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Statistical Thermodynamics of Phase Transitions in Surfactant Monolayer Films

Published online by Cambridge University Press:  21 February 2011

Robert S. Cantor
Robert S. Cantor*
Affiliation:
Dartmouth College, Department of Chemistry, Hanover, N.H. 03755
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Abstract

A lattice statistical mechanical method has recently been developed and used to predict structural and thermodynamic properties of fluid phases of surfactant monolayer films of uniform chain length. This mean-field approach is extended here to examine films of mixed chain length. As in the earlier work, a fluid-fluid (LC-LE) phase transition is predicted to occur at high surface densities. This transition is found to exhibit non-ideal mixing behavior, ranging from positive azeotropy to phase separation (in the LC phase) as the difference in chain lengths increases. In contrast, the phase diagram in the liquid-gas (LEG) transition region is predicted to exhibit almost ideal behavior, with a nearly linear bubble-point curve.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 177: Symposium V – Macromolecular Liquids , 1989 , 345
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

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