LY, Aboubakry; MAJEE, Arghya; WÜRGER, Alois

doi:10.1088/1367-2630/aaa266

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LY, Aboubakry
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

MAJEE, Arghya
Max-Planck-Institut für Intelligente Systeme
Institute fürTheoretische Physik IV

WÜRGER, Alois
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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New Journal of Physics. 2018, vol. 20, p. 025001

Institute of Physics: Open Access Journals

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We theoretically study the Seebeck effect in the vicinity of a heated metal nanostructure, such as the cap of an active Janus colloid in an electrolyte, or gold-coated interfaces in optofluidic devices. The thermocharge accumulated at the surface varies with the local temperature, thus modulating the diffuse part of the electric double layer. On a conducting surface with non-uniform temperature, the isopotential condition imposes a significant polarization charge within the metal. Surprisingly, this does not affect the slip velocity, which takes the same value on insulating and conducting surfaces. Our results for specific-ion effects agree qualitatively with recent observations for Janus colloids in different electrolyte solutions. Comparing the thermal, hydrodynamic, and ion diffusion time scales, we expect a rich transient behavior at the onset of thermally powered swimming, extending to microseconds after switching on the heating.< Leer menos

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Nanoscale Seebeck effect at hot metal nanostructures

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