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We investigate critical phenomena in colloids by means of therenormalization-group based hierarchical reference theory of fluids (HRT). Wefocus on three experimentally relevant model systems: namely, theAsakura-Oosawa model of a colloidal dispersion under the influence ofpolymer-induced attractive depletion forces; fluids with competing short-rangeattractive and longer-range repulsive interactions; solutions of star-polymerswhose pair potential presents both an attractive well and an ultrasoftrepulsion at shorter distance. Our results show that the ability to tune theeffective interactions between colloidal particles allows one to generate avariety of crossovers to the asymptotic critical behavior, which are notobserved in atomic fluids.

Nonuniversal routes to universality: Critical phenomena in colloidal dispersions