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A general class of nonadditive sticky-hard-sphere binary mixtures, wheresmall and large spheres represent the solvent and the solute, respectively, isintroduced. The solute-solute and solvent-solvent interactions are ofhard-sphere type, while the solute-solvent interactions are ofsticky-hard-sphere type with tunable degrees of size nonadditivity andstickiness. Two particular and complementary limits are studied usinganalytical and semi-analytical tools. The first case is characterized by zerononadditivity, lending itself to a Percus-Yevick approximate solution fromwhich the impact of stickiness on the spinodal curves and on the effectivesolute-solute potential is analyzed. In the opposite nonadditive case, thesolvent-solvent diameter is zero and the model can then be reckoned as anextension of the well-known Asakura-Oosawa model with additional stickysolute-solvent interaction. This latter model has the property that its exacteffective one-component problem involves only solute-solute pair potentials forsize ratios such that a solvent particle fits inside the interstitial region ofthree touching solutes. In particular, we explicitly identify the threecompeting physical mechanisms (depletion, pulling, and bridging) giving rise tothe effective interaction. Some remarks on the phase diagram of these twocomplementary models are also addressed through the use of the Noro-Frenkelcriterion and a first-order perturbation analysis. Our findings suggestreentrance of the fluid-fluid instability as solvent density (in the firstmodel) or adhesion (in the second model) is varied. Some perspectives in termsof the interpretation of recent experimental studies of microgels adsorbed ontolarge polystyrene particles are discussed.

Bridging and depletion mechanisms in colloid-colloid effective interactions: A reentrant phase diagram