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Macroporous Silica and Alkylene-Bridged Polysilsesquioxane Gels with Templated Nanopores

Published online by Cambridge University Press:  01 February 2011

Kazuki Nakanishi
Kazuki Nakanishi*
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University Nishikyo-ku, Kyoto 615–8510, JAPAN PRESTO, JST, JAPAN
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Abstract

Gels with hierarchical well-defined macropores and supramolecularly templated mesopores have been synthesized in the systems of pure silica as well as organic-inorganic hybrids. Cationic surfactants such as alkyltrimethylammonium salts and nonionic surfactants such as poly(ethyleneglycol)-poly(propyleneglycol)- poly(ethyleneglycol) triblock copolymers, EOPOEO, were found to be effective for pure silica system both in inducing the phase separation to give macroporous morphology and in templating the mesopores within a narrow distribution width. The partial introduction of methyl-modified alkoxide into the pure silica system lead to increased phase separation tendency accompanied by the disturbance of the supramolecular templating of mesopores. By contrast, in the 1,2-bis(trimethoxysilyl)ethane systems, poly(ethylene glycol) and EOPOEO were much better additive to induce phase separation in spite of the presence of internal hydrocarbon chain. Combination of well-defined macropores and supramolecularly templated mesopores has been achieved by selecting an appropriate molecular weight and concentration of EOPOEO in the starting composition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 788: Symposium L – Continuous Nanophase and Nanostructured Materials , 2003 , L7.5
Copyright
Copyright © Materials Research Society 2004

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References

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