Abstract
We present an experimental study of phase separations in aqueous colloidal suspensions caused by dissolved, nonadsorbing polymer. The polymer to particle size ratio and the polymer and particle concentrations were varied independently. A statistical mechanical theory successfully predicts the fluid-solid transition and the density of the coexisting phases for the larger particle to polymer size ratio ( a r s = 6.9 ). For the smaller ratio ( a r s = 1.9 ), the theory anticipates the observed fluid-fluid transition but at a much lower polymer concentration than that measured.
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