研究者詳細 - 亀島　欣一

MISC - 亀島　欣一

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ポストコロナに教育現場で見られる変化招待

亀島欣一

セラミックス 59 ( 8 ) 518 - 519 2024年8月

太陽光発電の現状と課題〜リサイクルに向けた取り組みを中心に〜

亀島欣一

Journal of the Society of Inorganic Materials, Japan 30 ( 423 ) 37 - 39 2023年3月

コロナ禍での教育現場での状況について招待

亀島欣一

セラミックス 56 ( 4 ) 283 - 285 2021年4月

再利用できる酸化チタン系油水分離フィルター査読

西本俊介, 亀島欣一, 三宅通博

加工技術 53 149 - 152 2018年

層状複水酸化物ゲル体からの水浄化のための多孔体の作製

亀島欣一, 渡辺駿一, 西本俊介, 三宅通博, 田中俊行

日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM) 29th 2016年

層状複水酸化物を利用した新規水処理触媒の開発

亀島欣一

研究レポート集２０１４ ( 15 ) 67 - 72 2014年

ハイドロタルサイトの組成分析に活用できる赤外吸収スペクトルのピーク分離法

田中俊行, 玉井博康, 亀島欣一, 西本俊介, 三宅通博

粘土科学討論会講演要旨集 58th 2014年

41 水酸アパタイトによる土壌中のカドミウムの形態変化(関西支部講演会,2012年度各支部会)

三瀬千暁, 西本俊介, 亀島欣一, 三宅通博

日本土壌肥料学会講演要旨集 ( 59 ) 300 - 300 2013年9月

軽量気泡コンクリート材を利用したセシウムイオン交換材料の開発

亀島欣一, 堤卓馬, 西本俊介, 三宅通博

イオン交換学会誌 24 ( 2 ) 46 - 51 2013年

記述言語：日本語出版者・発行元：Japan Society of Ion Exchange

福島第一原子力発電所の事故により環境中に放出されたセシウム等の除去，回収，および固定化に向けた材料が必要とされている。著者らの研究グループでは，トバモライトが主成分である軽量気泡コンクリートを基材としたセシウム吸着・固定化材料を開発してきた。トバモライトを水酸化ナトリウムで処理することで，高いセシウム除去性能が発現する。ここでは，この試料の粉末とバルク体でのセシウム・ストロンチウム除去性能，およびそれらを用いた海水中からのセシウム・ストロンチウムの除去性能について解説する。<br>

DOI： 10.5182/jaie.24.46

炭酸型層状複水酸化物のモノカルボン酸非水溶液を用いた陰イオン交換における溶媒効果

田中俊行, 亀島欣一, 西本俊介, 三宅通博

日本化学会講演予稿集 93rd ( 2 ) 2013年

赤外吸収スペクトルのピーク分離による層状複水酸化物の層間イオンの定量法

田中俊行, 亀島欣一, 西本俊介, 三宅通博

日本化学会講演予稿集 93rd ( 2 ) 2013年

赤外吸収スペクトルのピーク分離によるハイドロタルサイトの層間イオンの定量法

田中俊行, 亀島欣一, 西本俊介, 三宅通博

粘土科学討論会講演要旨集 57th 2013年

層状ペロブスカイトの中温作動固体酸化物燃料電池用カソード電極特性 (特集燃料電池に関連する基礎研究(1))

三宅通博, 西本俊介, 亀島欣一

燃料電池 13 ( 2 ) 7 - 14 2013年

環境とセラミックス : 環境浄化・環境改善に対応したセラミックス材料

亀島欣一

耐火物 = Refractories 64 ( 5 ) 198 - 204 2012年5月

環境材料としてのゼオライト

三宅通博, 松田元秀, 亀島欣一, 西本俊介

セラミックス 47 ( 5 ) 354 - 360 2012年

炭酸型層状複水酸化物のカルボン酸/アルコール溶液を用いた陰イオン交換反応における溶媒効果

田中俊行, 亀島欣一, 西本俊介, 三宅通博

日本化学会講演予稿集 92nd ( 2 ) 2012年

カルボン酸/アルコール溶液中のカルボン酸層状二重水酸化物のアニオン交換反応

TANAKA T., KAMESHIMA Y., NISHIMOTO S., MIYAKE M.

セラミックス基礎科学討論会講演要旨集 50th 2012年

これだけは知っておきたい合成の基礎１：微粉末合成

亀島欣一

平成23年度セラミックス大学ベーシックコーステキスト 49 - 63 2011年

レイヤーバイレイヤー法を用いた層状複水酸化物ナノシート/デンドリマー積層薄膜の作製

田中俊行, 西本俊介, 亀島欣一, 高口豊, 三宅通博

日本化学会講演予稿集 91st ( 2 ) 2011年

未燃炭素含有石炭灰からの活性炭/ゼオライト複合体の合成と吸着特性

田中俊行, 西本俊介, 亀島欣一, 三宅通博

粘土科学討論会講演要旨集 55th 2011年

Asian Clay報告

亀島欣一, 川俣純, 高木慎介, 松枝直人, 福士圭介, 山田裕久

粘土科学 49 ( 2 ) 53 - 61 2010年

光応答デンドリマー/層状複水酸化物複合体の合成と取込量に対するpHの影響

田中俊行, 西本俊介, 亀島欣一, 高口豊, 三宅通博

粘土科学討論会講演要旨集 54th 2010年

LbL法を用いたLDH/機能性デンドリマーハイブリッド薄膜の作製

田中俊行, 西本俊介, 亀島欣一, 高口豊, 三宅通博

セラミックス基礎科学討論会講演要旨集 48th 2010年

層状複水酸化物のデンドリマーに対するイオン交換特性;pH応答性

田中俊行, 西本俊介, 亀島欣一, 高口豊, 三宅通博

日本化学会講演予稿集 90th ( 2 ) 2010年

Nanosized silver-anionic clay matrix as nanostructured ensembles with antimicrobial activity

Gabriela Carja, Yoshikazu Kameshima, Akira Nakajima, Cristian Dranca, Kiyoshi Okada

INTERNATIONAL JOURNAL OF ANTIMICROBIAL AGENTS 34 ( 6 ) 534 - 539 2009年12月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

Nanostructured ensembles of silver nanoparticles/zinc-substituted anionic clay matrix (Ag/ZnLDH) were obtained by a simple synthetic route in which reconstruction of the layered clay, synthesis of the silver nanoparticles and their organisation on the clay surface took place in a single step at room temperature. The morphology, composition and phase structure of the prepared powders were characterised by X-ray diffraction, infrared spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and N(2) adsorption. Results showed that the silver-anionic clay nanoarchitecture consists of nanoparticles of silver (average size 7 nm) deposited on the larger nanoparticles of clay (average size 85 nm). The antimicrobial activity was examined by disk diffusion assay and minimal inhibitory concentration determination as a function of x, where x is a controlled variable parameter that represents the length of time since the sample was synthesised. Ag/ZnLDH showed more stable antimicrobial properties than the unsupported nanosized silver. (C) 2009 Elsevier B.V. and the International Society of Chemotherapy. All rights reserved.

DOI： 10.1016/j.ijantimicag.2009.08.008

Preparation of Pt particles dispersing nanocomposites by thermal treatment of tetrachloroplatinate/layered double hydroxide (LDH)

Yoshikazu Kameshima, Akira Nakajima, Kiyoshi Okada, Toyohiko Yano

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 117 ( 1371 ) 1229 - 1232 2009年11月

記述言語：英語出版者・発行元：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI

Mg-Al LDH intercalated PtCl42- anion (PtCl4-LDH) was synthesized by a reconstruction method using potassium tetrachloroplatinate and its thermal changes were investigated at various temperatures. The PtCl4-LDH included 17 mass% Pt was synthesized by a reconstruction method using K2PtCl4 Solution of 10 mM to adjust the pH with NaOH to about 11. The obtained PtCl4-LDH shows high crystallinity and has low content of CO32-. The basal spacing of the obtained PtCl4-LDH was 0.83 nm expanding slightly from 0.78 nm of starting LDH. The XRD patterns of the obtained PtCl4-LDH showed that the second 001 diffraction line (006) became more accentuated than the first one (003) according to the intercalation of Pt components. Pt fine particles in the several nm were directly observed by TEM after firing at 500 degrees C. However, the diffraction patterns of Pt or Pt components were not detected via XRD in the same sample. This is due to the coagulation of Pt components by the narrow basal spacing of the PtCl4-LDH. (C) 2009 The Ceramic Society of Japan, All rights reserved.

