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Issue 36, 2013
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Thermophoresis of charged colloidal rods

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Abstract

The thermal diffusion behavior of dilute solutions of very long and thin, charged colloidal rods (fd-virus particles) is studied using a holographic grating technique. The Soret coefficient of the charged colloids is measured as a function of the Debye screening length, as well as the rod-concentration. The Soret coefficient of the fd-viruses increases monotonically with increasing Debye length, while there is a relatively weak dependence on the rod-concentration when the ionic strength is kept constant. An existing theory for thermal diffusion of charged spheres is extended to describe the thermal diffusion of long and thin charged rods, leading to an expression for the Soret coefficient in terms of the Debye length, the rod-core dimensions, and the surface charge density. The thermal diffusion coefficient of a charged colloidal rod is shown to be accurately represented, for arbitrary Debye lengths, by a superposition of spherical beads with the same diameter of the rod and the same surface charge density. The experimental Soret coefficients are compared with this and other theories, and are contrasted against the thermal diffusion behaviour of charged colloidal spheres.

Graphical abstract: Thermophoresis of charged colloidal rods

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Publication details

The article was received on 24 May 2013, accepted on 18 Jul 2013 and first published on 19 Jul 2013


Article type: Paper
DOI: 10.1039/C3SM51456K
Citation: Soft Matter, 2013,9, 8697-8704
  • Open access: Creative Commons BY license
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    Thermophoresis of charged colloidal rods

    Z. Wang, H. Kriegs, J. Buitenhuis, J. K. G. Dhont and S. Wiegand, Soft Matter, 2013, 9, 8697
    DOI: 10.1039/C3SM51456K

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