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The non-equilibrium distribution of colloids in a polymer solution under atemperature gradient is studied experimentally. A slight increase of localtemperature by a focused laser drives the colloids towards the hot region,resulting in the trapping of the colloids irrespective of their ownthermophoretic properties. An amplification of the trapped colloid density withthe polymer concentration is measured, and is quantitatively explained byhydrodynamic theory. The origin of the attraction is a migration of colloidsdriven by a non-uniform polymer distribution sustained by the polymer'sthermophoresis. These results show how to control thermophoretic properties ofcolloids.

Manipulation of Colloids by Nonequilibrium Depletion Force in Temperature Gradient