DOI： 10.2109/jcersj2.117.1229

Solid acidities of SiO2-TiO2/montmorillonite composites synthesized under different pH conditions

Yoshikazu Kameshima, Akihiro Yoshizawa, Akira Nakajima, Kiyoshi Okada

APPLIED CLAY SCIENCE 46 ( 2 ) 181 - 184 2009年10月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

SiO2-TiO2/montmorillonite composites were prepared under acidic. neutral and basic conditions and the solid acidity of the resulting composites were determined. All the SiO2/TiO2. ratio of the colloidal particles was set at 10 but the resulting SiO2/TiO2 ratios were significantly richer in TiO2. The XRD patterns of the acidic composite showed expanding and broadening of the (001) reflection by intercalation of colloidal SiO2-TiO2 particles. but the neutral and basic composites showed only broadening of the reflections and no intercalation. The specific surface areas of the acidic. neutral and basic composites (375, 237 and 247 m(2)/g, respectively) were much larger than of montmorillonite (6 m(2)/g). The average pore sizes were about 4.15 and 50 nm. and the amounts of solid acidic sites measured by the NH3-TPD were 178, 95 and 86 mu mol/g for the acidic. neutral and basic composites, respectively. The solid acid amount of the acidic composite was twice that of a commercial catalyst, K-10, (85 mu mol/g) and much higher than the guest phase SiO2-TiO2 gel (16 mu mol/g) or the host phase montmorillonite (6 mu mol/g). The TPD peak temperatures reflect the acid strength, and were similar in all the samples, ranging from 175 degrees to 200 degrees C. (C) 2009 Elsevier B.V. All rights reserved

DOI： 10.1016/j.clay.2009.08.001

Preparation and photocatalytic activity of Keggin-ion tungstate and TiO2 hybrid layer-by-layer film composites

Sayaka Yanagida, Akira Nakajima, Takayoshi Sasaki, Toshihiro Isobe, Yoshikazu Kameshima, Kiyoshi Okada

Applied Catalysis A: General 366 ( 1 ) 148 - 153 2009年9月

記述言語：英語

Keggin ions (PW12O403- (PW12), SiW12O404- (SiW12), H2W12O406- (H2W12)) and TiO2 hybrid thin films were prepared using the layer-by-layer method. Their photocatalytic activities were investigated using gaseous 2-propanol decomposition. All films were transparent in the visible wavelength range. For 2-propanol decomposition, H2W12 was the most effective for the combination with TiO2 despite having the smallest TiO2 deposition amount. The photocatalytic activity of the PW12-TiO2 hybrid film was increased 2.3 times by visible light with UV illumination. This increase was less remarkable for hybrid films of other Keggin ions, suggesting that the visible light excitation of reduced PW12 plays an important role in the enhancement of 2-propanol decomposition. © 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.apcata.2009.06.046

P31 イブプロフェン/層状複水酸化物の作製とイブプロフェンの放出挙動の調査(ポスター発表,一般講演)

桜田雄, 亀島欣一, 磯部敏宏, 中島章, 岡田清

粘土科学討論会講演要旨集 ( 53 ) 196 - 197 2009年9月

B18 Gallate(没食子酸)/層状複水酸化物複合体の作製と評価(口頭発表,一般講演)

亀島欣一, 西本俊介, 三宅通博

粘土科学討論会講演要旨集 ( 53 ) 102 - 103 2009年9月

Measurement of non-DLVO force on a silicon substrate coated with ammonium poly(acrylic acid) using scanning probe microscopy

Toshihiro Isobe, Yosuke Nakano, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi Okada

APPLIED SURFACE SCIENCE 255 ( 20 ) 8710 - 8713 2009年7月

記述言語：英語掲載種別：速報，短報，研究ノート等（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

The repulsive force originating from steric hindrance of polymers in aqueous solvent was investigated using scanning probe microscopy (SPM). The contact angle (CA) of ammonium poly(acrylic acid) (PAA) solution on the Si surface was measured to estimate the state of the Si substrate. Results of CA measurement show that the Si surface was fully covered with PAA at 0.1 mass% in aqueous solution. The interaction force between the Si tip and the wafer was estimated using the SPM force curve mode. The force curve measured in the ion-exchanged purified water showed the typical relation predicted by Derjaguin-Landau-Verway-Overbeek (DLVO) theory. However, the force curve shape in the 0.1 mass% PAA solution was significantly different. Only a repulsive force was observed at less than about 4 nm of separation distance between the Si wafer and cantilever tip. This distance originated from the steric repulsions of PAA adsorbed onto the Si wafer and cantilever tip. Crown Copyright (C) 2009 Published by Elsevier B. V. All rights reserved.

DOI： 10.1016/j.apsusc.2009.06.050

Preparation of solid acid carbon coating on the surface of TiO2 by photo-CVD of gaseous aromatic hydrocarbons

Akira Nakajima, Katsuhiro Horie, Michikazu Hara, Masaaki Kitano, Toshihiro Isobe, Yoshikazu Kameshima, Kiyoshi Okada

CATALYSIS COMMUNICATIONS 10 ( 13 ) 1670 - 1673 2009年7月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

Properties of a solid acid carbon coating prepared on TiO2 powder surface using photochemical vapor deposition (photo-CVD) were evaluated. The TiO2 powder surface became brown during UV illumination under a flowing xylene and xylene sulfonic acid mixture. Observation by TEM revealed an amorphous carbon coating on the TiO2 powder. Sulfonate groups were identified on the coating using FT-IR. A chart of NH3-TPD measurements showed two peaks: that at high temperature was attributed to the coating's strong acid. The carbon coating's acidity was equivalent to that of the solid superacid carbon powder and the carbon-coated TiO2 decomposed cellulose. (C) 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.catcom.2009.05.006

Water retention properties of porous geopolymers for use in cooling applications

Kiyoshi Okada, Asami Ooyama, Toshihiro Isobe, Yoshikazu Kameshima, Akira Nakajima, Kenneth J. D. MacKenzie

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 29 ( 10 ) 1917 - 1923 2009年7月

記述言語：英語出版者・発行元：ELSEVIER SCI LTD

A series of geopolymers were prepared with varying ratios of sodium silicate, metakaolinite, NaOH and H(2)O and their porous properties, water retention and mechanical properties were determined, to develop materials for counteracting heat island effects. Samples were prepared with the molar ratios SiO(2):Al(2)O(3):Na(2)O:H(2)O of 3.66:1:x:y, where x = 0.92-1.08 and y = 14.2-19.5. The porous and mechanical properties of the geopolymers showed a good correlation with the H(2)O/Al(2)O(3) ratio (y); an increase in y produced an increase in the pore volume (from 0.26 to 0.46 ml/g), the pore size (from 15 to 390 nm) and the water absorption (from 27.2 to 51.1%). The same increase in y decreased the bulk density (from 1.29 to 0.99 g/cm(3)), the bending strength (from 14.2 to <5 MPa) and the water retention. Thus, the H(2)O/Al(2)O(3) ratio is the most important factor for controlling the porous properties of these materials, since geopolymers with higher H(2)O/Al(2)O(3) ratios are more porous and have higher water absorption rates, making them suitable as materials for surface cooling by water evaporation. Geopolymers with lower H(2)O/Al(2)O(3) ratios are more suitable for water retention applications, and have the advantage of higher mechanical strength. (C) 2008 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.jeurceramsoc.2008.11.006

Preparation and properties of TiO2/montmorillonite composites

Yoshikazu Kameshima, Yoshihiro Tamura, Akira Nakajima, Kiyoshi Okada

APPLIED CLAY SCIENCE 45 ( 1-2 ) 20 - 23 2009年6月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

TiO2/montmorillonite composites were prepared by reaction of montmorillonite with a TiO2 Sol formed by hydrolyzing titanium iso-propoxide, at 50-80 degrees C. The composites showed expanding and broadening of the basal reflections of montmorillonite indicating a partial intercalation of the smaller colloidal TiO2 particles and increased disorder. The reaction temperature affected largely the amount of TiO2 hydrolyzed and the resulting pore sizes. Both properties increased with increasing reaction temperature: the TiO2 content from 24.2 to 46.6 mass% and the average pore size from 2 to 20 nm. The colloidal TiO2 particles consisted of anatase up to 1000 degrees C without transforming into rutile. The growth of the TiO2 particles was suppressed by the montmorillonite particles. Adsorption of methylene blue (MB) was higher in the composite prepared at 80 degrees C than in that at 50 degrees C because of the larger pore size. Photocatalytic decomposition of 1,4-dioxane by the composites was higher than for pure anatase due to the synergy effect of adsorption for 1,4-dioxane and photodecomposed intermediates by montmorillonite and its photodecomposition by TiO2. (C) 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.clay.2009.03.005

