NDLI: Influence of temperature and charge effects on thermophoresis of polystyrene beads⋆

Content Provider	Springer Nature Link
Author	Syshchyk, Olga Afanasenkau, Dzmitry Wang, Zilin Kriegs, Hartmut Buitenhuis, Johan Wiegand, Simone
Copyright Year	2016
Abstract	We study the thermodiffusion behavior of spherical polystyrene beads with a diameter of 25 nm by infrared 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 (Proc. Natl. Acad. Sci. U.S.A. 104, 9346 (2007)) observed a quadratic radial dependence Braibanti et al. (Phys. Rev. Lett. 100, 108303 (2008)) 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.
Starting Page	1
Ending Page	9
Page Count	9
File Format	PDF
ISSN	12928941
Journal	The European Physical Journal E
Volume Number	39
Issue Number	12
e-ISSN	1292895X
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-12-22
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Topical Issue: Non-isothermal transport in complex fluids Soft and Granular Matter, Complex Fluids and Microfluidics Biological and Medical Physics, Biophysics Surfaces and Interfaces, Thin Films Nanotechnology Polymer Sciences Complex Systems
Content Type	Text
Resource Type	Article
Subject	Chemistry Medicine Biophysics Materials Science Surfaces and Interfaces Biotechnology

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