Faculty Profiles - TAKEOKA, Yukikazu

Papers - TAKEOKA, Yukikazu

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Angle-independent colored materials based on the Christiansen effect using phase-separated polymer membranes

Takeoka Yukikazu

POLYMER JOURNAL Vol. 49 ( 3 ) page： 301-308 2017.3

Highly Responsive Hydrogel out of Poly(N-isopropyl acryalamide) Grafted Polyrotaxane as Building Block Designed by Living Radical polymerization and Click Chemistry Reviewed

Yasumoto, A., Gotoh, H., Gotoh, Y., Imran, A. B., Seki, T., Sakai, Y., Ito, K., Takeoka, Y.

Macromolecules Vol. 50 page： 364-374 2017

Structural color coating films composed of an amorphous array of colloidal particles via electrophoretic deposition Reviewed

Katagiri, K.,* Tanaka, Y., Uemura K., Inumaru, K., Seki, T., Takeoka, Y.

NPG Asia Materials Vol. 9 page： e355 2017

Bio-inspired Bright Structurally Coloured Colored Colloidal Amorphous Array Enhanced by Controlling Thickness and Black Background Reviewed

Ogawa, K., Hara, M., Nagano, S., Seki, T., Takeoka, Y.

Advanced Materials Vol. 29 page： 1605050(1-8) 2017

Photo-tunable Christiansen Colour Filter Using Photoisomerization of Stilbene Reviewed

Ogawa, K., Hara, M., Nagano, S., Seki, T., Takeoka, Y.

Chem. Lett. Vol. 46 page： 1386-1389 2017

白と黒の材料から作られるカラフルな色材:—鮮やかな構造色の発現には，微細構造と黒色物質の存在が重要—

竹岡敬和

化学と教育 Vol. 65 ( 12 ) page： 640-643 - 643 2017

Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人日本化学会

自然界には，大きく分けて二種類の発色方法がある。染料や顔料を用いた発色と，光の波長サイズの微細構造を利用した発色である。人類は，多くの染料や顔料を自然界から集め，それを人工的に作る方法を身につけてきた。そのおかげで，現在の我々の生活は様々な色にあふれた豊かな環境にある。しかし，21世紀になってからは，人間や環境に対して，より負荷の低い安全な素材を用いた，高耐久性，高機能性を有する色材が求められるようになり，微細構造を利用した発色材料，つまり，構造発色性材料が注目されている。本稿では，自然にある構造発色性材料を取り上げ，これまでにあまり理解されていなかった構造発色性について説明する。

DOI： 10.20665/kakyoshi.65.12_640

CiNii Research

Various Structural Colored Pigments Prepared by White and Black Fine Particles

TAKEOKA Yukikazu

Journal of the Japan Society of Colour Material Vol. 90 ( 11 ) page： 393-397 - 397 2017

Language：English Publishing type：Research paper (scientific journal) Publisher：Japan Society of Colour Material

Because safety to the environment and people is respected, safe and inexpensive non-fading colored materials are required. In this review, I will explain how to prepare a material displaying a vivid structural color by using a fine structure that is a comparable to the wavelength size of visible light and a black substance.

DOI： 10.4011/shikizai.90.393

CiNii Books

CiNii Research

Molecular Weight Dependency of Polyrotaxane-cross-linked Polymer Gel Extensibility Reviewed

Ohmori, K., Imran, A. B., Seki, T., Liu, C., Mayumi, K., Ito, K., Takeoka, Y.

Chemical Communications Vol. 52 page： 13757-13759 2016

Preparation of Structural Coloring Material using Functional Black Substance

TAKEOKA Yukikazu

Hosokawa Powder Technology Foundation ANNUAL REPORT Vol. 24 ( 0 ) page： 66-69 - 69 2016

Language：English Publishing type：Research paper (scientific journal) Publisher：Hosokawa Powder Technology Foundation

Generally, we have an image that the structural colored material changes its hue depending on the direction of light irradiation and the viewing direction. I found that structural colored materials of various hues without angle dependence could be prepared from white and black materials. As a material, silica, titanium oxide, magnetite, and polymers can be used. We can obtain non-toxic and non-fading color materials at low cost using our materials, because the structural colored materials are composed of environment and people-friendly inexpensive materials. Moreover, because black materials exhibiting various functions such as conductivity, magnetic properties, photo-responsiveness, etc., functional colored materials utilizing these functions may be obtained.

