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Soret motion of a charged spherical colloid
Authors:Rasuli Seyyed Nader  Golestanian Ramin
Affiliation:School of the Physics, Institute for Theoretical Physics and Mathematics (IPM), P.O. Box 19395-5531, Tehran, Iran. rasuli@mail.ipm.ir
Abstract:
The thermophoretic motion of a charged spherical colloidal particle and its accompanying cloud of counterions and coions in a temperature gradient is studied theoretically. Using the Debye-Hückel approximation, the Soret drift velocity of a weakly charged colloid is calculated analytically. For highly charged colloids, the nonlinear system of electrokinetic equations is solved numerically, and the effects of high surface potential, dielectrophoresis, and convection are examined. Our results are in good agreement with some of the recent experiments on highly charged colloids without using adjustable parameters.
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