研究者詳細 - 三澤　弘明

MISC - 三澤　弘明

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Pyrene Excimer Formation in Individual Oil Droplets Dispersed in Gelatin Matrices : Space-and Time-resolved Fluorescence(共著)

Journal of Physical Chemistry 97 ( 8 ) 1701 - 1706 1993年

Electrochemistry and Fluorescence Spectroscopy on a Single, Laser-Trapped Oil Droplet in Water : Mass Transfer across Microdroplet-Water Interface(共著)

Journal of Physical Chemistry 97 ( 20 ) 5197 - 5199 1993年

LASER TWEEZERING AND ASSEMBLING OF POLYMER LATEX-PARTICLES IN SOLUTION

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

ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 203 362 - POLY 1992年4月

A SPECTROSCOPIC STUDY ON VOLUME EXPANSION PROCESSES OF PHOTORESPONSIVE ACRYLAMIDE MICROGELS

N KITAMURA, M ISHIKAWA, N TAMAI, H MISAWA, H MASUHARA

ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 203 350 - POLY 1992年4月

PHOTOPHYSICS AND PHOTOCHEMISTRY OF A LASER-MANIPULATED POLYMER MICROSPHERE

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

ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 203 599 - POLY 1992年4月

PYRENE EXCIMER FORMATION DYNAMICS IN A SINGLE MICROCAPSULE BY SPACE-RESOLVED AND TIME-RESOLVED FLUORESCENCE SPECTROSCOPY

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

JOURNAL OF PHYSICAL CHEMISTRY 96 ( 7 ) 2909 - 2914 1992年4月

記述言語：英語出版者・発行元：AMER CHEMICAL SOC

Fluorescence characteristics of a single microcapsule containing a toluene solution of pyrene were studied by three-dimensional space- and time-resolved fluorescence spectroscopy. Although pyrene excimer formation dynamics observed for the microcapsules by spatially-unresolved spectroscopy did not obey simple excimer formation kinetics (i.e., Birks kinetic model), that for a single microcapsule measured by spatially-resolved spectroscopy was shown to be described by the Birks kinetics model. The efficiency and dynamics of the excimer formation in individual capsules were different between the capsules owing to the concentration distribution of pyrene in the capsules. The importance of dynamic fluorescence spectroscopy for an individual small particle is discussed.

DOI： 10.1021/j100186a024

Web of Science

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OPTICAL TRAPPING OF A METAL-PARTICLE AND A WATER DROPLET BY A SCANNING LASER-BEAM

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

APPLIED PHYSICS LETTERS 60 ( 7 ) 807 - 809 1992年2月

記述言語：英語出版者・発行元：AMER INST PHYSICS

Laser trapping of a metal particle in water or a water droplet in liquid paraffin, which cannot be attained by irradiation of a TEM00 mode focused laser beam, was experimentally confirmed based on a scanning laser trapping technique. Although a metal particle or a water droplet experiences repulsive radiation force from a laser beam (1064 nm, focused into a approximately 1-mu-m spot), scanning of the laser beam circularly around the particle was successful to optically trap and tweezer the particle. Water and ethylene glycol droplets dispersed in liquid paraffin were also shown to be manipulated independently by scanning double laser-beam trapping.

DOI： 10.1063/1.107427

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SIMULTANEOUS MEASUREMENTS OF ABSORBENCY AND VOLUME CHANGES OF A PHOTORESPONSIVE POLYACRYLAMIDE MICROGEL IN WATER

M ISHIKAWA, H MISAWA, N KITAMURA, M IRIE, H MASUHARA

CHEMISTRY LETTERS 2,311 ( 2 ) 311 - 314 1992年2月

記述言語：英語出版者・発行元：CHEMICAL SOC JAPAN

The dynamics of photostimulated volume expansion of a polyacrylamide microgel containing triphenylmethane leucocyanide (TPMCN) in water was studied by simultaneous measurements of the time response of absorbance of triphenylmethyl cation (Abs(t)) and the radius of the gel (R(t)). The time response of the degree of ionic dissociation of TPMCN (alpha(t)) in the gel was obtained by analyzing Abs(t) and R(t) for the first time. The change in R(t) was shown to be slower than that in alpha(t).

