - 2011.5.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  • he Effect of Grafting Density on Phase Transition Behaviour for Poly(N-isopropylacryamide) Brushes in Aqueous Solutions International conference

    Naoyuki Ishida, Simon Biggs

    The Fifth Biennial Australian Colloid and Interface Symposium 

     More details

    Event date: 2011.1.30 - 2011.2.3

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • Hydrophobic Force between Silanated Silica Surfaces without Bubbles - Measurement of ‘True’ Hydrophobic Attraction International conference

    Naoyuki Ishida

    The Fifth Biennial Australian Colloid and Interface Symposium 

     More details

    Event date: 2011.1.30 - 2011.2.3

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • Interaction Forces between Silanated Silica Surfaces: Measuring the ‘True’ Hydrophobic Attraction International conference

    Naoyuki Ishida

    IInternational Conference on Nanoscopic Colloid and Surface Science (NCSS2010) 

     More details

    Event date: 2010.9.19 - 2010.9.22

    Language:English   Presentation type:Oral presentation (general)  

    researchmap

  • 人工ダイヤモンドおよびグラファイトへの無機抑制剤の吸着と浮遊率の関係

    石田 尚之, ダンフォード ムアイポポ, 日下 英史, 福中 康博, 中廣 吉孝

    一般発表(研究・業績発表)講演要旨集  1996.3.29 

     More details

    Event date: 1996.3.29

    Language:Japanese  

    researchmap

  • 表面の親疎水性と表面間力:直接測定から見えるもの Invited

    石田尚之

    21-1高分子と水・分離に関する研究会および2021年度界面動電現象研究会  2022.3.4 

     More details

▼display all

Research Projects

  • 新たな視点に基づく非水液体中での微粒子分散評価体系の構築

    Grant number:21H01639  2021.04 - 2024.03

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    石田 尚之, 森 隆昌

      More details

    Grant amount:\16120000 ( Direct expense: \12400000 、 Indirect expense:\3720000 )

    researchmap

  • Transport of Colloidal Particles in Unsaturated Soils

    Grant number:21H01424  2021.04 - 2024.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    濱本 昌一郎, 竹村 貴人, 大竹 豊, 石田 尚之, 杉本 卓也

      More details

    Grant amount:\17550000 ( Direct expense: \13500000 、 Indirect expense:\4050000 )

    researchmap

  • Efficient spatial confinement of incident electric field on subwavelength-scale structures having cycloid-like cross section and its application for sensitive biosensor

    Grant number:26288114  2014.04 - 2018.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    Fukuda Takashi

      More details

    Grant amount:\16770000 ( Direct expense: \12900000 、 Indirect expense:\3870000 )

    From our preliminary research, we have found that subwavelength-scale structures having cycloid-like cross section is effective for electric field confinement, and it is suitable for highly sensitive biosensing. According to the basis, we have developed the functional structure, fabrication procedure especially obtaining the sensing tip on flexible polymer films, and surface functionalization of the sensor chip. As a result, we achieved sufficient progress towards the realization of a highly sensitive portable sensing system that obviates the spectroscopic measurement with a spectrophotometer. Furthermore, concerning the development on high-speed calculation of electric field propagation, we have found succeeded to derive a new analytical solution for Helmholtz equation in the parabolic coordinate system. This result is expected not only effective for the exploration of functional sub-wavelebgth structures but also to be applied to a wide range of physical phenomena in the future.

    researchmap

  • Enhancement of local electric field in the atto-liter space and its application for ultra sensitive screening tips

    Grant number:23350118  2011.04 - 2014.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    FUKUDA Takashi, ISHIDA Naoyuki, ABE Koji, USHIJIMA Hirobumi, FUKUDA Nobuko, EMOTO Akira

      More details

    Grant amount:\19630000 ( Direct expense: \15100000 、 Indirect expense:\4530000 )

