研究者詳細 - 竹岡　敬和

論文 - 竹岡　敬和

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Structural Colored Gel

Takeoka Yukikazu

JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY 22 巻 ( 2 ) 頁： 123-132 2009年

Structural colored gel 査読有り

Takeoka Y.

Journal of Photopolymer Science and Technology 22 巻 ( 2 ) 頁： 123 - 132 2009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：Journal of Photopolymer Science and Technology

A periodically ordered interconnecting porous structure can be embodied in a chemical gel by using a closest-packed colloidal crystal as a template. The interconnecting porosity not only provides a quick response but also endows the porous gel with structural color arising from coherent Bragg optical diffraction. The structural color revealed by porous gels can be regulated by several techniques, and thus it is feasible to obtain desirable, smart, soft materials. The swelling parameter of the polymer chains in the polymer network in response to the environment may be recognized through the variation in the color of the structural colored gel by using the fine colloidal crystal. The role of the volume interactions between the polymer chains in the gel can be estimated by simply measuring the length of the gel, based on the assumption that the subchains in the polymer network under the preparation conditions behave as unperturbed Gaussian coils. This means that it is possible to determine the change at the molecular level in the gel such as the swelling parameter of the polymer chains in the polymer network in response to the environment with the naked eye only when the gel is fabricated from specific a pre-gel solution and a colloidal crystal. The linear expansion factor of the subchains was assessed by comparing the positions of the diffraction peak (λmax) in a given situation and the Gaussian state at temperatures lower than the LCST of the porous gel. The periodically ordered structure with a size corresponding to the wavelength of optical light allows us to detect the behavior of polymer chains through the structural color. This review focuses on the synthesis of the structural colored porous gel and on the visualizing conformations of subchains by creating optical wavelength-sized periodically ordered structure in hydrogel. The main portion of this article was previously published in Langmuir.19 ©2OO9CPST.

DOI： 10.2494/photopolymer.22.123

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Scopus

CiNii Research

Structural Colored Gels for Tunable Soft Photonic Crystals 査読有り

Harun-Ur-Rashid, M; Seki, T; Takeoka, Y

CHEMICAL RECORD 9 巻 ( 2 ) 頁： 87 - 105 2009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：Chemical Record

A periodically ordered interconnecting porous structure can be embodied in chemical gels by using closest-packed colloidal crystals as templates. The interconnecting porosity not only provides a quick response but also endows the porous gels with structural color arising from coherent Bragg optical diffraction. The structural colors revealed by porous gels can be regulated by several techniques, and thus, it is feasible to obtain desirable, smart, soft materials. A well-known thermosensitive monomer, N-isopropylacrylamide (NIPA), and other minor monomers were used to fabricate various structural colored gels. The selection of minor monomers depended on the targeted properties. This review focuses on the synthesis of templates, structural colored porous gels, and the applications of structural colored gel as smart soft materials for tunable photonic crystals. © 2009 The Japan Chemical Journal Forum and Wiley Periodicals, Inc.

DOI： 10.1002/tcr.20169

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PubMed

Template Synthesis for Stimuli-Responsive Angle Independent Structural Colored Smart Materials

Harun-Ur-Rashid Mohammad, Imran Abu Bin, Seki Takahiro, Takeoka Yukikazu, Ishii Masahiko, Nakamura Hiroshi

Transactions of the Materials Research Society of Japan 34 巻 ( 2 ) 頁： 333-337 - 337 2009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：The Materials Research Society of Japan

Like other conventional smart materials, structural color showing smart materials inherit physical and chemical characteristics imposed by the templates. Smart Material such as structural colored gel made of photonic crystal (PC) as template, exhibits angle dependent structural color because the color arises from the Bragg optical diffraction of light from crystal planes. But angle independent or low angle dependent structural color is required for devising of display with a wide viewing angle. To meet this purpose we prepared photonic glass (PG) from silica colloidal spheres. This PG is able to exhibit structural color, which is stable against the change of the angle of view and the angle of illumination. The transmittance spectrum evidences the angle independence of the structural color of PG. The Fast Fourier Transformation and the autocorrelation function prove that we prepared an amorphous material. The existence of short range order helps PG to exhibit angle independent structural color.