Droplet Size Dependence of Line Tension for an Ionic Liquid on a Smooth Silane Coating

Tsutomu Furuta, Akira Nakajima, Munetoshi Sakai, Toshihiro Isobe, Yoshikazu Kameshima, Kiyoshi Okada

CHEMISTRY LETTERS 38 ( 6 ) 580 - 581 2009年6月

記述言語：英語出版者・発行元：CHEMICAL SOC JAPAN

Line tension was measured for microliter-scale and subnanoliter-scale droplets of an ionic liquid on a highly smooth and homogeneous fluoroalkylsilane coating. Values for microliter-scale droplets were two orders larger than those for subnanoliter-scale droplets despite their identical combinations of solid surfaces and liquid. Scale factors related to this measurement and hydrostatic pressure from the liquid play an important role in the discrepancy.

DOI： 10.1246/cl.2009.580

Evaporation and Sliding of Water Droplets on Fluoroalkylsilane Coatings with Nanoscale Roughness

Tsutomu Furuta, Akira Nakajima, Munetoshi Sakai, Toshihiro Isobe, Yoshikazu Kameshima, Kiyoshi Okada

LANGMUIR 25 ( 10 ) 5417 - 5420 2009年5月

記述言語：英語出版者・発行元：AMER CHEMICAL SOC

Evaporation and sliding behaviors of water droplets were investigated on smooth and rough fluoroalkylsilane coatings. The rough coating possesses nanoscale roughness and chemical heterogeneity on its surface. Evaporation behaviors for these two coatings differed when nanoliter-scale droplets were used, although they were nearly identical for rnicroliter-scale droplets. The droplets on the smooth coating exhibit greater sliding acceleration and a larger slipping velocity ratio than those on the rough coating. Both the evaporation behavior of nanoliter-scale droplets and sliding velocity of microliter-scale droplets were affected by nanoscale surface heterogeneity. They are indicators for highly homogeneous smooth silane coatings.

DOI： 10.1021/la8040665

Preparation and abrasion resistance of transparent super-hydrophobic coating by combining crater-like silica films with acicular boehmite powder

Tomoki Yanagisawa, Akira Nakajima, Munetoshi Sakai, Yoshikazu Kameshima, Kiyoshi Okada

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS 161 ( 1-3 ) 36 - 39 2009年4月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

A super-hydrophobic coating was prepared by combining a rigid base film with crater-like hemispherical holes and acicular nanoparticles. The acicular boehmite powder provides a high contact angle on the film surface. The rigid base film with crater-like hemispherical holes inhibits the rapid decrease of contact angle by surface rubbing. The combination of different roughness is an effective method for improving the abrasion resistance of super-hydrophobic films. (C) 2008 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.mseb.2008.11.016

Dependence of photoinduced surface friction force variation on UV intensity and atmosphere in polycrystalline TiO2 thin films

Naoki Arimitsu, Akira Nakajima, Toshiya Watanabe, Yoshikazu Kameshima, Kiyoshi Okada

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 203 ( 2-3 ) 155 - 160 2009年4月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE SA

Anatase polycrystalline thin films and a plasma crystallization process were used to investigate the dependence of the photoinduced friction force variation for a TiO2 Surface on the UV intensity and atmosphere. Photoinduced friction force variation for UV illumination time was divisible into two stages, decreasing and increasing, where the switching time between these two stages and the degree of variation depended oil the UV intensity and atmosphere. The decreasing stage was attributable to the photocaralytic decomposition of organic compound adsorbed onto the Surface, whereas the increasing stage was attributed to the capillary effect or an increase in the adsorbed water layer. Results demonstrated that UV intensity and atmosphere controlled the friction force. (C) 2009 Elsevier B.V. All lights reserved.

DOI： 10.1016/j.jphotochem.2009.01.009

Low temperature preparation and machinability of porous ceramics from talc and foamed glass particles

Kiyoshi Okada, Fumihiko Ikawa, Toshihiro Isobe, Yoshikazu Kameshima, Akira Nakajima

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 29 ( 6 ) 1047 - 1052 2009年4月

記述言語：英語出版者・発行元：ELSEVIER SCI LTD

Porous ceramics were prepared by firing mixtures of talc (Mg(3)Si(4)O(10)(OH)(2)) and foamed glass particles (ceramic balloons, CB) with and without LiCl as a sintering acid. The mixing ratios of the starting materials were talc:CB = 7:3, 8:2, 9:1 and 10:0, with additions of LiCl of 0, 2 and 5 mass%. The mixtures were formed into pellets and fired at 600-1000 degrees C. The pellets without LiCl showed very poor strength even when fired at 1000 degrees C but those containing LiCl were much stronger, even when fired at only 600 degrees C. The crystalline phases in these samples changed to enstatite (MgSiO(3)) at >= 700 degrees C by decomposition of the talc under the fluxing action of the LiCl. The resulting samples were machinable and easily cut and drilled. The cutting rate decreased with increasing bending strength, for example, from 105 mm(2)/s and 6.3 MPa to 50 mm(2)/s and 16.3 MPa, respectively. The drilling rate of the present sample was found to be only slightly less than Teflon (polytetrafluoroethylene, PTFE) but much faster than graphite, glass ceramics, etc. (C) 2008 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.jeurceramsoc.2008.07.055

Bioactivity and mechanical properties of CaSiO3/high-density polyethylene (HDPE) composites prepared by a new surface loading method of CaSiO3 powder

Kiyoshi Okada, Miho Tanuma, Yoshikazu Kameshima, Akira Nakajima, Shigeo Asai, Masao Sumita

MATERIALS RESEARCH BULLETIN 44 ( 2 ) 298 - 305 2009年2月

記述言語：英語出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

CaSiO3/high-density polyethylene (HDPE) composites with flexibility and biocompatibility were prepared by a new surface loading method. CaSiO3 powder was synthesized by coprecipitation method with heating at 1300 degrees C for 2 h. The obtained alpha-CaSiO3 powder was sieved to 45-75 mu m (sample M) and 75-150 mu m (sample C). Fine powder sample (sample F) was prepared by grinding the powder being the average particle size of 2.9 mu m. These powders were sprinkled on the melted HDPE sheets heated at 160, 180 and 200 degrees C. The amounts of sprinkled powder were only <0.1 vol.% but the ratios of surface coverage area were >50% in all the samples. Apatite formation in simulated body fluid (SBF) was observed by soaking for 5 days in sample F while within 1 day in samples M and C. The sample M retained flexible properties of HDPE together with excellent biocompatible properties. (C) 2008 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.materresbull.2008.06.011

Preparation and properties of titania-Cs2.5H0.5PW12O40 hybrid films

Akira Nakajima, Shunsuke Matsui, Sayaka Yanagida, Yoshikazu Kameshima, Kiyoshi Okada

SURFACE & COATINGS TECHNOLOGY 203 ( 9 ) 1133 - 1137 2009年1月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE SA

Using continuous coating with Si-alkoxide as a binder, Cs2.5H0.5PW12O40 (Cs2.5) powder was prepared and immobilized onto a Pyrex glass plate. The Cs2.5 coating possessed an acid site on the film surface. Translucent TiO2-Cs2.5 hybrid films were prepared by laminating TiO2 films with holes on the Cs2.5 coating using phase-separation of alkoxide. Photocatalytic decomposition of 1,4-dioxane in water revealed that the holes serve as adsorption fields for ethylene glycol diformate, an intermediate with poor affinity to TiO2. The TiO2-Cs2.5 hybrid films produced by this process are candidates for purification of water containing several chemicals with a slow decomposition rate in photocatalysis. (C) 2008 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.surfcoat.2008.10.010

Effect of Surface Structure on the Sustainability of an Air Layer on Superhydrophobic Coatings in a Water-Ethanol Mixture

Munetoshi Sakai, Tomoki Yanagisawa, Akira Nakajima, Yoshikazu Kameshima, Kiyoshi Okada

LANGMUIR 25 ( 1 ) 13 - 16 2009年1月

記述言語：英語出版者・発行元：AMER CHEMICAL SOC

Using a laser beam and its reflection, we evaluated surface air layers on two superhydrophobic coatings with different roughnesses (R(a) = 1900 and 74 nm) in a water-ethanol mixture. The reflected laser intensity decreased by increasing the ethanol concentration for the superhydrophobic coating with large roughness because of increased scattering by the surface structure of the solid. However, it was almost constant and slightly increased for the coating with small roughness, probably because the liquid-air interface becomes flatter as the liquid intrudes into the surface structure. Results demonstrated that the difference in surface structure provides different sustainability of the surface air layer.

