Hauptseite > Publikationsdatenbank > Influence of temperature and charge effects on thermophoresis of polystyrene beads > print

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100 1 _ |a Syshchyk, Olga
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245 _ _ |a Influence of temperature and charge effects on thermophoresis of polystyrene beads
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520 _ _ |a We study the thermodiffusion behavior of spherical polystyrene beads with a diameter of 25 nm by infra-red thermal diffusion Forced Rayleigh Scattering (IR-TDFRS). Similar beads were used to investigate the radial dependence of the Soret coefficient by different authors. While Duhr and Braun [P. Natl. Acad. Sci. USA, 104 (2007) 9346] observed a quadratic radial dependence Braibanti {\em et al.} [Phys. Rev. Lett., 100 (2008) 108303] found a linear radial dependence of the Soret coefficient. We demonstrated that special care needs to be taken to obtain reliable thermophoretic data, because the measurements are very sensitive to surface properties. The colloidal particles were characterized by transmission electron microscopy and dynamic light scattering (DLS) experiments were performed. We carried out systematic thermophoretic measurements as a function of temperature, buffer and surfactant concentration. The temperature dependence was analyzed using an empirical formula. To describe the Debye length dependence we used a theoretical model by Dhont. The resulting surface charge density is in agreement with previous literature results. Finally, we analyze the dependence of the Soret coefficient on the concentration of the anionic surfactant sodium dodecyl sulfate (SDS), applying an empirical thermodynamic approach accounting for chemical contributions.
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700 1 _ |a Afanasenkau, Dzmitry
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700 1 _ |a Wang, Zilin
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700 1 _ |a Kriegs, Hartmut
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700 1 _ |a Buitenhuis, Johan
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700 1 _ |a Wiegand, Simone
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