Abstract
The interaction of polystyrene latex spheres with critical solvent mixtures has been studied for two solvent mixtures, each at a variety of solvent compositions, with colloidal particles of different radius, surface charge density and volume fraction. When the solvent is in its two-phase regime but near the critical temperature, the particles partition strongly into a preferred phase, the choice of phase depending on particle surface-charge-density alone. Deeper in the two phase regime, the particles migrate to the interface. In the one-phase region, there is a sizeable zone of aggregation for solvent mixtures on the side of the coexistence curve rich in the non-preferred liquid. This aggregation can be shown to be incompatible with both the Fisher-DeGennes mechanism and with mechanisms based on prewetting arguments.
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