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Effect of Drying on Viscoelasticity and Permeability ofGel

Published online by Cambridge University Press:  21 February 2011

George W. Scherer
George W. Scherer*
Affiliation:
Du Pont Co., Experimental Station 356/384, Wilmington, DE 19880 USA
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Abstract

The beam-bending method was used to measure the effect of partial drying onthe viscoelastic relaxation behavior and permeability of a two-stepacid-base catalyzed silica gel. Both the elastic modulus(E) and the permeability (D) showed apower-law dependence on density (ρ): E ～ ρm, m ≈ 3.0; D ～ ρ-n, n ≈ 2.5. The viscosity of the network rosefrom ～1011 to ～1013 Pa·s, and was strongly dependenton age as well as density of the gel. The viscoelastic relaxation functionwas well described by the stretched exponential function with an exponent of0.3–0.5.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 209
Copyright
Copyright © Materials Research Society 1998

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References

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