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Global Phase Diagrams of Mixed Surfactant-Polymer Systems at Interfaces Xavier Cha^tellier,, and David Andelman*,
 

Summary: Global Phase Diagrams of Mixed Surfactant-Polymer Systems at Interfaces
Xavier Cha^tellier,, and David Andelman*,
School of Physics and Astronomy, Raymond and BeVerly Sackler Faculty of Exact Sciences,
Tel AViV UniVersity, Tel AViV 69978 Israel, and Department of Materials and Interfaces,
Weizmann Institute of Science, RehoVot 76100 Israel
ReceiVed: December 12, 1995X
Insoluble surfactant monolayers at the air/water interface undergo a phase transition from a high-temperature
homogeneous state to a low-temperature demixed state, where dilute and dense phases coexist. Alternatively,
the transition from a dilute phase to a dense one may be induced by compressing the monolayer at constant
temperature. We consider the case where the insoluble surfactant monolayer interacts with a semidilute
polymer solution solubilized in the water subphase. The phase diagrams of the mixed surfactant/polymer
system are investigated within the framework of mean field theory. The polymer enhances the fluctuations
of the monolayer and induces an upward shift of the critical temperature. The critical concentration is increased
if the monomers are more attracted (or at least less repelled) by the surfactant molecules than by the bare
water/air interface. In the case where the monomers are repelled by the bare interface but attracted by the
surfactant molecules (or vice versa), the phase diagram may have a triple point. The location of the polymer
special transition line appears to have a big effect on the phase diagram of the surfactant monolayer.
1. Introduction
Understanding the subtle interactions between macromol-
ecules, such as polymer or proteins, and amphiphiles, such as

  

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

 

Collections: Materials Science; Physics