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Polymer induced phase coexistence in systems of lamellar phases

Richard P. Sear

cond-mat.softarXiv:cond-mat/9709205

Abstract

The effect of adding nonadsorbing polymer to a lamellar phase of surfactant bilayers is studied theoretically. We find that the polymer produces coexistence between two lamellar phases of different layer spacings. The coexistence region is a closed loop, as in the experiments of Ficheux et al. [J. de Physique II 5 823 (1995)]. Within our model the coexistence is driven by depletion.

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