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Phase Separation in Silica Sol-gel System Containing Anionic Surfactant

Published online by Cambridge University Press:  01 February 2011

Taisuke Matsui ,
Kazuki Nakanishi ,
Kazuyoshi Kanamori  and
Teiichi Hanada
Taisuke Matsui
Affiliation:
[email protected], Kyoto University, Graduate School of Chemistry, kitashirakawa, sakyo-ku, Kyoto, 606-8502, Japan, +81-75-753-7673, +81-75-753-7673
Kazuki Nakanishi
Affiliation:
[email protected], Kyoto University, Department of Chemistry, Graduate School of Science, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
Kazuyoshi Kanamori
Affiliation:
[email protected], Kyoto University, Department of Chemistry, Graduate School of Science, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
Teiichi Hanada
Affiliation:
[email protected], Kyoto University, Department of Chemistry, Graduate School of Science, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
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Abstract

By inducing phase separation parallel to the sol-gel transition of alkoxy-derived silica systems, silica monoliths with well-defined co-continuous macropores were obtained from the systems containing anionic surfactants. We adopted three kinds of anionic surfactants which differ from each other in the length of alkyl chain (CH3(CH2)17SO3Na, CH3(CH2)15SO3Na, CH3(CH2)13SO3Na). Mesopores were also found in the silica skeletons presumably by the supramolecular templating. Characterization of the dried or heat-treated samples was carried out by a scanning electron microscope (SEM) and nitrogen adsorption measurements. Experimental results showed that due to the moderate interaction between silica oligomers and surfactants, most of the surfactants are distributed to the solvent phase which determines the macropore volume. The median size and volume of the macropores could be controlled independently by the starting composition. In the absence of any additive to enhance templating by the surfactant, the samples exhibited only amorphous mesopores.

Keywords

microstructuresol-gelSi
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1056: Symposium HH – Nanophase and Nanocomposite Materials V , 2007 , 1056-HH11-60
Copyright
Copyright © Materials Research Society 2008

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References

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