DOI： 10.14356/hptf.14110

CiNii Research

Molecular weight dependency of polyrotaxane-cross-linked polymer gel extensibility Reviewed

Kana Ohmori, Imran Abu Bin, Takahiro Seki, Chang Liu, Koichi Mayumi, Kohzo Ito, Yukikazu Takeoka

CHEMICAL COMMUNICATIONS Vol. 52 ( 95 ) page： 13757 - 13759 2016

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

This work investigates the influence of the molecular weight of polyrotaxane (PR) cross-linkers on the extensibility of polymer gels. The polymer gels, which were prepared using PR cross-linkers of three different molecular weights but the same number of cross-linking points per unit volume of gel, have almost the same Young's modulus. By contrast, the extensibility and rupture strength of the polymer gels are substantially increased with increasing molecular weight of the PR cross-linker.

DOI： 10.1039/c6cc07641f

Web of Science

Scopus

PubMed

Stimulus-responsive colored materials for sensing and display devices

Yukikazu Takeoka

Springer Series in Materials Science Vol. 229 page： 33 - 50 2016

Language：English Publishing type：Part of collection (book) Publisher：Springer Verlag

In this chapter, two types of angle-independent colored systems are described that are achieved without using dyes and pigments: one is a colloidal amorphous array composed of fine colloidal particles, and the other is a phase-separated colored material based on the Christiansen effect. Stimuli-responsive systems using these materials are also introduced.

DOI： 10.1007/978-3-319-24990-2_2

Web of Science

Scopus

Thermally Tunable Hydrogels Displaying Angle-Independent Structural Colors Reviewed

Yumiko Ohtsuka, Takahiro Seki, Yukikazu Takeoka

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION Vol. 54 ( 51 ) page： 15368 - 15373 2015.12

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-V C H VERLAG GMBH

We report the preparation of thermally tunable hydrogels displaying angle-independent structural colors. The porous structures were formed with short-range order using colloidal amorphous array templates and a small amount of carbon black (CB). The resultant porous hydrogels prepared using colloidal amorphous arrays without CB appeared white, whereas the hydrogels with CB revealed bright structural colors. The brightly colored hydrogels rapidly changed hues in a reversible manner, and the hues varied widely depending on the water temperature. Moreover, the structural colors were angle-independent under diffusive lighting because of the isotropic nanostructure generated from the colloidal amorphous arrays.

DOI： 10.1002/anie.201507503

Web of Science

Scopus

PubMed

Thermally Tunable Angle-independent Structurally Coloured Hydrogels Reviewed

Ohtsuka, Y., Seki, T., Takeoka, Y

Angew. Chem. Int. Ed. page： in press 2015.12

Thermally Tunable Angle-independent Structurally Coloured Hydrogels Reviewed

Ohtsuka, Y, Seki, T, Takeoka, Y

Angew. Chem. Int. Ed. page： in press 2015.12

Making colors from black and white

Takeoka Yukikazu

ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY Vol. 250 page： . 2015.8

Making colors from black and white Reviewed

Yukikazu Takeoka

ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY Vol. 250 page： . 2015.8

Fusion materials for biomimetic structurally colored materials Reviewed

Yukikazu Takeoka

POLYMER JOURNAL Vol. 47 ( 2 ) page： 106 - 113 2015.2

Language：English Publishing type：Research paper (scientific journal) Publisher：NATURE PUBLISHING GROUP

This review addresses recent developments in structurally colored materials composed of submicrometer-sized fine particles, where the structural color is not angle-dependent. Recently, studies on colloidal crystals of submicrometer-sized fine particles for structurally colored materials applications have drawn great attention. Materials researchers have become aware that many living things exhibit bright structural colors that arise from amorphous arrays of particles, pores and fibers, and are now engaged in research related to this phenomenon. In particular, colloidal amorphous arrays composed of submicrometer-sized fine particles, which can display vivid structural color without angle dependence, have become a popular topic of study within recent years. In this paper, I review the possibility of using colloidal amorphous arrays as stimuli-responsive colored materials based on the properties of colloidal amorphous arrays that have been elucidated in recent experimental investigations.

DOI： 10.1038/pj.2014.125

Web of Science

Scopus

Preparation of Structurally Colored, Monodisperse Spherical Assemblies Composed of Black and White Colloidal Particles using a Micro Flow-Focusing Device Reviewed

Midori Teshima, Takahiro Seki, Ryuji Kawano, Shoji Takeuchi, Shinya Yoshioka, Yukikazu Takeoka

J. Materials Chemistry C, Vol. 3 page： 769-777 2015

Fusion Materials for Biomimetic Structurally Colored Materials Invited Reviewed

Y. Takeoka

Polymer Journal Vol. 47 page： 106-113 2015

Facile morphological control of fluorescent nano/microstructures via self-assembly and phase separation of trigonal azobenzenes showing aggregation-induced emission enhancement in polymer matrices Reviewed

Han, M., Takeoka, Y., Seki, T.

J. Materials Chemistry C, Vol. 3 page： 4093-4098 2015

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Papers - TAKEOKA, Yukikazu