Hydrodynamic boundary effects on thermophoresis of confined colloids
| hal.structure.identifier | Laboratoire Ondes et Matière d'Aquitaine [LOMA] | |
| dc.contributor.author | WÜRGER, Aloïs | |
| dc.date.issued | 2016 | |
| dc.identifier.issn | 0031-9007 | |
| dc.description.abstractEn | We 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.iso | en | |
| dc.publisher | American Physical Society | |
| dc.rights.uri | http://creativecommons.org/licenses/by-nd/ | |
| dc.title.en | Hydrodynamic boundary effects on thermophoresis of confined colloids | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1103/PhysRevLett.116.138302 | |
| dc.subject.hal | Physique [physics]/Matière Condensée [cond-mat]/Matière Molle [cond-mat.soft] | |
| bordeaux.journal | Physical Review Letters | |
| bordeaux.page | 138302 | |
| bordeaux.volume | 116 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01289232 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01289232v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Physical%20Review%20Letters&rft.date=2016&rft.volume=116&rft.spage=138302&rft.epage=138302&rft.eissn=0031-9007&rft.issn=0031-9007&rft.au=W%C3%9CRGER,%20Alo%C3%AFs&rft.genre=article |
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