DOI： 10.1021/la802763h

Photocatalytic destruction of 1,4-dioxane in aqueous system by surface-roughened tio2 coating on stainless mesh

Sayaka Yanagida, Akira Nakajima, Yoshikazu Kameshima, Kiyoshi Okada

Key Engineering Materials 412 137 - 141 2009年

記述言語：英語

This study investigated the effect of surface roughness on a coating of TiO2 submicron powders that had been applied on a stainless steel mesh using electrophoretic deposition (EPD). Roughness was provided to the surface of EPD coating using UV pre-illumination to the suspension prepared by isopropyl alcohol and commercial TiO2 powder. The Ra value was increased around 20% by this treatment. The rough coating provided a higher photocatalytic decomposition rate of 1,4-dioxane in water than a smooth coating obtained from the suspension without UV pre-illumination. That increase is attributable to the increase of the reaction field on the coating surface.

DOI： 10.4028/www.scientific.net/KEM.412.137

Photocatalytic destruction of 1,4-dioxane in aqueous system by surface-roughened TiO(2) coating on stainless mesh

Sayaka Yanagida, Akira Nakajima, Yoshikazu Kameshima, Kiyoshi Okada

ELECTROPHORETIC DEPOSITION: FUNDAMENTALS AND APPLICATIONS III 412 137 - 141 2009年

記述言語：英語出版者・発行元：TRANS TECH PUBLICATIONS LTD

This study investigated the effect of surface roughness on a coating of TiO(2) submicron powders that had been applied on a stainless steel mesh using electrophoretic deposition (EPD). Roughness was provided to the surface of EPD coating using UV pre-illumination to the suspension prepared by isopropyl alcohol and commercial TiO(2) powder. The R(a) value was increased around 20% by this treatment. The rough coating provided a higher photocatalytic decomposition rate of 1,4-dioxane in water than a smooth coating obtained from the suspension without UV pre-illumination. That increase is attributable to the increase of the reaction field on the coating surface.

DOI： 10.4028/www.scientific.net/KEM.412.137

Preparation and electrochemical property of manganese oxide/carbon composites

Y. Kameshima, H. Wagata, A. Nakajima, K. Okada

Journal of Physics: Conference Series 191 12015 2009年

記述言語：英語出版者・発行元：Institute of Physics Publishing

A novel electro-chemical capacitor was tried to synthesis by assemble carbon powder with manganese oxide using an ultra-sonication in KMnO4 solution. (ultrasonic sample). A reference sample was prepared by same condition except for radiation of ultra-sonication (settle sample). Both ultrasonic sample and settle sample show the composite of manganese oxide and carbon. Additionally, layered manganese oxide phase was observed in the ultrasonic samples. Surface atomic ratio of Mn/C decreased corresponding with increasing of used solution volume from 25 ml to 250 ml. The composite prepared using 100ml solution was greatly affected by the ultra-sonication. On the other hand, the amount of manganese on the surface has increased with the increasing of the irradiation of energy among the ultrasonic sample. The amount of manganese deposition was almost saturated with 100 mW/cm3. Cyclic voltammetry curves of the obtained composites were influenced by scanning speed. The ultrasonic sample shows higher electrical capacitance than the settle sample in various conditions. © 2009 IOP Publishing Ltd.

DOI： 10.1088/1742-6596/191/1/012015

Preparation of Pt particles dispersing nanocomposites by thermal treatment of tetrachloroplatinate/layered double hydroxide

Y. Kameshima, A. Nakajima, K. Okada, T. Yano

J. Ceram. Soc. Jpn. 117 ( 1371 ) 1229 - 1232 2009年

P57 多孔性を利用したメソポーラスシリカ/チタニア複合体の作製(ポスター討論)

吉澤章博, 磯部敏宏, 亀島欣一, 中島章, 岡田清

粘土科学討論会講演要旨集 ( 52 ) 270 - 271 2008年9月

B17 タルクを用いたマシナブルセラミックスの作製(口頭発表,一般講演)

岡田清, 井川史彦, 磯部敏宏, 亀島欣一, 中島章

粘土科学討論会講演要旨集 ( 52 ) 118 - 119 2008年9月

P23 ケイ皮酸ナトリウム/層状複水酸化物複合体の作製と紫外線照射の影響(ポスター討論)

中田綾, 亀島欣一, 磯部敏宏, 中島章, 岡田清

粘土科学討論会講演要旨集 ( 52 ) 202 - 203 2008年9月

A13 テトラクロロ白金酸/層状複水酸化物複合体の作製と評価(口頭発表,一般講演)

亀島欣一, 中島章, 岡田清

粘土科学討論会講演要旨集 ( 52 ) 56 - 57 2008年9月

P58 多孔性ジオポリマーの作製とその保水特性の評価(ポスター討論)

大山朝美, 磯部敏宏, 亀島欣一, 中島章, 岡田清

粘土科学討論会講演要旨集 ( 52 ) 272 - 273 2008年9月

Preparation of barium titanate nanoparticle sphere arrays and their dielectric properties

Satoshi Wada, Aki Yazawa, Takuya Hoshina, Yoshikazu Kameshima, Hirofumi Kakemoto, Takaaki Tsurumi, Yoshihiro Kuroiwa

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL 55 ( 9 ) 1895 - 1899 2008年9月

記述言語：英語出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Barium titanate (BaTiO3) nanoparticles from 27 to 192 nm were prepared by the 2-step thermal decomposition method from barium titanyl oxalate nanoparticles. These particles were dispersed well into 1-propanol, and dense BaTiO3 nanoparticle sphere arrays without stress-field were prepared by the meniscus method. Temperature dependence of dielectric properties was successfully measured using these dense nanoparticle sphere arrays, and size effect on dielectric properties was discussed.

DOI： 10.1109/TUFFC.880

Effect of the crystallinity of kaolinite precursors on the properties of mesoporous silicas

Myoshi Okada, Hisako Yoshizaki, Yoshikazu Kameshima, Akira Nakajima

APPLIED CLAY SCIENCE 41 ( 1-2 ) 10 - 16 2008年9月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

Mesoporous silicas (MesoPSs) were hydrothermally synthesized from calcined and selectively acid-leached kaolinites with a range of crystallinity, using cetyltrimethyl ammonium bromide (CTABr), to investigate the effect of the kaolinite crystallinity on the porous properties of the resulting MesoPSs. Four kaolinites were used, with Hinckley indices ranging from 0.51 to 1.20 and (001) crystallite sizes ranging from 20 to 37 nm. After calcination at 600 degrees C for 24 h they were selectively leached with 2.5 M H(2)SO(4) at 90 degrees C for 2 h to prepare microporous silica (MicroPSs). The Si/Al ratios of these MicroPSs varied from 21 to 82 and their specific surface areas (S(BET)) ranged from 169 to 370 m(2)/g, these parameters tending to increase with decreasing Hinckley index of the kaolinite. MesoPSs were synthesized by reacting the resulting MicroPSs with CTABr in NaOH solution under hydrothermal conditions. The MicroPS was mixed with CTABr, NaOH and water in the molar ratio (MicroPS):CTABr:NaOH:H(2)O = 1:0.1:0.3:150. The synthesis was carried out by stirring the suspension at room temperature for 24 h, aging for 24 h, hydrothermal treatment at 110 degrees C for 24 h and calcination at 560 degrees C for 6 h to remove the surfactants. The S(BET) values of the resulting MesoPSs ranged from 932 to 1240 m(2)/g, correlating with the S(BET) values of the precursor MicroPS and the crystallinity of the kaolinite starting materials. (C) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.clay.2007.09.009

Utilization of steel-making slag for the uptake of ammonium and phosphate ions from aqueous solution

Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi Okada

JOURNAL OF HAZARDOUS MATERIALS 156 ( 1-3 ) 156 - 162 2008年8月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

