Effect of drying on viscoelasticity and permeability of gel
Conference
·
OSTI ID:51563
- Du Pont Co., Wilmington, DE (United States)
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 ({rho}): E {approximately} {rho}{sup m} {approx} 3.0; D {approximately} {rho}{sup {minus}n}, n {approx} 2.5. The viscosity of the network rose from {approximately}10{sup 11} to {approximately}10{sup 13} Pa{center_dot}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.
- OSTI ID:
- 51563
- Report Number(s):
- CONF-940411--; ISBN 1-55899-246-4
- Country of Publication:
- United States
- Language:
- English
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