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High field 1H NMR Studies of Sol-Gel Kinetics

Published online by Cambridge University Press:  28 February 2011

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

High resolution 1H NMR spectroscopy at high magnetic fields is employed to study the reaction kinetics of the Si(OCH3)4:CH3OH:H2O sol-gel system. Both the overall extent of reaction as a function of time and the equilibrium distribution of species are measured. In acid catalyzed solution, condensation is the rate limiting step while in base catalyzed solution, hydrolysis becomes rate limiting. A kinetic model in which the rate of hydrolysis is assumed to be independent of the adjacent functional groups is presented. This model correctly predicts the distribution of product species during the initial stages of the sol-gel reaction.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 73: Symposium H – Better Ceramics Through Chemistry II , 1986 , 157
Copyright
Copyright © Materials Research Society 1986

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References

REFERENCES

1. Assink, R. A. and Kay, B. D., Mat. Res. Soc. Symp. Proc. 32, 301 (1984).CrossRefGoogle Scholar
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3. Brinker, C. J., Keefer, K. D., Schaefer, D. W., Assink, R. A., Kay, B. D., and Ashley, C. S., J. Non-Crystalline Solids 63, 45 (1984).Google Scholar
4. Kay, B. D. and Assink, R. A., manuscript in preparation.Google Scholar