ESLAHIAN, Kyriakos A.; MAJEE, Arghya; MASKOS, Michael; WÜRGER, Alois

doi:10.1039/C3SM52779D

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ESLAHIAN, Kyriakos A.
Fraunhofer ICT-IMM [ICT-IMM]
BAM Bundesanstalt für Materialforschung u. -prüfung

MAJEE, Arghya
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Max Planck Institute for Intelligent Systems [Tübingen]
Institut für Theoretische Physik [Braunschweig]

MASKOS, Michael
Fraunhofer ICT-IMM [ICT-IMM]

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Soft Matter. 2014-02-27, vol. 10, p. 1931-1936

Royal Society of Chemistry

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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.< Réduire

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Specific salt effects on thermophoresis of charged colloids

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