研究者詳細 - 三澤　弘明

A Biological-sensor Utilizing a Living Cell for Environment Monitoring in Micro Space (共著)

Proceedings of the International Symposium on Microsystems, Intelligent Materials and Robots 301 1995年

Laser Manipulation Technique and Its Role in Study of Micromachine (共著)

Proceedings of the International Symposium on Microsystems, Intelligent Materials and Robots 67 1995年

光の「圧力」による微粒子操作法

三澤弘明

メカライフ 44 32 - 33 1995年

微粒子の光捕捉・操作とレーザー発振

三澤弘明

應用物理 63 ( 9 ) 898 - 905 1994年9月

Laser trapping and electrochemistry of a single oil droplet in water: Electron transfer across the oil-droplet | electrode interface

Kiyoharu Nakatani, Tatsuya Uchida, Hiroaki Misawa, Noboru Kitamura, Hiroshi Masuhara

Journal of Electroanalytical Chemistry 367 ( 1-2 ) 109 - 114 1994年3月

記述言語：英語

The electrochemistry of ferrocene (FeCp) in a single micrometer-sized nitrobenzene droplet dispersed in water was studied by laser trapping and microelectrochemical techniques. Mass transfer of FeCp, ferrocenium ion, and tetra-n-butylammonium ion between the droplet and water phases accompanied by oxidation of FeCp proceeded across the droplet | water interface. The peak potential of a cyclic voltammogram of FeCp was highly dependent on the potential sweep rate. The potential shift was analyzed by thin-layer electrolysis and the results are discussed in terms of the irreversible electron transfer of FeCp across the droplet | electrode interface and in terms of mass transfer of ion species across the droplet | water interface. © 1994.

DOI： 10.1016/0022-0728(93)03036-O

Laser trapping and electrochemistry of a single oil droplet in water: Electron transfer across the oil-droplet | electrode interface

Kiyoharu Nakatani, Tatsuya Uchida, Hiroaki Misawa, Noboru Kitamura, Hiroshi Masuhara

Journal of Electroanalytical Chemistry 367 ( 1-2 ) 109 - 114 1994年3月

記述言語：英語

DOI： 10.1016/0022-0728(93)03036-O

PHOTOCHEMICAL ACROSS-A-RIDGE Z-E ISOMERIZATION OF (ETHENYL-2-D)ANTHRACENES IN THE TRIPLET-STATE

T KARATSU, H MISAWA, M NOJIRI, N NAKAHIGASHI, S WATANABE, A KITAMURA, T ARAI, H SAKURAGI, K TOKUMARU

JOURNAL OF PHYSICAL CHEMISTRY 98 ( 2 ) 508 - 512 1994年1月

記述言語：英語出版者・発行元：AMER CHEMICAL SOC

Deuterated ethenylanthracenes, 1-, 2-, and 9-(ethenyl-(Z)-2-d)anthracene, and 2-(ethenyl-(E)-2-d)anthracene ((Z)-1-, 2-, and 9-EAD, and (E)-2-EAD, respectively) undergo photochemical Z-E isomerization under thermal activation. The temperature dependence of their isomerization quantum yields and the temperature independence of lifetimes of their T-n <-- T-1 absorptions indicate that EADs isomerize adiabatically between the Z and E isomers in the lowest excited triplet state by overcoming an activation barrier (E(a) = 19-46 kJ mol(-1)) of the perpendicularly twisted geometry. The activation parameters of isomerization, Delta H double dagger (17-42 kJ mol(-1)) and Delta S double dagger (-40 to -113 J K-1 mol(-1)), decrease in the order of 2-, 1-, and 9-isomers; however, Delta G double dagger (50-54 kJ mol(-1)) is almost constant irrespective of the substitution position of the anthracene nucleus.

DOI： 10.1021/j100053a026

Absonption Microspectroscopy on Zinc Tetraphenylporphyrin in an Individual Droplet in Water (共著)

J. Phys. Chem. 98 ( 3073 ) 1994年

Absorption microspectroscopy of zinc tetraphenylporphyrin in an individual droplet in water

Seiji Funakura, Kiyoharu Nakatani, Hiroaki Misawa, Noboru Kitamura, Hiroshi Masuhara

Journal of Physical Chemistry 98 ( 12 ) 3073 - 3075 1994年

記述言語：英語

An absorption microspectroscopy system was developed for absorption measurements of a laser-manipulated individual microdroplet in water under an optical microscope. Absorption spectra of various sizes of individual tri-n-butyl phosphate (TBP) microdroplets containing zinc tetraphenylporphyrin (ZnTPP) were studied as a model. Absorbance of ZnTPP in the droplet was confirmed to increase linearly with the diameter of the droplet, showing that the Lambert-Beer law is followed for droplets with a diameter larger than 6 μm. The concentration of ZnTPP in the droplet dispersed in water is lower than that for pure TBP film by a fixed proportion, which was considered in terms of a constant water partition into TBP. © 1994 American Chemical Society.

