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Syneresis in Silica Gel

Published online by Cambridge University Press:  25 February 2011

George W. Scherer
George W. Scherer*
Affiliation:
E.I. duPont de Nemours & Co., Central R&D Department, Experimental Station E356/384, Wilmington, DE 19898, USA
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Abstract

The driving force for syneresis is generally attributed to the same chemical reactions that produce gelation, but it has also been proposed that shrinkage could be driven by interracial energy. The latter possibility is explored and discounted. The kinetics of syneresis depend on the driving force, the mobility of the gel network, and the rate of fluid flow through the contracting gel. A model that allows for viscoelastic behavior of the gel and fluid flow according to Darcy's law is shown to provide a quantitatively accurate representation of the shape of the shrinkage curves and the dependence of the shrinkage rate on sample size.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 121: Symposium H – Better Ceramics Through Chemistry III , 1988 , 179
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

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