Kensaku Ito - Academia.edu (original) (raw)

Papers by Kensaku Ito

Research paper thumbnail of Dynamic character of electrically charged colloidal particles in dilute solutions

Journal of Colloid and Interface Science, 1985

Research paper thumbnail of Disappearing stacking fault in hard-sphere crystal under gravity demonstrated by Monte Carlo simulation

Research paper thumbnail of 高分子をみる 共焦点レーザースキャン顕微鏡 高分子微粒子の分散液内の分布をみる

Research paper thumbnail of Cyclodextrins Modified with Polymer Chains Which Are Responsive to External Stimuli

Macromolecules, 1995

Amino-group-containing j3-cyclodextrin (B-CD) was modified with poly(N-isopropylacrylamide) (PIPA... more Amino-group-containing j3-cyclodextrin (B-CD) was modified with poly(N-isopropylacrylamide) (PIPA, M, = 4000) chains. The inclusion of 8-anilino-1-naphthalenesulfonic acid (ANS) into the cavity of the modified cyclodextrin was largely affected by the temperature due to the coil-globule transition of PIPA chains introduced to the ,8-CD molecule. The importance of cooperative binding of ANS by the PIPA chains and the cavity of B-CD was suggested.

Research paper thumbnail of Ordered structure in dilute solutions of highly charged polymer lattices as studied by microscopy. I. Interparticle distance as a function of latex concentration

The Journal of Chemical Physics, 1983

The coexistence of ordered and disordered regions has been observed in dilute solutions of highly... more The coexistence of ordered and disordered regions has been observed in dilute solutions of highly charged monodisperse latex particles, a copolymer of styrene and styrenesulfonate, by using a metallurgical microscope. Unlike latex particles of low charge numbers, the ...

Research paper thumbnail of Cyclodextrins modified with polymer chains which are responsive to external stimuli

Macromolecules, 1995

ABSTRACT: Amino-group-containing j3-cyclodextrin (B-CD) was modified with poly (N-isopropylacryla... more ABSTRACT: Amino-group-containing j3-cyclodextrin (B-CD) was modified with poly (N-isopropylacrylamide)(PIPA, M,= 4000) chains. The inclusion of 8-anilino-1-naphthalenesulfonic acid (ANS) into the cavity of the modified cyclodextrin was largely ...

Research paper thumbnail of Particle adsorption in evaporating droplets of polymer latex dispersions on hydrophilic and hydrophobic surfaces

Colloid & Polymer Science, 1998

Stain patterns formed by drying up of droplets of polymer latex dispersion on hydrophilic and hyd... more Stain patterns formed by drying up of droplets of polymer latex dispersion on hydrophilic and hydrophobic surfaces were examined in light of the mechanism of particle adsorption in evaporating droplets. On hydrophilic surfaces, the volume of droplets decreased with time, keeping the initial outline of contact area, and circular stain patterns were formed after the dry-up of droplets. By the microscopic observation of particles in the droplets, it was found that a large portion of the particles were forced to adsorb on the outline of the contact area where a microscopic thin water layer was formed because of hydrophilicity of the surface. On hydrophobic surfaces, on the other hand, the contact area of droplets decreased as evaporation proceeded, while no particle was adsorbed on the surface at the early stages. The particles in the droplets started to aggregate when the concentration of particles reached a critical value, and the aggregates adsorbed on the surface forming tiny spots after the dry-up. Time evolutions of contact angle, contact area and volume of the droplets were analyzed in light of differences in the adsorption mechanisms between hydrophilic and hydrophobic surfaces.

Research paper thumbnail of Ordered structure in dilute solutions of highly charged polymer lattices as studied by microscopy. I. Interparticle distance as a function of latex concentration

The Journal of Chemical …, 1983

The coexistence of ordered and disordered regions has been observed in dilute solutions of highly... more The coexistence of ordered and disordered regions has been observed in dilute solutions of highly charged monodisperse latex particles, a copolymer of styrene and styrenesulfonate, by using a metallurgical microscope. Unlike latex particles of low charge numbers, the ...