Steel-making slag, a waste by-product of the Steel Industry, constitutes a major disposal problem. In the present study, excellent adsorbent materials for reducing eutrophication in wastewaters have been prepared from this slag. Heated samples of acid-treated slag and mixtures of slag with kaolinite and Al(OH)(3) were examined to determine their uptake capacities for NH4+ and PO43- from aqueous solutions. In general, the equilibrium pH of the solution increased in comparison to initial pH with the uptake of target ions, the sample activated slag-Al(OH)(3) showing the smallest change. The highest PO43- uptake capacity was obtained with the slag-Al(OH)(3) mixture heated at 900 degrees C whereas the highest uptake of NH4+ was found in the slag-Al(OH)(3) mixture heated at 800 degrees C. The uptake rates for PO43- and NH4+ by the slag-Al(OH)(3) mixture heated at 900 degrees C were 2.91 and 0.65 mu mol/(g min), respectively. It was shown that heating slag composites prior to incorporation into wastewater treatment filters resulted in an increased degree of NH4+ and PO43- uptake. (C) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jhazmat.2007.12.009

Processing and properties of transparent sulfated TiO(2) thin films using sol-gel method

Akira Nakajima, Aiko Nakamura, Naoki Arimitsu, Yoshikazu Kameshima, Kiyoshi Okada

THIN SOLID FILMS 516 ( 18 ) 6392 - 6397 2008年7月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE SA

For this study, transparent sulfated TiO(2) thin films were prepared from Ti alkoxide. Vacuum ultraviolet illumination in air at 180 degrees C was demonstrated to be an effective pretreatment for reproducible preparation of crack-free sulfated TiO(2) thin films. The film provides a high photoinduced wettability conversion rate and photocatalytic decomposition efficiency on gaseous n-hexane under proper conditions. This result is attributable to the accelerated decomposition of intermediates by a strong inorganic acid on the surface or to the resultant high quantum yield by suppressing the recombination between electrons and holes on the film surface. (c) 2008 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.tsf.2007.12.161

Effect of liquid viscosity on the internal fluidity of a droplet sliding on a fluoroalkylsilane coating

Yuu Sakurada, Shunsuke Suzuki, Munetoshi Sakai, Akira Nakajima, Yoshikazu Kameshima, Kiyoshi Okada

CHEMISTRY LETTERS 37 ( 7 ) 688 - 689 2008年7月

記述言語：英語出版者・発行元：CHEMICAL SOC JAPAN

The effect of liquid viscosity on the internal fluidity of droplets during sliding on an inclined Si surface treated with fluoroalkylsilane (FAS) was investigated for water-glycerin mixture using particle image velocimetry (PIV). Increasing viscosity remarkably decreases the slipping motion on the solid-liquid interface and overall sliding acceleration. It affects the rolling motion, but its degree of influence is smaller than that on slipping. The viscosity had different contributions to slipping and rolling motions of the droplets.

DOI： 10.1246/cl.2008.688

Processing and photocatalytic properties of transparent 12 tungsto(VI) phosphoric acid - TiO(2) hybrid films

Sayaka Yanagida, Akira Nakajima, Takayoshi Sasaki, Yoshikazu Kameshima, Kiyoshi Okada

CHEMISTRY OF MATERIALS 20 ( 11 ) 3757 - 3764 2008年6月

記述言語：英語出版者・発行元：AMER CHEMICAL SOC

Using the layer-by-layer method, 12 tungsto(VI) phosphoric acid (PW(12)) and TiO(2) hybrid thin films were prepared. In 2-propanol decomposition, two-bilayer thin films (ca. 15 nm) showed more rapid decomposition than control TiO(2) and PW(12) films under both UV and Visible light illumination. Visible light illumination was required for continuous 2-propanol decomposition. Photocatalytic decomposition activity depends on the number of bilayer coatings, the top coating, and the organic compounds for decomposition. On the basis of the wavelength dependence of the hybrid thin films, a reaction scheme for this system was discussed.

DOI： 10.1021/cm800167x

Effect of atmosphere on photo-induced friction force variation on (001) rutile

Akira Nakajima, Aya Nakada, Naoki Arimitsu, Yoshikazu Kameshima, Kiyoshi Okada

MATERIALS LETTERS 62 ( 8-9 ) 1319 - 1321 2008年3月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

Variations of friction force and surface potential were evaluated using friction force microscopy (FFM) and Kelvin force microscopy (KFM) on (100) and (001) faces of rutile single crystals under UV illumination in three different atmospheres: dry nitrogen, dry air, and ambient air. Friction force and surface roughness for the (100) face did not exhibit remarkable dependence on either UV illumination or on the atmosphere. However, the friction force of the (001) face increased by UV illumination in dry air without roughness variation. The surface potential of the (001) face changed negatively and more remarkably than that of the (100) face by UV illumination. (C) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.matlet.2007.08.036

Water-retention properties of porous ceramics prepared from mixtures of allophane and vermiculite for materials to counteract heat island effects

Kiyoshi Okada, Shunsuke Matsui, Toshihiro Isobe, Yoshikazu Kameshima, Akira Nakajima

CERAMICS INTERNATIONAL 34 ( 2 ) 345 - 350 2008年3月

記述言語：英語出版者・発行元：ELSEVIER SCI LTD

Porous ceramics for anti-heat island effect were prepared from mixtures of allophane and vermiculite (VA samples). Allophane and vermiculite which had been ground for 0.5-2 h was mixed in various mass ratios, formed into pellets by uniaxial pressing at 40 MPa, and heated at 600-800 degrees C to form porous ceramics. The large thermal expansion of the vermiculite upon explosive dehydration of interlayer water causes cracking of the pellets with higher vermiculite contents. However, this can be controlled by grinding the vermiculite prior to heating. Grinding the vermiculite for >= 2 It suppresses its expansion, enabling pellet samples with high vermiculite contents to be prepared without cracking. The bulk densities of samples prepared at 800 degrees C from vermiculite ground for 2 h decrease from 1.72 to 0.94 with increasing allophane content. The pore size distribution in these samples shows a distinct peak at about 1 mu m irrespective of the mixing ratio. The number of smaller pores (50 nm) increases with increasing allophane content while the number of larger pores (20-40 mu m) increases with increasing vermiculite content. The compressive strengths of the samples range from I to 3 MPa except for samples containing a high proportion of vermiculite ground for I h. The water absorption (W-a) of the samples increases from 37 to 63% with increasing allophane content. This absorption rate is fast enough to absorb >90% of the W-a within 1 min for samples of 10 mm phi x 5 mm(3) size. By contrast, the release of the absorbed water is very slow, with 50% of the W-a retained for >= 30 h in the VA samples at a relative humidity of 55% at 20 degrees C this is slower than in pure allophane and much slower than in a reference sample of foamed glass (about 4 h). All these properties make the VA samples useful as water-retaining materials to combat "heat island" effects. (c) 2006 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

DOI： 10.1016/j.ceramint.2006.10.006

Preparation and sorption properties of materials from paper sludge

M. Hojamberdiev, Y. Kameshima, A. Nakajima, K. Okada, Z. Kadirova

JOURNAL OF HAZARDOUS MATERIALS 151 ( 2-3 ) 710 - 719 2008年3月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

Three materials were prepared from paper sludge (PS) using different treatment processes and their sorption abilities for phosphate and methylene blue (MB) were determined. The samples were a powder sample prepared by heating PS in air (sample C), a pellet prepared by grinding, forming and heating PS in air (sample G) and a powder prepared by physical activation of PS in flowing wet nitrogen (sample A). The three samples were heated at 600-900 degrees C for 6h. On heating at 700-800 degrees C, the organic fibers, limestone (CaCO3) kaolinite (Al2Si2O5(OH)(4)) and talc (Mg3Si4O10(OH)(2)) in the original PS were converted to amorphous CaO-Al2O3-SiO2 (CAS) and talc in sample C, while CAS was formed in sample G and activated carbon, CAS and talc was formed in sample A. On heating at 900 degrees C the CAS converted to gehlenite (Ca2Al2SiO7) and anorthite (CaAl2Si2O8). The specific surface areas (SBET) of the three samples achieved maximum values of 23, 37 and 70 m(2)/g upon heating at 700, 600 and 600 degrees C, respectively. The SBET value of the activated sample A was distinctly lower than usually reported for activated carbon. The samples C, G and A achieved maximum phosphate sorption capacities of 2.04, 1.38 and 1.70 mmol/g, calculated from the Langmuir model, upon heating at 700, 700 and 800 C, respectively. The maximum sorption capacity for phosphate in sample C is attributed to the sorption by CAS, namely, adsorption on the alumina component and precipitation as Ca-phosphates. The MB multifunctional sorption capacity of sample A was 0.11 mmol/g. The phosphate and MB sorption rates show better correlation with a pseudo-second order model than with other models. (C) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jhazmat.2007.06.058

