Electro-optic effects of colloidal crystals of polymer-modified silica spheres immobilized with gelator |
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Authors: | Kiyoshi Shibata Hiroshi Kimura Akira Tsuchida Tsuneo Okubo Shohei Sato Kohji Yoshinaga |
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Institution: | (1) Department of Applied Chemistry, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan;(2) Institute for Colloidal Organization, 3-1-112 Hatoyama, Uji, Kyoto 611-0012, Japan;(3) Cooperative Research Center, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan;(4) Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensui, Tobata, Kitakyusyu 804-8550, Japan |
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Abstract: | Electro-optic responses of colloidal crystals consist of poly(maleic anhydride-co-styrene)-modified silica spheres (P(MA-ST)/SiO2) in acetonitrile and the crystals immobilized with a gelator, N-benzyloxycarbonyl-L-isoleucilaminooctadecane (Z-L-Ile-C-18), are studied by reflected-light intensity measurements and time-resolved reflection spectroscopy. Application of
an alternating electric field deforms P(MA-ST)/SiO2 crystal lattices reversibly. The response waveforms from the crystals are dependent on the frequency and strength of the
applied electric field; similar dependencies have been qualitatively observed for the colloidal crystals consisting of polystyrene
or silica spheres in aqueous media in our previous studies. Both gelated and ungelated P(MA-ST)/SiO2 crystals change the reflection intensity, however, the amplitude is larger for the latter. The small response for the gelated
P(MA-ST)/SiO2 crystals is attributed to the higher elastic modulus (G). The G value of the gelated P(MA-ST)/SiO2 crystals in acetonitrile is estimated from the change in the inter-sphere distance to be 8.0 Pa, which is about 2.3 and 2.4
times larger than that for ungelated P(MA-ST)/SiO2 crystals in acetonitrile and colloidal silica crystals in aqueous media, respectively. |
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Keywords: | Colloidal crystal Electro-optic effect Immobilization Gelator Bragg reflection Reflection spectra |
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