2004 Fiscal Year Final Research Report Summary
Preparation of Photonic Crystals by Immobilization of Colloidal Crystals of Polymer-Modified Particles Formed in Organic Media
| Project/Area Number |
14350499
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
高分子構造・物性(含繊維)
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| Research Institution | Kyusyu Institute of Technology |
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Principal Investigator |
TOSHINAGA Kohji Kyusyu Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (00040436)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Colloidal crystals / Photonic crystals / Gelation / polymer grafting / Solidification / Particle array / Radical polymerization / Hybrid particles |
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| Research Abstract |
(1)Preparation of monodisperse, polymer-modified silica and colloidal crystallization in organic solvents
The preparation of poly(maleic anhydride-co-styrene)(P(MA-ST))-and poly(methyl methacrylate)(PMMA)-grafted silica was successfully achieved by the reaction of monodisperse colloidal silica, of 136 nm size, suspended in ethanol with corresponding polymer silane having trimethoxysilyl group. The particles of P(MA-ST)/SiO_2 and PMMA/SiO_2 made colloidal crystallization in polar organic solvents, such as acetonitrile or acetone. The dependences of the critical volume fraction for the crystallization on solvent polarity, amounts of grafted polymer or its molecular weight were disclosed.
(2)Immobilization of colloidal crystals in polymer gels
Photo-irradiated radical copolymerization of methyl methacrylate and 1,2-dimethacryloyloxyethane in the suspension forming colloidal crystals successfully gave organogels preserving the crystal structure. The addition of N-alkyl-L-amino acid derivatives to the suspension also afforded physical gels contained the crystals. The immobilization in the gels was recognized to be a promising procedure for making photonic crystals, because of no contraction during geling.
(3)Solidification of gel-immobilized colloidal crystals
The exchange of acetonitrile in the gel for vinylidene oxolane and following radical polymerization resulted in the formation of durable polymer containing particle array of the colloidal crystal structure. The particle array in the polymer block was observed by SEM and TEM spectroscopy. The solvent exchange with methyl methacrylate and the polymerization gave a transparent poly(methyl methacrylate) film containing silica particle array.
(4)Photo-electric effects of colloidal crystal gels
It was observed that applying alternating currency to the colloidal crystal gel induced oscillation of crystal lattice, which was suggested to be applicable to a photonic crystals.
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