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802 Langmuir 1988,4, 802-806 Theory of Microemulsions: Comparison with Experimental

Summary: 802 Langmuir 1988,4, 802-806
Theory of Microemulsions: Comparison with Experimental
M. E. Cates*
Institute for Theoretical Physics, University of California, Santa Barbara, California 93106
D. Andelmans and S. A. Safran
Corporate Research Science Laboratories, Exxon Research and Engineering Company,
Annandale, New Jersey 08801
D. Roux*J
Department of Chemistry and Biochemistry, University of California at Los Angeles,
Los Angeles, California 90024
Received January 26, 1988. I n Final Form: March 24, 1988
A thermodynamicmodel for microemulsions(previouslydescribed)is used topredictsome furtheraspecta
of the phase behavior. The stability of the microemulsion under variation of molecular parameters (such
asthe bendingconstantand spontaneouscurvature of the surfactantmonolayer)is discussed. An appropriate
cut through the multidimensionalparameter spaceyields the characteristic "fish" phase diagram,as found
experimentally. Our model exhibits a phase behavior close to the experimentalone, not only in terms of
the variation with surfactant concentration but also in terms of the sensitivity of the phase diagram to
the nature of the surfactant,particularly its spontaneouscurvature.
1. Introduction


Source: Andelman, David - School of Physics and Astronomy, Tel Aviv University


Collections: Materials Science; Physics