Research paper thumbnail of Visible evidence for interparticle attraction in polymer latex dispersions

Research paper thumbnail of Colloidal Crystal Gel, Its Production Process, and Optical Devices Using the Same

Research paper thumbnail of Microscopic observation and quasielastic light-scattering measurements of colloid crystals. Determination of the radial distribution function and structure factor for the two-state structure

J Am Chem Soc, 1990

of our department for their kind help rendered during the Karl-Fischer analysis. Special thanks a... more of our department for their kind help rendered during the Karl-Fischer analysis. Special thanks are due to Dr. Takashi Yamamoto, Tosoh Company Ltd., for his IR, 'H NMR, and ion chromatography analyses of the samples. The generous financial support by the Ministry of Education, Science and Culture is highly appreciated (Grantsin-aid for the Specially Promoted Research, 59065004 and 63060003).

Research paper thumbnail of Life span of a local structure in colloidal suspensions

Research paper thumbnail of Gelated colloid crystal precursor and gelated colloid crystal, and method and apparatus for preparing gelated colloid crystal

Research paper thumbnail of Raman spectroscopic study of hydrogen bonding of N-alkyl-2-pyrrolidinones in heavy water

Spectrochimica Acta Part A: Molecular Spectroscopy, 1992

Research paper thumbnail of イオン性高分子溶液における構造形成

Nihon Kessho Gakkaishi, 1988

Research paper thumbnail of Colloidal crystal growth

Journal of the Chemical Society, Faraday Transactions, 1991

ABSTRACT

Research paper thumbnail of コロイド結晶ゲル、その製造方法、および、それを用いた光学素子

Research paper thumbnail of Inhomogeneity of solute distribution in ionic systems

Faraday Discussions of the Chemical Society, 1990

ABSTRACT

Research paper thumbnail of Space Experiment on 3-Dimensioal Photonic Crystal Growth and Its Apparatus

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN, 2009

An experimental apparatus for growing colloidal crystal under microgravity conditions in the Inte... more An experimental apparatus for growing colloidal crystal under microgravity conditions in the International Space Station (ISS) was developed. The apparatus was designed so that all experimental steps proceeded automatically with the use of a sequential controller unit. The crystal growth cell (CGC) in which the ionic condition of colloidal dispersion medium was gradually changed with time by diffusing ions through

Research paper thumbnail of Growth of local structure in colloidal suspensions

Physical review. B, Condensed matter, Jan 15, 1990

ABSTRACT

Research paper thumbnail of Dynamic character of electrically charged colloidal particles in dilute solutions

Journal of Colloid and Interface Science, 1985

Research paper thumbnail of Disappearing stacking fault in hard-sphere crystal under gravity demonstrated by Monte Carlo simulation

Research paper thumbnail of 高分子をみる 共焦点レーザースキャン顕微鏡 高分子微粒子の分散液内の分布をみる

Research paper thumbnail of Cyclodextrins Modified with Polymer Chains Which Are Responsive to External Stimuli

Macromolecules, 1995

Amino-group-containing j3-cyclodextrin (B-CD) was modified with poly(N-isopropylacrylamide) (PIPA... more Amino-group-containing j3-cyclodextrin (B-CD) was modified with poly(N-isopropylacrylamide) (PIPA, M, = 4000) chains. The inclusion of 8-anilino-1-naphthalenesulfonic acid (ANS) into the cavity of the modified cyclodextrin was largely affected by the temperature due to the coil-globule transition of PIPA chains introduced to the ,8-CD molecule. The importance of cooperative binding of ANS by the PIPA chains and the cavity of B-CD was suggested.

Research paper thumbnail of Ordered structure in dilute solutions of highly charged polymer lattices as studied by microscopy. I. Interparticle distance as a function of latex concentration

The Journal of Chemical Physics, 1983

The coexistence of ordered and disordered regions has been observed in dilute solutions of highly... more The coexistence of ordered and disordered regions has been observed in dilute solutions of highly charged monodisperse latex particles, a copolymer of styrene and styrenesulfonate, by using a metallurgical microscope. Unlike latex particles of low charge numbers, the ...

Research paper thumbnail of Cyclodextrins modified with polymer chains which are responsive to external stimuli

Macromolecules, 1995

ABSTRACT: Amino-group-containing j3-cyclodextrin (B-CD) was modified with poly (N-isopropylacryla... more ABSTRACT: Amino-group-containing j3-cyclodextrin (B-CD) was modified with poly (N-isopropylacrylamide)(PIPA, M,= 4000) chains. The inclusion of 8-anilino-1-naphthalenesulfonic acid (ANS) into the cavity of the modified cyclodextrin was largely ...

