Universität zu Köln

Syshchyk, Olga, Afanasenkau, Dzmitry, Wang, Zilin, Kriegs, Hartmut ORCID: 0000-0001-5856-1618, Buitenhuis, Johan ORCID: 0000-0001-8849-2596 and Wiegand, Simone ORCID: 0000-0001-6333-1956 (2016). Influence of temperature and charge effects on thermophoresis of polystyrene beads. Eur. Phys. J. E, 39 (12). NEW YORK: SPRINGER. ISSN 1292-895X

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Abstract

We study the thermodiffusion behavior of spherical polystyrene beads with a diameter of 25nm 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Syshchyk, Olga UNSPECIFIED UNSPECIFIED UNSPECIFIED Afanasenkau, Dzmitry UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, Zilin UNSPECIFIED UNSPECIFIED UNSPECIFIED Kriegs, Hartmut UNSPECIFIED orcid.org/0000-0001-5856-1618 UNSPECIFIED Buitenhuis, Johan UNSPECIFIED orcid.org/0000-0001-8849-2596 UNSPECIFIED Wiegand, Simone UNSPECIFIED orcid.org/0000-0001-6333-1956 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-252251
DOI:	10.1140/epje/i2016-16129-y
Journal or Publication Title:	Eur. Phys. J. E
Volume:	39
Number:	12
Date:	2016
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1292-895X
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FIELD-FLOW FRACTIONATION; THERMAL-DIFFUSION; LIQUID-MIXTURES; COLLOIDS; SORET; THERMODIFFUSION; SUSPENSIONS; DEPENDENCE; GRADIENT; POLYMER Multiple languages Chemistry, Physical; Materials Science, Multidisciplinary; Physics, Applied; Polymer Science Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25225