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Using mesoscopic numerical simulations and analytical theory we investigatethe coarsening of the solvent structure around a colloidal particle emergingafter a temperature quench of the colloid surface. Qualitative differences inthe coarsening mechanisms are found, depending on the composition of the binaryliquid mixture forming the solvent and on the adsorption preferences of thecolloid. For an adsorptionwise neutral colloid, as function of time the phasebeing next to its surface alternates. This behavior sets in on the scale of therelaxation time of the solvent and is absent for colloids with strongadsorption preferences. A Janus colloid, with a small temperature differencebetween its two hemispheres, reveals an asymmetric structure formation andsurface enrichment around it, even if the solvent is within its one-phaseregion and if the temperature of the colloid is above the critical demixingtemperature $T_c$ of the solvent. Our phenomenological model turns out tocapture recent experimental findings according to which, upon laserillumination of a Janus colloid and due to the ensuing temperature gradientbetween its two hemispheres, the surrounding binary liquid mixture develops aconcentration gradient.

Solvent coarsening around colloids driven by temperature gradients