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Characterization of Anatase Nanocrystal-Precipitated Coatings From (100 − x)SiO2·xTiO2 Gel Films Via The Sol-Gel Process with Boiling Hot Water Treatment

Published online by Cambridge University Press:  03 March 2011

Atsunori Matsuda
Affiliation:
Department of Materials Science, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan
Tatsuo Matoda
Affiliation:
Department of Applied Materials Science, Graduate School of Engineering, Osaka Prefecture University, Osaka 599-8531, Japan
Toshihiro Kogure
Affiliation:
Department of Earth and Planetary Sciences, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
Kiyoharu Tadanaga
Affiliation:
Department of Applied Materials Science, Graduate School of Engineering, Osaka Prefecture University, Osaka 599-8531, Japan
Tsutomu Minami
Affiliation:
Department of Applied Materials Science, Graduate School of Engineering, Osaka Prefecture University, Osaka 599-8531, Japan
Masahiro Tatsumisago
Affiliation:
Department of Applied Materials Science, Graduate School of Engineering, Osaka Prefecture University, Osaka 599-8531, Japan
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Abstract

Considerable amounts of anatase nanocrystals were formed on the (100 − x)SiO2·xTiO2 coatings with x of 16.5 and 25 mol% with boiling water treatment, whereas the formation of anatase nanocrystals was not clearly observed for the coatings with x of 50 and 75 mol%. Despite the lower TiO2 content, the coatings with x of 16.5 and 25 mol% showed higher concentration of Si–O–Ti bonds among the coatings. Thus, the hydrolysis of Si–O–Ti bonds and resultant sites should facilitate the nucleation and growth of anatase nanocrystals. High transparency, high photocatalytic activity, and superhydrophilicity were demonstrated for the anatase nanocrystals-precipitated coatings.

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Articles
Copyright
Copyright © Materials Research Society 2004

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References

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