Phase Separation in Sol-Gel Systems of Organic-Inorganic Hybrids

Abstract:

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Organic-inorganic hybrid monoliths with well-defined macropores and/or mesopores have been synthesized by a sol-gel process accompanied by polymerization-induced phase separation. Using aklyltrialkoxysilanes and alkylene-bridged alkoxysilanes, two different categories of organo-siloxane networks have been characterized in view of macroporoisity based on phase separation as well as mesoporosity based on supramolecular templating by surfactants. The alkyl-terminated polysiloxane network exhibited substantial surface hydrophobicity together with the mechanical flexibility. On the other hand, the alkylene-bridged network behaved much more similarly to those prepared from tetraalkoxysilanes with regard to surface hydrophilicity, mechanical rigidness and mesopore-forming ability. Supramolecular templating of mesopores embedded in the gel skeletons comprising well-defined macroporous network has proven to give wide variety of hierarchically designed macro-mesoporous organic-inorganic hybrid materials.

Info:

Periodical:

Edited by:

P. VINCENZINI

Pages:

759-768

DOI:

10.4028/www.scientific.net/AST.45.759

Citation:

K. Nakanishi and K. Kanamori, "Phase Separation in Sol-Gel Systems of Organic-Inorganic Hybrids", Advances in Science and Technology, Vol. 45, pp. 759-768, 2006

Online since:

October 2006

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Price:

$35.00

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