The fluid-fluid interface in a model colloid-polymer mixture: Application of grand canonical Monte Carlo to asymmetric binary mixtures

摘要

We present a Monte Carlo method to simulate asymmetric binary mixtures in thegrand canonical ensemble. The method is used to study the colloid-polymer modelof Asakura and Oosawa. We determine the phase diagram of the fluid-fluidunmixing transition and the interfacial tension, both at high polymer densityand close to the critical point. We also present density profiles in thetwo-phase region. The results are compared to predictions of a recent densityfunctional theory.