Abstract
The microscopic mechanism for thermodiffusion or the Ludwig–Soret effect is investigatedfor a single charged colloidal particle. For the specific example of a charged permeablemembrane, the different forces arising from the interplay between electrostatic interactionand entropy are identified and their magnitudes are calculated in both no-salt andsalt-saturated limits. The competition between these forces, which is controlledby the salt density, is shown to decide the direction of motion for the colloids.
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