Preparation and simultaneous ion uptake properties of CaO-Fe2O3-SiO2 compounds

Atsushi Kobayashi, Fahmida Gulshan, Yoshikazu Kameshima, Akira Nnakajima, Kiyoshi Okada

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 116 ( 1350 ) 187 - 191 2008年2月

記述言語：英語出版者・発行元：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI

CaO-Fe2O3-SiO2 (CFS) compounds were prepared from mixtures of Ca(OH)(2), FeOOH and SiO2 and their simultaneous uptake properties for cations and anions were investigated. The starting powders were mixed in various ratios using a planetary ball mill and heated at various temperatures in air and flowing N-2 atmospheres. Amorphous compounds were formed by heating up to <600 degrees C while hematite (alpha-Fe2O3) was crystallized at >= 600 degrees C and calcium silicates and/or calcium iron silicates at >= 800 degrees C. Simultaneous ion uptake experiments were carried out by a batch method using solutions containing same concentrations of Ni2+, NH4+ and H2PO4-. The samples heated at 600 degrees C showed the highest ion uptake ability. The uptake abilities were higher for Ni2+ and H2PO4- than for NH4+ and increased with increasing CaO content in the CFSs. The uptake abilities for three ions enhanced by heating the samples in flowing N-2. The simultaneous uptake mechanisms are thought to be similar to those observed in the CAS compounds, i.e. ligand change (Ca2+ -> Ni2+), compound precipitation and adsorption. The CFS compounds have the following advantages compared with CaO-Al2O3-SiO2 (CAS); (1) higher uptake ability for phosphate ions (a model for harmful oxyanions) and (2) easy separation of a contaminated sorbent from the solution after uptake using a magnet.

DOI： 10.2109/jcersj2.116.187

Voltage swing interval effects on photocatalytic decomposition of 1,4-dioxane in aqueous media using TiO2-coated stainless mesh

Sayaka Yanagida, Akira Nakajima, Yoshikazu Kameshima, Kiyoshi Okada

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 116 ( 1350 ) 181 - 186 2008年2月

記述言語：英語出版者・発行元：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI

This study investigates the effects of a voltage swing interval on 1,4-dioxane decomposition in aqueous media. The concentration of 1,4-dioxane decreases with the decreasing voltage swing interval, but the change is small. In contrast, the concentration of EGDF increases with the decreasing interval. Its difference is much greater than that of 1,4-dioxane. These results suggest that the diffusion constant of EGDF in a pore structure differs from that of 1,4-dioxane and that the response to the voltage swing interval depends on the chemical species. For effective water purification using this system, proper material design and optimization of operation conditions are necessary.

DOI： 10.2109/jcersj2.116.181

Sliding behavior of water droplets on line-patterned hydrophobic surfaces

Shunsuke Suzuki, Akira Nakajima, Kouichi Tanaka, Munetoshi Sakai, Ayako Hashimoto, Naoya Yoshida, Yoshikazu Kameshima, Kiyoshi Okada

APPLIED SURFACE SCIENCE 254 ( 6 ) 1797 - 1805 2008年1月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

We prepared line-patterned hydrophobic surfaces using fluoroalkylsilane (FAS) and octadecyltrimethoxysilane (ODS) then investigated the effect of line direction on sliding behavior of water droplets by direct observation of the actual droplet motion during sliding. Water droplets slide down with a periodic large deformation of the contact line and sliding velocity fluctuation that occurred when they crossed over the 500-mu m ODS line regions in FAS regions on a Si surface tilted at 35 degrees. These behaviors are less marked for motion on a 100-mu m line surface, or on lines oriented parallel to the slope direction. Smaller droplets slide down with greater displacement in the line direction on 500-mu m line patterning when the lines were rotated at 13 degrees in-plane for the slope direction. This sliding behavior depended on the droplet size and rotation angle, and is accountable by the balance between gravitational and retentive forces. (C) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.apsusc.2007.07.171

Slipping and rolling ratio of sliding acceleration for a water droplet sliding on fluoroalkylsilane coatings of different roughness

Shunsuke Suzuki, Akira Nakajima, Munetoshi Sakai, Yuu Sakurada, Naoya Yoshida, Ayako Hashimoto, Yoshikazu Kameshima, Kiyoshi Okada

CHEMISTRY LETTERS 37 ( 1 ) 58 - 59 2008年1月

記述言語：英語出版者・発行元：CHEMICAL SOC JAPAN

The effect of surface roughness on the internal fluidity of a water droplet during sliding on an inclined Si surface treated fluoroalkylsilane (FAS) was investigated using particle image velocimetry (PIV). A water droplet slid down by caterpillar-like rotation flow with or without slippage on the solid-liquid interface. The slipping/rolling ratio on the sliding acceleration depended on the surface roughness; the droplet advanced on the rough surface mainly by the rolling mechanism.

DOI： 10.1246/cl.2008.58

Direct Measurement of the Motion of Water Droplets on a Hydrophobic Self-assembled Monolayer Surface under Airflow

A. Hashimoto, M. Sakai, N. Yoshida, S. Suzuki, Y. Kameshima, A. Nakajima

J. Surf. Finishing Soc. Jpn. 59 ( 12 ) 907 - 912 2008年

記述言語：英語出版者・発行元：一般社団法人表面技術協会

A wind tunnel to produce a uniform air stream and a high-speed camera system assembled for this study enabled direct and simultaneous measurements of sliding droplets' shape and acceleration. Using this system, wind velocity dependence of deformation and the moving acceleration of a water droplet on an inclined octadecyltrimethoxysilane (ODS) coating were investigated. The motions of a water droplet in an air stream are classifiable into three : sliding, stopping, and climbing. In the sliding zone, the sliding acceleration decreases with increasing wind velocity. During stopping, the droplet shape changes from a forward-bent to backward-bent posture against the surface inclination. In the climbing zone under large wind velocity, water droplets have large climbing acceleration with large shape deformation.

DOI： 10.4139/sfj.59.907

高酸量の酸化物ゾル／スメクタイト複合体の作製

亀島欣一, 岡田清

化学工業 59 ( 5 ) 337 - 342 2008年

Properties of TiO2 prepared by acid treatment of BaTiO3

Kiyoshi Okada, Tomoki Yanagisawa, Yoshikazu Kameshima, Akira Nakajima

MATERIALS RESEARCH BULLETIN 42 ( 11 ) 1921 - 1929 2007年11月

記述言語：英語出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

TiO3 powders were prepared by acid treatment of BaTiO3 and their properties were investigated. The BaTiO3 powder was subjected to HNO3 in concentrations ranging from 10(-3) to 8 M at 90 degrees C for 0.5-6 h. Dissolution of BaTiO3 and precipitation of TiO2 occurred at acid concentrations of 2-5 M. BaTiO3 dissolves completely to form a clear solution at reaction times of 0.5-1 h, but a rutile precipitate is formed after 2 h of acid treatment. By contrast, anatase is precipitated by adjusting the pH of the clear solution to 2-3 using NaOH or NH4OH solution. The rutile crystals were small and rod-shaped, consisting of many small coherent domains connected by grain boundaries with small inclination angles and edge dislocations, giving them a high specific surface area (S-BET). With increasing HNO3 concentration, the SBET value increased from 100 to 170 m(2)/g while the crystallite size decreased from 25 to 11 nm. The anatase crystals obtained here were very small equi-axial particles with a smaller crystallite size than the rutile and S-BET values of about 270 m(2)/g (higher than the rutile samples). The photocatalytic activity of these TiO3 was determined from the decomposition rate of Methylene Blue under ultraviolet irradiation. Higher decomposition rates were obtained with larger crystallite sizes resulting from heat treatment. The maximum decomposition rates were obtained in samples heated at 500-600 degrees C. The photocatalytic activity of the TiO3 was found to depend more strongly on the sample crystallite size than on S-BET. (C) 2006 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.materresbull.2006.12.011

Synthesis and characterization of mesoporous silica from selectively acid-treated saponite as the precursors

