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hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorWÜRGER, Aloïs
dc.date.issued2016
dc.identifier.issn0031-9007
dc.description.abstractEnWe study hydrodynamic slowing-down of a particle moving in a temperature gradient perpendicular to a wall. At distances much smaller than the particle radius, h << a, lubrication approximation leads to the reduced velocity u/u0 = 3 h/a (ln(a/h) − 9/4), where u0 is the velocity in the bulk. With Brenner's result for confined diffusion, we find that the trapping efficiency, or effective Soret coefficient , increases logarithmically as the particle gets very close to the wall. Our results provide a quantitative explanation for the recently observed enhancement of thermophoretic trapping at short distances. Our discussion of parallel and perpendicular thermophoresis in a capillary, reveals a good agreement with experiments on charged polystyrene particles, and sheds some light on a controversy concerning the size-dependence and the non-equilibrium nature of the Soret effect.
dc.language.isoen
dc.publisherAmerican Physical Society
dc.rights.urihttp://creativecommons.org/licenses/by-nd/
dc.title.enHydrodynamic boundary effects on thermophoresis of confined colloids
dc.typeArticle de revue
dc.identifier.doi10.1103/PhysRevLett.116.138302
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Matière Molle [cond-mat.soft]
bordeaux.journalPhysical Review Letters
bordeaux.page138302
bordeaux.volume116
bordeaux.peerReviewedoui
hal.identifierhal-01289232
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01289232v1
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