DOI： 10.1021/j100063a003

Fluorescence Analysis of ANS Interacting with Individual Laser-Trapped Microspheres Having Different Surface Properties (共著)

Chemistry Letters ( 9 ) 1589 - 1592 1994年

OPTICAL MICROMANIPULATION OF A LASING POLYMER PARTICLE IN WATER

K SASAKI, H MISAWA, N KITAMURA, R FUJISAWA, H MASUHARA

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS 32 ( 8B ) L1144 - L1147 1993年8月

記述言語：英語出版者・発行元：JAPAN SOC APPLIED PHYSICS

Optical manipulation of a lasing microparticle in water was demonstrated. A rhodamine B-doped poly(methyl methacrylate) particle was simultaneously manipulated and pumped by 1064 nm CW and 532 nm pulsed Nd3+:YAG laser beams, respectively. Optical interactions between lasing and closely positioned nonlasing particles were studied by a multibeam laser micromanipulation technique.

DOI： 10.1143/JJAP.32.L1144

SIMULTANEOUS MANIPULATION AND LASING OF A POLYMER MICROPARTICLE USING A CW 1064 NM LASER-BEAM

H MISAWA, R FUJISAWA, K SASAKI, N KITAMURA, H MASUHARA

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS 32 ( 6A ) L788 - L790 1993年6月

記述言語：英語出版者・発行元：JAPAN J APPLIED PHYSICS

Simultaneous optical manipulation and lasing of a rhodamine 640-doped polystyrene latex particle in water was demonstrated through irradiation of a single focused 1064 nm CW Nd:YAG laser beam. Lasing of the particle resulting from two-photon absorption was confirmed from periodically spaced peaks in the emission spectrum and from nonlinear (more than quadratic) dependence of the emission intensity upon the incident laser power.

DOI： 10.1143/JJAP.32.L788

CONTROL OF A DYE FORMATION REACTION IN A SINGLE MICROMETER-SIZED OIL-DROPLET BY LASER TRAPPING AND MICROELECTROCHEMICAL METHODS

K NAKATANI, T UCHIDA, S FUNAKURA, A SEKIGUCHI, H MISAWA, N KITAMURA, H MASUHARA

CHEMISTRY LETTERS 4,717 ( 4 ) 717 - 720 1993年4月

記述言語：英語出版者・発行元：CHEMICAL SOC JAPAN

A dye formation reaction between 4-N,N-diethyl-2-methylquinonediimine and a phenol derivative at the oil-droplet/water interface was studied by a microelectrochemical method combined with laser trapping of an individual droplet in an oil-in-water emulsion system. The reaction in a single droplet with almost-equal-to 10 mum diameter was shown to be controlled by the distance between the droplet and a microelectrode.

DOI： 10.1246/cl.1993.717

POLY(N-ISOPROPYLACRYLAMIDE) MICROPARTICLE FORMATION IN WATER BY INFRARED LASER-INDUCED PHOTOTHERMAL PHASE-TRANSITION

M ISHIKAWA, H MISAWA, N KITAMURA, H MASUHARA

CHEMISTRY LETTERS 3,481 ( 3 ) 481 - 484 1993年3月

記述言語：英語出版者・発行元：CHEMICAL SOC JAPAN

Irradiation of a focused 1064 nm laser beam to an aqueous poly(N-isopropylacrylamide) solution resulted in the reversible microparticle (diameter almost-equal-to 7 mum) formation through local heating of water by the laser beam and subsequent phase transition of the polymer solution. The microparticle produced was simultaneously manipulated in three-dimensional space by the incident 1064 nm laser beam.

DOI： 10.1246/cl.1993.481

LASER MANIPULATION AND ASSEMBLING OF POLYMER LATEX-PARTICLES IN SOLUTION

H MISAWA, K SASAKI, M KOSHIOKA, N KITAMURA, H MASUHARA

MACROMOLECULES 26 ( 2 ) 282 - 286 1993年1月

記述言語：英語出版者・発行元：AMER CHEMICAL SOC

Three-dimensional laser manipulation of polymer latex particles in solution was demonstrated. Polymer latex particles with a diameter of several microns were spatially aligned in arbitrary patterns (letters and geometrical figures) by repetitively scanning a focused laser beam (1064 nm) under an optical microscope. Irradiation of nanosecond or picosecond 355-nm laser pulses on individual laser-trapped polymer particles in a sample solution containing polymerizable vinyl monomers and a photoinitiator brought about permanent fixation of the particles in three-dimensional structures. Possible roles of the laser trapping/manipulation techniques in studying the chemistry and physics of polymeric microparticles are also discussed.

DOI： 10.1021/ma00054a006