相分離を利用したシリカ-ジルコニア多孔質ゲルのモルフォロジー制御

概要

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Gels with interconnected porous morphology in micrometer range have been prepared in a silica-zirconia system containing 12.7 mass% of zirconia from metal alkoxides under coexistence of poly(ethylene oxide) (PEO) with an average molecular weight of 100000. The porous structure was formed when the transitional structure of spinodal decomposition was frozen-in by sol-gel transition of inorganic components. In the system, the driving force of phase separation was considered to be the repulsive interaction between solvent and PEO associated on inorganic oligomers. Although the addition of zirconium alkoxide has an effect to decrease the domain size of dried gel by the increase of condensation rate, the domain size could be controlled in the sizes ranging from 0.2 to 30 μm by adjusting the compositions of other constituents in the reacting solution.
社団法人日本セラミックス協会の論文
1998-08-01