Kiyoshi Okada, Hisako Yoshizaki, Yoshikazu Kameshima, Akira Nakajima, Chengala D. Madhusoodana

JOURNAL OF COLLOID AND INTERFACE SCIENCE 314 ( 1 ) 176 - 183 2007年10月

記述言語：英語出版者・発行元：ACADEMIC PRESS INC ELSEVIER SCIENCE

Mesoporous silicas were synthesized by hydrothermal treatment of selectively acid-treated saponite (an ideal structural formula: Na1/3Mg3-(Si11/3Al1/3)O-10(OH)(2)), having a 2:1 type layered structure as the silica source and its porous properties were examined and compared with that from kaolinite (an ideal structural formula: Al2Si2O5(OH)(4)), having a 1:1 type layered structure. Synthetic saponite was selectively leached in H2SO4 solutions with various concentrations (0.05-1 M) at 70 degrees C for 0.5 h. The resulting products (precursors) were mixed with cetyltrimethylammonium bromide (CTABr), NaOH and H2O, hydrothermally treated at 110 degrees C and removed the CTABr by calcining at 560 degrees C. A hexagonal mesoporous phase was obtained with higher Si/(Al(+Mg)) ratios of the resulting precursors. The XRD patterns of these products show the peaks assigned by a hexagonal lattice with a(0) = 4.0-4.6 nm and the crystatlinity becomes higher with higher Si/(Al(+Mg)) ratios of the precursors. The specific surface area (S-BET) values of the present mesoporous silicas range from 800 to 1100 m(2)/g at CTABr/precursor = 0.1 and although they are not as high as those from precursors prepared from calcining and acid-treatment of kaolinite (1420 m(2)/g), they are increased to 14001500 m2/g by increasing the ratio CTABr/precursor >= 0.2. The reason for the difference in the optimum preparation conditions between saponite and kaolinite may be attributed to the difference in the linkage of the SiO4 tetrahedra in these precursors (i.e. layered or framework structures), which result in great differences in the selective leaching rates and structures of the resulting silica-rich products. (c) 2007 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.jcis.2007.05.036

A7 メソポーラスシリカの多孔体特性に与えるカオリナイトの結晶性の影響

岡田清, 吉崎久子, 亀島欣一, 中島章

粘土科学討論会講演要旨集 ( 51 ) 44 - 45 2007年9月

B14 インドメタシン/層状複水酸化物複合体の作製とその放出挙動

亀島欣一, 小幡宏美, 中島章, 岡田清

粘土科学討論会講演要旨集 ( 51 ) 116 - 117 2007年9月

P31 アスコルビン酸ナトリウム/層状複水酸化物複合体の作製とその評価

佐々木洋和, 亀島欣一, 中島章, 岡田清

粘土科学討論会講演要旨集 ( 51 ) 208 - 209 2007年9月

Freezing of water droplets on silicon surfaces coated with various silanes

Shunsuke Suzuki, Akira Nakajima, Naoya Yoshida, Munetoshi Sakai, Ayako Hashimoto, Yoshikazu Kameshima, Kiyoshi Okada

CHEMICAL PHYSICS LETTERS 445 ( 1-3 ) 37 - 41 2007年9月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

The freezing behavior of a supercooled water droplet on a silicon surface treated with using various silanes was observed directly using a high-speed camera system. Freezing stability is best ensured by heterogeneous nucleation from a three-phase (solid-liquid-air)- contact line. Differential scanning calorimetry measurements revealed that the freezing temperature of a supercooled water droplet on a fluoro-alkylsilane monolayer was lower than that of alkylsilane. Interaction between the fluorocarbon and water molecule, in addition to structural characteristics of silanes, might play an important role in the heterogeneous nucleation of supercooled water. (C) 2007 Published by Elsevier B.V.

DOI： 10.1016/j.cplett.2007.07.066

Effect of electrification conditions on the freezing of supercooled water droplets on a hydrophobic coating

Akira Nakajima, Akihito Imase, Shunsuke Suzuki, Naoya Yoshida, Munetoshi Sakai, Ayako Hashimoto, Yoshikazu Kameshima, Hiroshi Toshiyoshi, Kiyoshi Okada

CHEMISTRY LETTERS 36 ( 8 ) 1020 - 1021 2007年8月

記述言語：英語出版者・発行元：CHEMICAL SOC JAPAN

The effects of electrification processes on ice nucleation on an octadecanethiol (ODT) coating were investigated under two different conditions. Electrification provides the driving force of the movement to the three-phase contact line. This change promotes ice nucleation on the supercooled water droplet. In contrast, electrification before cooling inhibits freezing, probably because of the limitation of orientational freedom by the interaction between the surface charge and the dipole moment of water molecules.

DOI： 10.1246/cl.2007.1020

Hydrophobicity and freezing of a water droplet on fluoroalkylsilane coatings with different roughnesses

Shunsuke Suzuki, Akira Nakajima, Naoya Yoshida, Munetoshi Sakai, Ayako Hashimoto, Yoshikazu Kameshima, Kiyoshi Okada

LANGMUIR 23 ( 17 ) 8674 - 8677 2007年8月

記述言語：英語出版者・発行元：AMER CHEMICAL SOC

Smooth (Ra approximate to 0. 1 nm) and rough (Ra approximate to 20 nm) coatings of 1H, 1H,2H,2H-perfluorodecyltrimethoxysilane (FAS17) were prepared by controlling process conditions. The water contact angles for the smooth and rough coatings were similar (107 degrees and 110 degrees, respectively), but their sliding angles differed considerably (10 degrees and 27 degrees, respectively). The surface potential on the smooth coating, assessed using Kelvin force microscopy, showed a sharp distribution, but that on the rough coating ranged widely, implying large chemical heterogeneity including residual SiOH groups. The freezing temperature of a supercooled water droplet on the rough coating was higher than that on the smooth coating.

DOI： 10.1021/la701077p

Bioactivity of CaSiO3/poly-lactic acid (PLA) composites prepared by various surface loading methods of CaSiO3 powder

Kiyoshi Okada, Fumikazu Hasegawa, Yoshikazu Kameshima, Akira Nakajima

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE 18 ( 8 ) 1605 - 1612 2007年8月

記述言語：英語出版者・発行元：SPRINGER

Mixing bioactive ceramic powders with polymers is an effective method for generating bioactivity to the polymer-matrix composites but it is necessary to incorporate up to 40 vol% of bioactive ceramic powder. However, such a high mixing ratio offsets the advantages of the flexibility and formability of polymer matrix and it would be highly advantageous to lower the mixing ratio. Since surface loading of ceramic powders in the polymer is thought to be an effective way of reducing the mixing ratio of the ceramic powder while maintaining bioactive activity, CaSiO3/poly-lactic acid (PLA) composites were prepared by three methods; (1) casting, (2) spin coating and (3) hot pressing. In methods (1) and (2), a suspension was prepared by dissolving PLA in chloroform and dispersing CaSiO3 powder in it. The suspension was cast and dried to form a film in the case of method (1) while it was spincoated on a PLA substrate in method (2). In method (3), CaSiO3 powder was surface loaded on to a PLA substrate by hot-pressing. The bioactivity of these samples was investigated in vitro using simulated body fluid (SBF). Apatite formation was not observed in the samples prepared by method (1) but some apatite formation was achieved by mixing polyethylene glycol (PEG) with the PLA, producing a porous polymer matrix. In method (2), apatite was clearly observed after soaking for 7 days. Enhanced apatite formation was observed in method (3), the thickness of the resulting apatite layers becoming about 20 mu m after soaking for 14 days. Since the amount of CaSiO3 powder used in these samples was only <= 0.4 vol%, it is concluded that this preparation method is very effective in generating bioactivity in polymer-matrix composites by loading with only very small amounts of ceramic powder.

