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We investigate the response to temperature of a well-known colloid-polymermixture. At room temperature, the critical value of the second virialcoefficient of the effective interaction for the Asakura-Oosawa model predictsthe onset of gelation with remarkable accuracy. Upon cooling the system, theeffective attractions between colloids induced by polymer depletion arereduced, because the polymer radius of gyration is decreases as thetheta-temperature is approached. Paradoxically, this raises the effectivetemperature, leading to "melting" of colloidal gels. We find the Asakura-Oosawamodel of effective colloid interactions with a simple description of thepolymer temperature response provides a quantitative description of thefluid-gel transition. Further we present evidence for enhancement ofcrystallisation rates near the metastable critical point.

Temperature as an external field for colloid-polymer mixtures : "quenching" by heating and "melting" by cooling