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Consolute Critical Phenomena in Dilute Silica Gel

Published online by Cambridge University Press:  15 February 2011

B. J. Frisken ,
Fabio Ferri  and
David S. Cannell
B. J. Frisken
Affiliation:
Department of Physics, University of California, Santa Barbara, CA 93106
Fabio Ferri
Affiliation:
Department of Physics, University of California, Santa Barbara, CA 93106
David S. Cannell
Affiliation:
Department of Physics, University of California, Santa Barbara, CA 93106
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Abstract

The effect of even dilute silica networks on the critical phenomena of binary liquid mixtures is profound. The network preferentially adsorbs one component, preventing a portion of the mixture from participating in critical fluctuations. Fluctuations in the remaining mixture are found to decay with a non-exponential correlation function near the consolute point. A correlation function consisting of the sum of an exponential decay and a non-exponential term of either an activated or stretched exponential form fits the data well. In the presence of the silica network, the mixtures are observed to phase separate near the critical temperature of the pure system, but while still in the one-phase region of the pure system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 290: Symposium N – Dynamics in Small Confining Systems , 1992 , 59
Copyright
Copyright © Materials Research Society 1993

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References

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