DOI： 10.1246/cl.1992.311

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MULTIBEAM LASER MANIPULATION AND FIXATION OF MICROPARTICLES

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

APPLIED PHYSICS LETTERS 60 ( 3 ) 310 - 312 1992年1月

記述言語：英語出版者・発行元：AMER INST PHYSICS

A multibeam laser trapping-reaction system was developed to demonstrate independent manipulation of plural microparticles as well as to induce photochemical reaction in a laser-trapped particle(s). Photopolymerization of vinyl monomers dissolved in a sample solution was employed to fix polystyrene latex particles regularly aligned by laser trapping. Integrated latex structures created by the successive manipulation/polymerization procedures were also shown to be freely manipulated by laser beams.

DOI： 10.1063/1.106695

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レーザー走査マイクロマニピュレ—ション

三澤弘明, 笹木敬司

光学 21 ( 2 ) 91 - 92 1992年

レーザーマニピュレ—ション

三澤弘明

高分子 41 ( 9 ) 658 - 658 1992年

微粒子のレーザー捕捉・配列法と動的光計測

笹木敬司, 三澤弘明

光技術コンタクト 30 ( 7 ) 363 - 370 1992年

Enzyme-like Activity of Albumins on the Thermal Back Reaction of a Photochromic Spirobenzopyran(共著)

Journal of the American Chemical Society 114 ( 11 ) 4417 - 4418 1992年

3-DIMENSIONAL OPTICAL TRAPPING AND LASER ABLATION OF A SINGLE POLYMER LATEX PARTICLE IN WATER

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

JOURNAL OF APPLIED PHYSICS 70 ( 7 ) 3829 - 3836 1991年10月

記述言語：英語出版者・発行元：AMER INST PHYSICS

We developed a laser trapping-ablation system comprised of CW and pulsed Nd3+:YAG lasers as well as of an optical microscope. Three-dimensional manipulation of various kinds of particles and laser ablation of a single optically trapped, poly(methyl methacrylate) latex particle in water were demonstrated. A minute hole with its diameter of approximately sub-mu-m was fabricated on the latex particle (approximately 6-mu-m diameter). The hole size produced was much smaller than the effective diameter of the excitation laser beam, suggesting nonlinear optical (self-focusing of the laser beam) and photochemical (multiphoton absorption) mechanisms for the present laser trapping ablation. Characteristic features of the laser trapping-ablation are discussed in detail.

DOI： 10.1063/1.350344

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SPATIAL PATTERN-FORMATION, SIZE SELECTION, AND DIRECTIONAL FLOW OF POLYMER LATEX-PARTICLES BY LASER TRAPPING TECHNIQUE

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

CHEMISTRY LETTERS 3,469 ( 3 ) 469 - 472 1991年3月

記述言語：英語出版者・発行元：CHEMICAL SOC JAPAN

Polystyrene latex particles with the diameter of almost-equal-to 1-mu-m in water were laser trapped in spatial images of a laser beam. For a mixture of latex particles with different diameters, delicate tuning of the images resulted in size selection of the particles. Directional flow of the particles in water was also achieved by laser irradiation.

DOI： 10.1246/cl.1991.469

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極微変換へのアプローチ(I):微粒子のレーザーマニピュレ—ション

三澤弘明, 増原宏

レーザー研究 19 ( 5 ) 433 - 439 1991年

レーザーマニピュレ—ションによる単一微粒子の化学

三澤弘明, 増原宏

光アライアンス 2 ( 6 ) 23 - 26 1991年

Laser Manipulation and Ablation of a Single Microcapsule in Water(共著)

Journal of the American Chemical Society 113 ( 21 ) 7859 - 7863 1991年

Laser-scanning micromanipulation and spatial patterning of fine particles

Keiji Sasaki, Masanori Koshioka, Hiroaki Misawa, Noboru Kitamura, Hiroshi Masuhara

Japanese Journal of Applied Physics 30 ( 5 ) 907 - 909 1991年

記述言語：英語

Laser-scanning micromanipulation and spatial patterning of polystyrene latex or titanium dioxide particles in solution were demonstrated for the first time. A trapping laser beam was repetitionary scanned at 13-50 Hz by computer-controlled galvano mirrors to align micrometer-order particles along the pattern produced by the scanning laser beam. Characteristic features of the present technique are discussed. © 1991 The Japan Society of Applied Physics.

DOI： 10.1143/JJAP.30.L907

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LASER TRAPPING, SPECTROSCOPY, AND ABLATION OF A SINGLE LATEX PARTICLE IN WATER

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

CHEMISTRY LETTERS 8,1479 ( 8 ) 1479 - 1482 1990年8月

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