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Energetics, Composition, and Structure of Alkoxide Derived Silica Gels

Published online by Cambridge University Press:  25 February 2011

P. Maniar ,
A. Navrotsky ,
E. M. Rabinovich ,
D. L. Wood  and
N. A. Kopylov
P. Maniar
Affiliation:
Princeton University, Dept. of Geol. & Geophy. Sa, Princeton, NJ 08544
A. Navrotsky
Affiliation:
Princeton University, Dept. of Geol. & Geophy. Sa, Princeton, NJ 08544
E. M. Rabinovich
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974
D. L. Wood
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974
N. A. Kopylov
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974
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Abstract

Acid and base catalyzed alkoxide silica gels are studied by simultaneous DSC/DTGA under oxidizing and oxygen-free conditions and by intrared spectroscopy. The results are utilized to determine the composition of the dried gels and to estimate the extent of the net hydrolysis reaction. Our results suggest that, with sufficient water, condensation of partially hydrolyzed TEOS is the dominant reaction at high pH whereas, at low pH hydrolysis is rapid, relatively complete and precedes condensation. Thus the dry gels formed at high pH, with sufficient water, contain more alkoxy groups and fewer hydroxyl groups bound to Si than the dry gels formed at low pH.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 121: Symposium H – Better Ceramics Through Chemistry III , 1988 , 323
Copyright
Copyright © Materials Research Society 1988

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References

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