DOI： 10.14723/tmrsj.34.333

CiNii Research

Template Synthesis for Stimuli-Responsive Angle Independent Structural ColoredSmart Materials 査読有り

Harun-Ur-Rashid, M, Imran, A. B, Seki, T, Ishii, M, Nakamura, H, Takeoka, Y

Transactions of the Materials Research Society Japan in press 巻 2009年

Chromic slide-ring gel based on reflection from photonic bandgap 査読有り

Murayama, H; Bin Imran, A; Nagano, S; Seki, T; Kidowaki, M; Ito, K; Takeoka, Y

MACROMOLECULES 41 巻 ( 5 ) 頁： 1808 - 1814 2008年3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：Macromolecules

Here we report on a chromic slide-ring gel consisting of polyrotaxane by using a close-packed colloidal crystal as a template. In the slide-ring gel, the polymer chains with bulky end groups are not covalently cross-linked like chemical gels nor do they interact attractively like physical gels, but are topologically interlocked by figure-of-eight cross-links. The slide-ring gel has freely movable cross-links, which have a pulley effect on tensile deformation. This effect improves the mechanical properties of polymer gels. In this work, this physically and mechanically optimized polymer gel was used to make stimuli-responsive photonic band gap materials. Our gel exhibits solvatochromic behavior based on the change in structural color. © 2008 American Chemical Society.

DOI： 10.1021/ma0715627

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Chromic Slide-Ring Gel based on Reflection from Photonic Bandgap 査読有り

Murayama, H., Imran, A. B., Nagano, S., Seki, T., Kidowaki, M., Ito, K., Takeoka, Y.

Macromolecules 41 巻頁： 1808-1814 2008年

Chemical and Optical Control of Peristaltic Actuator Based on Self-Oscillating Porous Gel 査読有り

Shinohara, S., Seki, T., Sakai, T., R. Yoshida, Takeoka, Y.

Chemical Communications 4735-4737 巻 2008年

*Photoregulated Worm-like Motion of Gel 査読有り

Shinohara, S., Seki, T., Sakai, T., R. Yoshida, Takeoka, Y.

Angew. Chem. Int. Ed. 97 巻頁： 9039-9043 2008年

*Fabrication of Mechanically Improved Hydrogels Using Movable Cross-linker Based on Vinyl Modified Polyrotaxane 査読有り

Imran, A. B., Seki, T., Kataoka, T., Kidowaki, M., Ito, K., Takeoka, Y.

Chemical Communications 頁： 5227-5229 2008年

Chemical and optical control of peristaltic actuator based on self-oscillating porous gel 査読有り

Shinohara, S; Seki, T; Sakai, T; Yoshida, R; Takeoka, Y

CHEMICAL COMMUNICATIONS 4735-4737 巻 ( 39 ) 頁： 4735 - 4737 2008年

Photoregulated Wormlike Motion of a Gel 査読有り国際誌

Shinohara, S; Seki, T; Sakai, T; Yoshida, R; Takeoka, Y

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 47 巻 ( 47 ) 頁： 9039 - 9043 2008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：Angewandte Chemie - International Edition

(Figure Presented) Global worming: A periodically ordered mesoporous gel demonstrates photoregulated peristaltic motion induced by a nonlinear oscillating Belousov-Zhabotinsky reaction. The amplitude and period of the motion can be controlled by adjusting the intensity of visible light irradiation (see picture). Peristaltic motion of the gel surface can be observed by the change in structural color based on the reflection from the photonic band gap of the gel. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA.

DOI： 10.1002/anie.200803046

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PubMed

Fabrication of mechanically improved hydrogels using a movable cross-linker based on vinyl modified polyrotaxane 査読有り国際誌

Bin Imran, A; Seki, T; Kataoka, T; Kidowaki, M; Ito, K; Takeoka, Y

CHEMICAL COMMUNICATIONS ( 41 ) 頁： 5227 - 5229 2008年

Photoregulated wormlike motion of a gel 査読有り

Shinohara Shu-ichi, Seki Takahiro, Sakai Takamasa, Yoshida Ryo, Takeoka Yukikazu

Angewandte Chemie 120 巻 ( 47 ) 頁： 9179 2008年

An electro- and thermochromic hydrogel as a full-color indicator 査読有り国際誌

Ueno, K; Matsubara, K; Watanabe, M; Takeoka, Y

ADVANCED MATERIALS 19 巻 ( 19 ) 頁： 2807 - + 2007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：Advanced Materials