    In this research, it have aimed to fabricate a controlled atto-liter space whose dimension below a sub-wavelength and to confine a plasmon resonance field into the space in order to achieve ultrahigh-sensitive biosensing. Then, we obtained a unique structure fabrication method templating polystylene spherical particles and an appropriate condition for structure replication via nanoimprinting process, and also proved that the local surface plasmon chip exhibits ultra-high sensitivity even for the sample containing a certain contaminant. Moreover, we have developed a prototype testing system consists of palmtop optical measurement apparatus and remote operation terminal that was not included in the original plan of this project, and succeeded to clarify a practical image of the real application. The outcome of the research will lead to the realization of bio-screening testing and point-of-care testing with a feature of label-free, simple, and ultra-high sensitivity.

    researchmap

 

Class subject in charge

  • Seminar in Bioprocess Engineering (2021academic year) Year-round  - その他

  • Interface Science and Technology for Biomaterials (2021academic year) Prophase  - その他

  • Synthetic Chemistry Experiment 1 (2021academic year) Fourth semester  - 月5,月6,月7,月8,木5,木6,木7,木8

  • Synthetic Chemistry Experiment 1 (2021academic year) Fourth semester  - 月5,月6,月7,月8,木5,木6,木7,木8

  • Internship in Applied Chemistry (2021academic year) Prophase  - その他

  • Seminar on Applied Chemistry 1 (2021academic year) Prophase  - その他

  • Seminar on Applied Chemistry 2 (2021academic year) Late  - その他

  • Research Works for Master Thesis on Applied Chemistry (2021academic year) Year-round  - その他

  • Material Process Experiment 1 (2021academic year) Fourth semester  - 月5,月6,月7,月8,木5,木6,木7,木8

  • Material Process Experiment 1 (2021academic year) Fourth semester  - 月5,月6,月7,月8,木5,木6,木7,木8

  • Thermodynamics I (2021academic year) 1st semester  - 水3~4

  • Physical Chemistry and Exercises 1 (2021academic year) 1st semester  - 月3,月4,水1,水2

  • Physical Chemistry 1 (2021academic year) 1st semester  - 月3,月4,水1,水2

  • Physical Chemistry 1 (2021academic year) 1st and 2nd semester  - 水3,水4

  • Physiacal Chemistry A (2021academic year) 1-3 semesters  - [第1学期]水3~4, [第2学期]その他, [第3学期]金3~4

  • Physiacal Chemistry A (2021academic year) 1-3 semesters  - [第1学期]水3~4, [第2学期]その他, [第3学期]金3~4

  • Biotechnology experiment 1 (2021academic year) Fourth semester  - 月5,月6,月7,月8,木5,木6,木7,木8

  • Biotechnology experiment 1 (2021academic year) Fourth semester  - 月5,月6,月7,月8,木5,木6,木7,木8

  • Biointerface Engineering (2021academic year) Prophase  - 木1,木2

  • Seminar in Bioprocess Engineering (2020academic year) Year-round  - その他

  • Interface Science and Technology for Biomaterials (2020academic year) Prophase  - その他

  • Synthetic Chemistry Experiment 1 (2020academic year) Fourth semester  - 月4,月5,月6,月7,木4,木5,木6,木7

  • Synthetic Chemistry Experiment 1 (2020academic year) Fourth semester  - 月4,月5,月6,月7,木4,木5,木6,木7

  • Internship in Applied Chemistry (2020academic year) Prophase  - その他

  • Seminar on Applied Chemistry 1 (2020academic year) Prophase  - その他

  • Seminar on Applied Chemistry 2 (2020academic year) Late  - その他

  • Research Works for Master Thesis on Applied Chemistry (2020academic year) Year-round  - その他

  • Material Process Experiment 1 (2020academic year) Fourth semester  - 月4,月5,月6,月7,木4,木5,木6,木7

  • Material Process Experiment 1 (2020academic year) Fourth semester  - 月4,月5,月6,月7,木4,木5,木6,木7

  • Physical Chemistry and Exercises 1 (2020academic year) 1st semester  - 月3,月4,水1,水2

  • Physical Chemistry 1 (2020academic year) 1st semester  - 月3,月4,水1,水2

  • Biotechnology experiment 1 (2020academic year) Fourth semester  - 月4,月5,月6,月7,木4,木5,木6,木7

  • Biotechnology experiment 1 (2020academic year) Fourth semester  - 月4,月5,月6,月7,木4,木5,木6,木7

  • Biointerface Engineering (2020academic year) Prophase  - 木1,木2

▼display all