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From experimental studies it is well-known that colloidal particles suspendedin a near-critical binary solvent exhibit interesting aggregation phenomena,often associated with colloidal phase transitions, and assumed to be driven bylong-ranged solvent mediated (SM) interactions (critical Casimir forces), setby the (diverging) correlation length of the solvent. We present the firstsimulation and theoretical study of an explicit model of a ternary mixture thatmimics this situation. Both the effective SM pair interactions and the fullternary phase diagram are determined for Brownian discs suspended in anexplicit two-dimensional supercritical binary liquid mixture. Gas-liquid andfluid-solid transitions are observed in a region that extends well-away fromcriticality of the solvent reservoir. We discuss to what extent an effectivepair-potential description can account for the phase behavior we observe. Ourstudy provides a fresh perspective on how critical fluctuations of the solventmight influence colloidal self-assembly.

Critical Casimir Forces and Colloidal Phase Transitions in a Near-Critical Solvent : A Simple Model Reveals a Rich Phase Diagram