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Sol-Gel Kinetics: 29Si NMR and a Statistical Reaction Model*

Published online by Cambridge University Press:  25 February 2011

Roger A. Assitik  and
Bruce D. Kay
Roger A. Assitik
Affiliation:
Sandia National Laboratories Albuquerque, NM 87185, USA
Bruce D. Kay
Affiliation:
Sandia National Laboratories Albuquerque, NM 87185, USA
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Abstract

The early time behavior of an acid catalyzed Si(OCH3),4 (TMOS) sol-gel was studied by high resolution 29Si nuclear magnetic resonance (NMR). Both the water producing and the alcohol producing condensation reactions were found to contribute significantly to the overall condensation rate. A general theoretical kinetic formalism which specifically treats the temporal evolution of the various chemical function groups about a specific silicon atom was developed. The experimentally observed functional group distribution was in agreement with the distribution predicted by a simplified statistical reaction model. The mathematical framework for the study of chemical speciation at the next-to-nearest functional group level was developed. This framework was used to assign several fine structure resonances, and to show that the formation of various dimeric species is also largely statistical in nature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 121: Symposium H – Better Ceramics Through Chemistry III , 1988 , 25
Copyright
Copyright © Materials Research Society 1988

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Footnotes

*

This work performed at Sandia National Laboratories supported by the U. S. Department of Energy under contract number DE-AC04–76DP00789.

References

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