Journal Article

PreJuSER-56003

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Thermodiffusion of Charged Colloids: Single-Particle Diffusion

Dhont, J. K. G.FZJ* ; Wiegand, S.FZJ* ; Duhr, S. ; Braun, D.

2007
ACS Publ. Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/2609  doi:10.1021/la062184m

Abstract: An expression for the single-particle thermal diffusion coefficient of a charged colloidal sphere is derived on the basis of force balance on the Brownian time scale in combination with thermodynamics. It is shown that the single-particle thermal diffusion coefficient is related to the temperature dependence of the reversible work necessary to build the colloidal particle, including the core, the solvation layer, and the electrical double layer. From this general expression, an explicit expression for the contribution of the electrical double layer to the single-particle thermal diffusion coefficient is derived in terms of the surface charge density of the colloidal sphere, the electrostatic screening length, and its core radius, to within the Debye-Hückel approximation. This result is shown to explain experimental data, for both thin and thick double layers. In addition, a comparison with other theories is made.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Weiche Materie (IFF-7)

Research Program(s):

1. Kondensierte Materie (P54)

Appears in the scientific report 2007
Notes: This version is available at http://dx.doi.org/10.1021/la062184m Copyright © The American Chemical Society

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