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Paper   IPM / P / 8852
School of Physics
  Title:   Soret Motion of a Charged Spherical Colloid
1.  S.N. Rasuli
2.  R. Golestanian
  Status:   Published
  Journal: Phys. Rev. Lett.
  Vol.:  101
  Year:  2008
  Pages:   108301
  Supported by:  IPM
The thermophoretic motion of a charged spherical colloidal particle and its accompanying cloud of counterions and co-ions in a temperature gradient is studied theoretically. Using the Debye-H�uckel approximation, the Soret drift velocity of weakly charged colloids 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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