This title appears in the Scientific Report :
2016
Please use the identifier:
http://dx.doi.org/10.1140/epje/i2016-16129-y in citations.
Please use the identifier: http://hdl.handle.net/2128/25274 in citations.
Influence of temperature and charge effects on thermophoresis of polystyrene beads
Influence of temperature and charge effects on thermophoresis of polystyrene beads
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. Nat...
Saved in:
Personal Name(s): | Syshchyk, Olga |
---|---|
Afanasenkau, Dzmitry / Wang, Zilin / Kriegs, Hartmut / Buitenhuis, Johan / Wiegand, Simone (Corresponding author) | |
Contributing Institute: |
Weiche Materie; ICS-3 |
Published in: | The @European physical journal / E, 39 (2016) 12, S. 129 |
Imprint: |
Berlin
Springer
2016
|
DOI: |
10.1140/epje/i2016-16129-y |
Document Type: |
Journal Article |
Research Program: |
Functional Macromolecules and Complexes |
Link: |
Get full text Published on 2016-12-22. Available in OpenAccess from 2017-12-22. Published on 2016-12-22. Available in OpenAccess from 2017-12-22. Get full text |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/25274 in citations.
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. |