Abstract
Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078~Received 11 November 1996!We have studied the phase behavior of mixtures of a microemulsion and a nonadsorbing polymer. With avirial expansion we calculated the phase boundary curve of the mixture using an effective interaction potential,which includes both the polymer-induced depletion attraction and the square-well attraction between the baremicroemulsion droplets. The calculated phase boundary curve fits the phase measurements well. The fittedvalues of the interaction parameters for the square-well attraction are found to be in good agreement with theprevious neutron and light scattering results. The experiment demonstrates the effectiveness of using a polymerto probe the microscopic interactions in microemulsions and other non-hard-sphere colloidal suspensions.@S1063-651X~97!13405-5#PACS number~s!: 82.70.Kj, 82.70.Dd, 65.50.1m, 61.25.Hq.
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