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Characterization of hydrated silicate glass microballoons

Published online by Cambridge University Press:  31 January 2011

Hiroshi Isobe ,
Ichiro Tokunaga ,
Noriyoshi Nagai  and
Katsumi Kaneko
Hiroshi Isobe
Affiliation:
Technical Center, Fuji Chemical Co., Ltd., Nakatsugawa 509–91, Japan
Ichiro Tokunaga
Affiliation:
Department of Chemistry, Faculty of Science, Chiba University, Chiba 263, Japan
Noriyoshi Nagai
Affiliation:
Department of Chemistry, Faculty of Science, Chiba University, Chiba 263, Japan
Katsumi Kaneko
Affiliation:
Department of Chemistry, Faculty of Science, Chiba University, Chiba 263, Japan
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Abstract

Glass microballoons (GB) of about 1 μm in diameter were prepared by ultrasonic spray pyrolysis from sodium silicate solution. A silica-rich type of glass microballoons (SB) was prepared by acid treatment of GB. The structural changes of both microballoons with thermal treatment up to 973 K were examined. Both GB and SB showed properties similar to hydrated sodium silicate glass, to some extent. SB was more thermally stable than GB, but the spherical structures of both microballoons were collapsed by heating at 973 K; cristobalite was observed in samples heated at 973 K. The loosely and tightly incorporated water molecules evolved up to 573 K and near 850 K, respectively. The crystallization of cristobalite caused tightly incorporated water molecules to develop. The ultramicropores accessible only to H2O molecules in SB gradually decreased by heating and disappeared by heating at 773 K.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 11 , November 1996 , pp. 2908 - 2915
Copyright
Copyright © Materials Research Society 1996

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References

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