A periodically porous gel that exhibits various, switchable colors over the visible region initiated by both electrochemical reaction and temperature change has been presented. This gel displays every color in the visible region, depending on temperature, and also reveals an electrochemically triggered rapid two-state switching between two arbitrary structural colors at constant temperature. A material that exhibits a change of up to a factor of two in the linear swelling degree was required to develop stimuli-responsive and full-color chromic materials. Producing periodic porosity into this hydrogel using the CCC as a template provides with an effective approach for creating a gel that exhibits various switchable colors over the visible region by external stimuli. The developed stimuli-responsive chromic hydrogel exhibits an electric-field-triggered 'two-state switching' between two arbitrary structural colors in the entire visible region at certain temperatures.

DOI： 10.1002/adma.200700159

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フォトクロミックゲル

竹岡敬和

光化学 = Photochemistry 38 巻 ( 2 ) 頁： 126-129 - 129 2007年9月

Organized monolayer of thermosensitive microgel beads prepared by double-template polymerization 査読有り

Sakai, T; Takeoka, Y; Seki, T; Yoshida, R

LANGMUIR 23 巻 ( 17 ) 頁： 8651 - 8654 2007年8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：Langmuir

A 2D close-packed array of thermosensitive microgel beads was prepared by the double-template polymerization method. First, a 2D colloidal crystal of silica beads with 10 μm diameter was obtained by the solvent evaporation method. This monolayer of colloidal crystals can serve as the first template for the preparation of macroporous polystyrene. The macroporous polystyrene trapping the crystalline order can be used as a negative template for fabricating gel beads arrays. A functional surface using thermosensitive poly(N-isopropylacrylamide) gel beads array was fabricated by the double-template polymerization method. © 2007 American Chemical Society.

DOI： 10.1021/la700448t

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PubMed

Photoresponsive slide-ring gel 査読有り

Sakai, T; Murayama, H; Nagano, S; Takeoka, Y; Kidowaki, M; Ito, K; Seki, T

ADVANCED MATERIALS 19 巻 ( 15 ) 頁： 2023 - + 2007年8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：Advanced Materials

Photoresponsive ring-slide polymer gels showing unique behavior derived from the dynamic supramolecular framework have been prepared successfully. The characteristic ability of these gels to deform easily leads to stimuli-sensitive properties, while numerous types of gels have been developed for a variety of applications such as actuators, optically tunable lenses, and self-oscillating devices. Light is of particular use for controlling materials because of its spatial accuracy and time resolution in the irradiation process. The overshoot swelling behavior at the transient stage is a characteristic feature of slide-ring gels. The unusually large photo induced deformation for azobenzene-containing gel and the appearance of transient overshooting behavior in the swelling process are due to the pulley effect of the mobile cross-linkers. However, new behaviors found in the light-responsive slide-ring gels are expected to lead to more applications in polymer-gel science and technology.

DOI： 10.1002/adma.200700457

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Biform structural colored hydrogel for observation of subchain conformations 査読有り

Takeoka, Y; Seki, T

MACROMOLECULES 40 巻 ( 15 ) 頁： 5513 - 5518 2007年7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：Macromolecules

We prepared a biform structural colored thermosensitive gel using both a close-packed colloidal crystal and a wing of a morpho butterfly. The porous portion of the gel obtained by the close-packed colloidal crystal as a template exhibits a change in "structural color" according to the volume when the water temperature is altered. Meanwhile, the portion where tiny scales of the wing are strewn on the surface of the gel (a morpho gel) also reveals "structural color", but irrespective of the volume change. The reflection spectrum from "the morpho gel" portion provides the standard value of the peak position, λmax,0, indicating that the subchains in the gel are Gaussian chains. Consequently, we can estimate the linear expansion factor a of the subchains by comparing the peak positions of the reflection spectra from the porous gel, λmax, and from the morpho gel, λmax: λmax/λ max,0 ∼ α. We can detect the change in the conformation of subchains in the gel in response to the external perturbations surrounding the gel with the naked eye and/or spectroscopic methods through the comparison of the both structural colors. © 2007 American Chemical Society.

DOI： 10.1021/ma0701078

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二段階鋳型重合法を用いた温度応答型ゲル微粒子単層組織化膜の作製

酒井崇匡, 竹岡敬和, 関隆広, 吉田亮

高分子論文集 64 巻 ( 1 ) 頁： 45-49 2007年1月

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