J. Phys. II France
Volume 4, Numéro 7, July 1994
Page(s) 1195 - 1207
DOI: 10.1051/jp2:1994194
J. Phys. II France 4 (1994) 1195-1207

Spinodal phase separation in complex fluids

F. Schmid1 and R. Blossey2

1  Department of Physics FM-15, University of Washington, Seattle WA 98195, U.S.A.
2  Institut für Theoretische Physik IV, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany

(Received 27 September 1993, revised 28 January 1994, accepted 25 March 1994)

We study the early stages of the phase separation of an amphiphilic system into two fluids, one structured and the other not, in the context of a one-component order-parameter model. A generalization of the Langer - Bar-on - Miller approximation permits the calculation of the time evolution of the structure function in the mixture. Near the structured-fluid side of the coexistence, we find that the spinodal is much more clearly observable and is closer to the binodal than on the unstructured side.

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