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HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 45Phase Separation in Sol-Gel Systems of...

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

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Abstract:

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.

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Periodical:

Advances in Science and Technology (Volume 45)

Pages:

759-768

DOI:

https://doi.org/10.4028/www.scientific.net/AST.45.759

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Online since:

October 2006

Authors:

Kazuki Nakanishi, Kazuyoshi Kanamori

Keywords:

Organic-Inorganic Hybrid, Phase Separation, Porous Material, Sol-Gel (SG)

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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