title: Thermophoresis in colloidal suspensions driven by Marangoni forces.
abstract: In a hydrodynamic approach to thermophoretic transport in colloidal suspensions, the solute velocity u and the solvent flow v(r) are derived from Stokes' equation, with slip boundary conditions imposed by thermal Marangoni forces. The resulting fluid velocity field v(r) significantly differs from that induced by an externally driven particle. We find, in particular, that thermophoresis due to surface forces is insensitive to hydrodynamic interactions. As a consequence, the thermal diffusion coefficient D(T) of polymer solutions is independent of molecular weight and concentration.
authors.affiliation: CPMOH, CNRS-Université Bordeaux 1, 351 cours de la Libération, 33405 Talence, France.
authors.forename: Alois
authors.initials: A
authors.lastname: Würger
mesh_terms: D000465:Algorithms; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003102:Colloids / Q000737:chemistry*; D004058:Diffusion; D007700:Kinetics; D008863:Microspheres; D011108:Polymers / Q000737:chemistry; D013499:Surface Properties; D013535:Suspensions; D013816:Thermodynamics
chemical_list: D003102:Colloids; D011108:Polymers; D013535:Suspensions