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Macroporous Morphology Induced by Phase Separation in Sol-Gel Systems Derived from Titania Colloid

Published online by Cambridge University Press:  01 February 2011

Junko Konishi ,
Koji Fujita ,
Kazuki Nakanishi  and
Kazuyuki Hirao
Junko Konishi
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyotodaigakukatsura, Nishikyo-ku, Kyoto 615–8510, Japan.
Koji Fujita
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyotodaigakukatsura, Nishikyo-ku, Kyoto 615–8510, Japan.
Kazuki Nakanishi
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyotodaigakukatsura, Nishikyo-ku, Kyoto 615–8510, Japan.
Kazuyuki Hirao
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyotodaigakukatsura, Nishikyo-ku, Kyoto 615–8510, Japan.
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Abstract

Macroporous titania gels have been prepared by the sol-gel method starting from aqueous colloidal dispersion of titania. The use of titania sol instead of highly reactive titanium alkoxide allows us to control the rate of gelation. Macroporous morphology is formed when the transitional structure of phase separation is fixed as permanent structures by the sol-gel transition. The domain size can be controlled reproducibly by changing the starting composition. The crystal structure of the titania gel is transformed from anatase to rutile through the heat treatment at 900°C, while the macroporous morphology remains unchanged.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 788: Symposium L – Continuous Nanophase and Nanostructured Materials , 2003 , L8.14
Copyright
Copyright © Materials Research Society 2004

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References

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