研究者詳細 - 竹岡　敬和

論文 - 竹岡　敬和

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高分子科学最近の進歩構造色ゲル

竹岡敬和

高分子 54 巻 ( 4 ) 頁： 258-263 - 263 2005年

Surface activity and redox behavior of a non-ionic surfactant containing a phenothiazine group 査読有り

MABH Susan, A Ishibashi, Y Takeoka, M Watanabe

COLLOIDS AND SURFACES B-BIOINTERFACES 38 巻 ( 3-4 ) 頁： 167 - 173 2004年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

A novel non-ionic surfactant, alpha-(phenothiazinylhexyl)-omega-hydroxy-oligo(ethylene oxide) (PCPEG) containing phenothiazine as an electroactive group has been synthesized. Fundamental interfacial behavior of the surfactant at the air/water interface has been investigated by means of surface tensiometry to provide an insight into the relationship between the structure of the hydrophobic moiety and the surfactant properties. A comparison of diffusivity of PCPEG in the aqueous phase with that in the acetonitrile solution at high PCPEG concentrations shows that micellization has a pronounced effect on the redox behavior of PCPEG. The electrochemical responses for PCPEG aqueous solutions at the interface of a glassy carbon electrode are fairly dependent on the concentration of PCPEG. Above CMC, PCPEG molecules self-associate to form micellar aggregates and the formation and disruption of micelles can be reversibly controlled by change in the redox state of the phenothiazine group. The cyclic voltammetric responses for PCPEG aqueous solutions have been correlated with the dissolved states to explain the distinctive feature of the surfactant. (C) 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.colsurfb.2004.01.016

Web of Science

PubMed

構造色ゲル

竹岡敬和, 渡邉正義

日本ゴム協會誌 77 巻 ( 5 ) 頁： 155-158 - 158 2004年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

A periodically ordered interconnecting porous structure could be imprinted in hydrogels by using closest packing silica colloidal crystals as mesoscopically sized templates. The interconnecting porous structure provides fast response to an infinitesimal change of environment for reversible swelling and shrinking of the hydrogels, while the periodically ordered mesoscopical structure endows a structural color in the gel. The structural color with different optical behaviors can be tuned by simply changing the amount of the cross-linker in the pre-gel solutions. The structural color imprinted in the gel is quickly synchronized with the change in the volume of the gels. The newly invented porous hydrogels possess optical properties as environmentally sensitive smart gels.

DOI： 10.2324/gomu.77.155

CiNii Books

CiNii Research

Surface activity and redox behavior of a non-ionic surfactant containing a phenothiazine group 査読有り

Susan, M.A.B.H., Ishibashi, A., Takeoka, Y. and Watanabe, M.

Colloids and Surfaces B-Biointerfaces 38 巻頁： 167-173 2004年

Controlled multistructural color of a gel membrane 査読有り

Y Takeoka, M Watanabe

LANGMUIR 19 巻 ( 23 ) 頁： 9554 - 9557 2003年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC

A "smart" soft membrane exhibiting controlled multistructural color has been synthesized by the mechanical immobilization of a single side of a polymerized nonclosest packing colloidal crystal. A tapered gel with one fixed surface on a gel-bond film reveals monostructural color. After a partial hydrolysis of the gel to change its volume from the original size, the structural color varies depending on the thickness of the membrane. The tone can be tuned by simply changing the composition of the mixed solvent.

DOI： 10.1021/la0344175

Web of Science

Self-sustaining peristaltic motion on the surface of a porous gel 査読有り

Y Takeoka, M Watanabe, R Yoshida

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 125 巻 ( 44 ) 頁： 13320 - 13321 2003年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC

Many materials in living organisms exhibit self-sustaining 
oscillations of chemical and/or physical organization, 
for example,the peristaltic motion of the intestinal tract. 
Some artificial materials have similar properties and thus the 
potential for mimicking biological functions.Now researchers in 
Japan have developed a polymer-gel system that undergoes 
colour changes such that the oscillations can be observed on the 
surface of the gel for the first time (Takeoka,Y.,Watanabe,M.& 
Yoshida,R.Journal of the American Chemical Society 125, 
13320.V13321; 2003).The gel consists of two monomers, 
N-isopopylacrylamide,which controls the swelling and collapse 
of the gel in response to temperature,and a Ru-complex. 
Under certain chemical conditions,the Ru-complex ion 
catalyses a specific reaction (BZ) in which the ion is alternately 
oxidized and reduced as the reaction propagates,resulting in 
colour changes.When the gel is simultaneously subjected to 
changes in temperature,the swelling response of the gel 
occurs in parallel with the BZ reaction,resulting in waves of colour 
changes concomitant with the peristaltic motion.The colour 
tunability of these gels have the potential for use in devices

DOI： 10.1021/ja036904c

Web of Science

PubMed

Tuning structural color changes of porous thermosensitive gels through quantitative adjustment of the cross-linker in pre-gel solutions 査読有り

Y Takeoka, M Watanabe

LANGMUIR 19 巻 ( 22 ) 頁： 9104 - 9106 2003年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC

"Smart" porous gels with different optical behaviors were synthesized by quantitative adjustment of the cross-linker in pre-gel solutions. A periodically ordered interconnecting porous structure could be created in the gels by using a closest-packing silica colloidal crystal as a template. The interconnecting porosity provides fast response to changes in temperature through the reversible swelling and shrinking of the gels, while the periodically ordered mesoscopic structure endows the porous gels with structural color, which can be tuned by simply changing the amount of the cross-linker in the pre-gel solutions.