DOI： 10.1007/s10856-007-3059-9

Photoinduced surface roughness variation in polycrystalline TiO2 thin films under different atmospheres

Naoki Arimitsu, Akira Nakajima, Ken-Ichi Katsumata, Tadashi Shiota, Toshiya Watanabe, Naoya Yoshida, Yoshikazu Karneshima, Kiyoshi Okada

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 190 ( 1 ) 53 - 57 2007年7月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE SA

For this study, we evaluated photoinduced surface roughness variation of polycrystalline anatase thin films under different atmospheres using atomic force microscopy (AFM). A TiO2 thin film with large grains was prepared using the sol-gel process and vacuum ultraviolet (VUV) irradiation before firing. Upon UV illumination, the surface image became blurred with an apparent surface roughness increase in ambient air. The appearance of this image change was delayed in dry air, and was not observed in dry nitrogen. These results imply that this photoinduced surface change is related to water adsorption from the atmosphere. (c) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jphotochem.2007.03.013

Bioactivity of CaSiO3/poly-lactic acid (PLA) composites prepared by various surface loading methods of CaSiO3 powder

Kiyoshi Okada, Fumikazu Hasegawa, Yoshikazu Kameshima, Akira Nakajima

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE 18 ( 5 ) 899 - 907 2007年5月

記述言語：英語出版者・発行元：SPRINGER

Mixing bioactive ceramic powders with polymers is an effective method for generating bioactivity to the polymer-matrix composites but it is necessary to incorporate up to 40 vol% of bioactive ceramic powder. However, such a high mixing ratio offsets the advantages of the flexibility and formability of polymer matrix and it would be highly advantageous to lower the mixing ratio. Since surface loading of ceramic powders in the polymer is thought to be an effective way of reducing the mixing ratio of the ceramic powder while maintaining bioactive activity, CaSiO3/poly-lactic acid (PLA) composites were prepared by three methods; (1) casting, (2) spin coating and (3) hot pressing. In methods (1) and (2), a suspension was prepared by dissolving PLA in chloroform and dispersing CaSiO3 powder in it. The suspension was cast and dried to form a film in the case of method (1) while it was spin-coated on a PLA substrate in method (2). In method (3), CaSiO3 powder was surface loaded on to a PLA substrate by hot pressing. The bioactivity of these samples was investigated in vitro using simulated body fluid (SBF). Apatite formation was not observed in the samples prepared by method (1) but some apatite formation was achieved by mixing polyethylene glycol (PEG) with the PLA, producing a porous polymer matrix. In method (2), apatite was clearly observed after soaking for 7 days. Enhanced apatite formation was observed in method (3), the thickness of the resulting apatite layers becoming about 20 mu m after soaking for 14 days. Since the amount of CaSiO3 powder used in these samples was only <= 0.4 vol%, it is concluded that this preparation method is very effective in generating bioactivity in polymer-matrix composites by loading with only very small amounts of ceramic powder.

DOI： 10.1007/s10856-006-0094-x

Preparation of cobalt-titanium dioxide nanocomposite films by combining inverse micelle method and plasma treatment

Naoki Arimitsu, Akira Nakajima, Yoshikazu Kameshima, Yuko Shibayama, Hisashi Ohsaki, Kiyoshi Okada

MATERIALS LETTERS 61 ( 11-12 ) 2173 - 2177 2007年5月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

We investigated the processing of a metal nanogranular thin film of Co-Ti-O system by combining a colloidal wet process (inverse micelle method) and a dry process (plasma treatment). Both TEM and EDS analyses revealed,that the film was prepared along with suppression of metal cobalt nanoparticles' oxidization. Results showed that plasma processing provides new possibilities for processing of materials that are difficult to prepare under equilibrium conditions. (c) 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.matlet.2006.08.044

Mn-Ce/ZSM5 as a new superior catalyst for NO reduction with NH3

Gabriela Carja, Yoshikazu Kameshima, Kiyoshi Okada, Changalla D. Madhusoodana

APPLIED CATALYSIS B-ENVIRONMENTAL 73 ( 1-2 ) 60 - 64 2007年4月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

Mn-Ce/ZSM-5 catalyst prepared in an aqueous phase at 423 K exhibits a broad temperature window (517-823 K) for high NO conversions (75-100%) in the process of selective catalytic reduction (SCR) by NH3 even in the presence of H2O and SO2. Both the zeolite matrix and the over-exchanged amounts of manganese and cerium contribute to obtain a complex structure that owns microporous-mesoporous characteristics and specific surface properties. (c) 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.apcatb.2006.06.003

P22.チタニア/スメクタイト複合体の細孔制御とその吸着特性(ポスターセッション,第50回粘土科学討論会発表論文抄録)

亀島欣一, 井川史彦, 中島章, 岡田清

粘土科学 46 ( 1 ) 86 - 86 2007年2月

B12.バーミキュライト/アロフェン混合系で作製した保水性材料(一般講演口頭発表,第50回粘土科学討論会発表論文抄録)

松井俊介, 磯部敏宏, 亀島欣一, 中島章, 岡田清

粘土科学 46 ( 1 ) 79 - 79 2007年2月

P21.多孔性の異なる層状複水酸化物からの層状複水酸化物/オレイン酸複合体の作製と耐酸性挙動(ポスターセッション,第50回粘土科学討論会発表論文抄録)

小幡宏美, 亀島欣一, 中島章, 岡田清

粘土科学 46 ( 1 ) 85 - 85 2007年2月

層状ナノクリスタル酸化マンガンと炭素の複合化による高機能電極材料の作製

亀島欣一

(財)村田学術振興財団年報 21 49 - 56 2007年

水と撥水性固体表面との相互作用に対する計算化学的検討

亀島欣一

中島「ナノウェッティング」プロジェクト研究概要集 31 - 40 2007年

環境に優しい層状物質：層状複水酸化物

亀島欣一

マテリアルインテグレーション 20 ( 7-8 ) 101 - 103 2007年

Preparation and Porous Properties of Mesoporous Silica from Selectively Acid-treated Saponite

Kiyoshi OKADA, Hisako YOSHIZAKI, Yoshikazu KAMESHIMA, Akira NAKAJIMA, Chengala D. MADHUSOODANA

J. Colloid Interf. Sci. 314 ( 1 ) 176 2007年

B12 バーミキュライトとアロフェンを利用した保水性材料の作製と保水性評価

松井俊介, 磯部敏宏, 亀島欣一, 中島章, 岡田清

粘土科学討論会講演要旨集 ( 50 ) 110 - 111 2006年9月

P22 チタニア/スメタタイト複合体の細孔制御とその吸着特性

亀島欣一, 井川史彦, 中島章, 岡田清

粘土科学討論会講演要旨集 ( 50 ) 188 - 189 2006年9月

P21 多孔性の異なる層状複水酸化物からの層状複水酸化物/オレイン酸複合体の作製と耐酸性挙動

小幡宏美, 亀島欣一, 中島章, 岡田清

粘土科学討論会講演要旨集 ( 50 ) 186 - 187 2006年9月

分子軌道法による水-撥水表面の相互作用の解析

亀島欣一

(財)神奈川科学技術アカデミー(KAST) 平成17年度研究概要 87-90 2006年

微粒子・粉体の表面分析

亀島欣一

日本セラミックス協会原料部会講演会講演要旨集 , , 1-8 2006年

B27. スメクタイト : 層状複水酸化物複合体のキャラクタリゼーション(第48回粘土科学討論会発表論文抄録)

亀島欣一, 新井裕之, 中島章, 岡田清

粘土科学 44 ( 2 ) 97 - 97 2004年12月

P12. モンモリロナイト-酸化チタン複合体の作製と細孔構造・光触媒活性の評価(第48回粘土科学討論会発表論文抄録)

田村佳洋, 亀島欣一, 中島章, 岡田清

粘土科学 44 ( 2 ) 99 - 99 2004年12月

P3. リン酸修飾アロフェンの重金属イオン除去特性(第48回粘土科学討論会発表論文抄録)

西牟田浩司, 亀島欣一, 中島章, 岡田清, Kenneth Mackenzie

粘土科学 44 ( 2 ) 98 - 98 2004年12月

B10. 種々の粘土鉱物の選択溶解による活性化とそれらの固体酸性(第48回粘土科学討論会発表論文抄録)

有光直樹, 亀島欣一, 中島章, 岡田清, Kenneth Mackenzie

粘土科学 44 ( 2 ) 93 - 93 2004年12月

A19 カオリンと石灰石の固相反応により調製した nCaO-Al_2Si_2O_7 の Ni イオン除去能

岡田清, Jha Vinay Kumar, 亀島欣一, 中島章

粘土科学討論会講演要旨集 ( 47 ) 68 - 69 2003年9月

メカノケミカル反応を利用した粉体合成とXPSによる表面反応の解析 (特集各産業に見る粉粒体処理技術)

岡田清, 亀島欣一, Temuujin Yoshikazu Jadambaa

化学装置 43 ( 5 ) 84 - 91 2001年5月

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