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Effect of Drying on Viscoelasticity and Permeability of Gel

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 on the viscoelastic relaxation behavior and permeability of a two-step acid-base catalyzed silica gel. Both the elastic modulus (E) and the permeability (D) showed a power-law dependence on density (ρ): E ～ ρm, m ≈ 3.0; D ～ ρ-n, n ≈ 2.5. The viscosity of the network rose from ～1011 to ～1013 Pa·s, and was strongly dependent on age as well as density of the gel. The viscoelastic relaxation function was well described by the stretched exponential function with an exponent of 0.3–0.5.

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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