Research paper thumbnail of Particle adsorption in evaporating droplets of polymer latex dispersions on hydrophilic and hydrophobic surfaces

Colloid & Polymer Science, 1998

Stain patterns formed by drying up of droplets of polymer latex dispersion on hydrophilic and hyd... more Stain patterns formed by drying up of droplets of polymer latex dispersion on hydrophilic and hydrophobic surfaces were examined in light of the mechanism of particle adsorption in evaporating droplets. On hydrophilic surfaces, the volume of droplets decreased with time, keeping the initial outline of contact area, and circular stain patterns were formed after the dry-up of droplets. By the microscopic observation of particles in the droplets, it was found that a large portion of the particles were forced to adsorb on the outline of the contact area where a microscopic thin water layer was formed because of hydrophilicity of the surface. On hydrophobic surfaces, on the other hand, the contact area of droplets decreased as evaporation proceeded, while no particle was adsorbed on the surface at the early stages. The particles in the droplets started to aggregate when the concentration of particles reached a critical value, and the aggregates adsorbed on the surface forming tiny spots after the dry-up. Time evolutions of contact angle, contact area and volume of the droplets were analyzed in light of differences in the adsorption mechanisms between hydrophilic and hydrophobic surfaces.

Research paper thumbnail of Ordered structure in dilute solutions of highly charged polymer lattices as studied by microscopy. I. Interparticle distance as a function of latex concentration

The Journal of Chemical …, 1983

The coexistence of ordered and disordered regions has been observed in dilute solutions of highly... more The coexistence of ordered and disordered regions has been observed in dilute solutions of highly charged monodisperse latex particles, a copolymer of styrene and styrenesulfonate, by using a metallurgical microscope. Unlike latex particles of low charge numbers, the ...

Research paper thumbnail of Visible evidence for interparticle attraction in polymer latex dispersions

Research paper thumbnail of Colloidal Crystal Gel, Its Production Process, and Optical Devices Using the Same

Research paper thumbnail of Microscopic observation and quasielastic light-scattering measurements of colloid crystals. Determination of the radial distribution function and structure factor for the two-state structure

J Am Chem Soc, 1990

of our department for their kind help rendered during the Karl-Fischer analysis. Special thanks a... more of our department for their kind help rendered during the Karl-Fischer analysis. Special thanks are due to Dr. Takashi Yamamoto, Tosoh Company Ltd., for his IR, 'H NMR, and ion chromatography analyses of the samples. The generous financial support by the Ministry of Education, Science and Culture is highly appreciated (Grantsin-aid for the Specially Promoted Research, 59065004 and 63060003).

Research paper thumbnail of Life span of a local structure in colloidal suspensions

Research paper thumbnail of Gelated colloid crystal precursor and gelated colloid crystal, and method and apparatus for preparing gelated colloid crystal

Research paper thumbnail of Raman spectroscopic study of hydrogen bonding of N-alkyl-2-pyrrolidinones in heavy water

Spectrochimica Acta Part A: Molecular Spectroscopy, 1992

Research paper thumbnail of イオン性高分子溶液における構造形成

Nihon Kessho Gakkaishi, 1988

Research paper thumbnail of Colloidal crystal growth

Journal of the Chemical Society, Faraday Transactions, 1991

ABSTRACT

Research paper thumbnail of コロイド結晶ゲル、その製造方法、および、それを用いた光学素子

Research paper thumbnail of Inhomogeneity of solute distribution in ionic systems

Faraday Discussions of the Chemical Society, 1990

ABSTRACT

Research paper thumbnail of Space Experiment on 3-Dimensioal Photonic Crystal Growth and Its Apparatus

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN, 2009

An experimental apparatus for growing colloidal crystal under microgravity conditions in the Inte... more An experimental apparatus for growing colloidal crystal under microgravity conditions in the International Space Station (ISS) was developed. The apparatus was designed so that all experimental steps proceeded automatically with the use of a sequential controller unit. The crystal growth cell (CGC) in which the ionic condition of colloidal dispersion medium was gradually changed with time by diffusing ions through

Research paper thumbnail of Growth of local structure in colloidal suspensions

Physical review. B, Condensed matter, Jan 15, 1990

ABSTRACT