Thermophoresis

Thermophoresis, also called thermodiffusion or Soret effect^[1], is the effect of a temperature gradient on particles, causing them to move from a hot plate to the cold. This effect is relevant to planetary differentiation and is exploited in the manufacturing of optical fiber and Uranium enrichment.

References

1. ^ Stefan Duhr, and Dieter Braun (2006). "Why molecules move along a temperature gradient". PNAS 103: 19678-19682. [1]