Sommaire:

In recent years thermally or chemically active Janus particles have become a toy model for artificial microswimmers, which move in their self-generated temperature or concentration gradients. The driving mechanisms are poorly understood, and often even the direction of the motion lacks a rationale so far. Here we discuss the thermal forces acting on charged particles with non-uniform surface temperature.
Comparison with experiment suggests the importance of the thermoelectric effect in the electric double layer.

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