DOI： 10.1021/la035142w

Web of Science

Template synthesis and optical properties of chameleonic poly(N-isopropylacrylamide) gels using closest-packed self-assembled colloidal silica crystals 査読有り

Y Takeoka, M Watanabe

ADVANCED MATERIALS 15 巻 ( 3 ) 頁： 199 - + 2003年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY-V C H VERLAG GMBH

Smart macroporous hydrogels with a range of optical behavior have been prepared using colloidal crystals as templates. The structural color imprinted in the gel (see Figure and cover) varies with a change in the volume of the gel. It is now possible to build a soft material that displays the various structural colors available to living things.

Web of Science

Template synthesis of poly(N-isopropylacrylamide) minigels using interconnecting macroporous polystyrene 査読有り

M Kumoda, Y Takeoka, M Watanabe

LANGMUIR 19 巻 ( 3 ) 頁： 525 - 528 2003年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC

Thermosensitive uniform-sized poly(N-isopropylacrylamide) minigels with diameters of several micrometers were synthesized by a double template method using silica particles as original molds. The first template composed of the silica particles produced a macroporous polystyrene as the second template to decide the shape and the size of the minigels. The resultant minigels in the second template covalently interconnect with each other. After the minigels were collapsed in each compartment of the macroporous polystyrene, the separated minigel particles were obtained.

DOI： 10.1021/la020758r

Web of Science

Polymer Gels that Memorize Structures of Mesoscopically Sized Templates 査読有り

Takeoka, Y, Watanabe, M

Langmuir 18 巻頁： 5977-5980 2003年

Simple and precision design of porous gel as a visible indicator for ionic species and concentration 査読有り

H Saito, Y Takeoka, M Watanabe

CHEMICAL COMMUNICATIONS ( 17 ) 頁： 2126 - 2127 2003年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY

Here we report the design and synthesis of a novel porous gel for an ionic visible indicator. The rapid-responsive porous gel which reveals color changes depending on a potassium ion concentration was prepared using a templating technique.

DOI： 10.1039/b304306a

Web of Science

Self-Sustaining Peristaltic Motion on the Surface of a Porous Gel 査読有り

Takeoka, Y., Watanabe, M., and Yoshida, R.

J. Am. Chem. Soc 125 巻頁： 13320 2003年

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Many materials in living organisms exhibit self-sustaining
oscillations of chemical and/or physical organization,
for example,the peristaltic motion of the intestinal tract.
Some artificial materials have similar properties and thus the
potential for mimicking biological functions.Now researchers in
Japan have developed a polymer-gel system that undergoes
colour changes such that the oscillations can be observed on the
surface of the gel for the first time (Takeoka,Y.,Watanabe,M.&
Yoshida,R.Journal of the American Chemical Society 125,
13320.V13321; 2003).The gel consists of two monomers,
N-isopopylacrylamide,which controls the swelling and collapse
of the gel in response to temperature,and a Ru-complex.
Under certain chemical conditions,the Ru-complex ion
catalyses a specific reaction (BZ) in which the ion is alternately
oxidized and reduced as the reaction propagates,resulting in
colour changes.When the gel is simultaneously subjected to
changes in temperature,the swelling response of the gel
occurs in parallel with the BZ reaction,resulting in waves of colour
changes concomitant with the peristaltic motion.The colour
tunability of these gels have the potential for use in devices used
for determining oscillations in nonlinear chemical reactions.

Polymer Gels that Memorize Structures of Mesoscopically Sized Templates 査読有り

Takeoka, Y. and Watanabe, M.

Langmuir 18 巻頁： 5977-5980 2003年

Template synthesis of poly(N-isopropylacrylamide) minigels using interconnecting macroporous polystyrene 査読有り

Kumoda, M., Takeoka, Y. and Watanabe, M.

Langmuir 19 巻頁： 525-528 2003年

Template synthesis and optical properties of chameleonic poly(N-isopropylacrylamide)gels using closest-packed self-assembled colloidal silica crystals 査読有り

Takeoka, Y. and Watanabe, M.

Adv. Mater, 15 巻頁： 199-201 2003年

Simple and Precision Preparation of Porous Gel for Colorimetric Chemical Sensor by Templating Technique 査読有り

Nakayama, D., Takeoka, Y., Watanabe, M., Kataoka, K.

Angew. Chem. Int. Ed. 42 巻頁： 4197-4200 2003年

Tuning Structural Color Changes of Porous Thermo-sensitive Gels Through Quantitative Adjustment of The Cross-linker in Pre-gel Solutions 査読有り

Takeoka, Y. and Watanabe, M.

Langmuir 19 巻頁： 9104-9106 2003年

Simple and precision design of porous gel as a visible indicator for ionic species and concentration 査読有り

Saito, H., Takeoka, Y. and Watanabe, M.

Chem. Commun. 頁： 2126-2127 2003年

Controlled Multi-Structural-Color of a Gel Membrane 査読有り

Takeoka, Y. and Watanabe, M.

Langmuir 19 巻頁： 9554-9557 2003年

Simple and precise preparation of a porous gel for a colorimetric glucose sensor by a templating technique 査読有り

D Nakayama, Y Takeoka, M Watanabe, K Kataoka

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 42 巻 ( 35 ) 頁： 4197 - 4200 2003年

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