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Issue 12, 2014
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Specific salt effects on thermophoresis of charged colloids

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Abstract

We study the Soret effect of charged polystyrene particles as a function of temperature and electrolyte composition. As a main result we find that the Soret coefficient is determined by charge effects, and that non-ionic contributions are small. In view of the well-known electric-double layer interactions, our thermal field-flow fractionation data lead us to the conclusion that the Soret effect originates to a large extent from diffusiophoresis in the salt gradient and from the electrolyte Seebeck effect, both of which show strong specific-ion effects. Moreover, we find that thermophoresis of polystyrene beads is fundamentally different from proteins and aqueous polymer solutions, which show a strong non-ionic contribution.

Graphical abstract: Specific salt effects on thermophoresis of charged colloids

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Article information


Submitted
04 Nov 2013
Accepted
12 Dec 2013
First published
13 Dec 2013

Soft Matter, 2014,10, 1931-1936
Article type
Paper

Specific salt effects on thermophoresis of charged colloids

K. A. Eslahian, A. Majee, M. Maskos and A. Würger, Soft Matter, 2014, 10, 1931
DOI: 10.1039/C3SM52779D

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