Burelbach, J;
Zupkauskas, M;
Lamboll, R;
Lan, Y;
Eiser, E;
(2017)
Colloidal motion under the action of a thermophoretic force.
Journal of Chemical Physics
, 147
(9)
, Article 094906. 10.1063/1.5001023.
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Abstract
We present thermophoretic measurements in aqueous suspensions of three different polystyrene (PS) particles of varying negative charge, size, and surface coating. Our measurement technique is based on the observation of the colloidal steady-state distribution using conventional bright-field microscopy, which avoids undesirable effects such as laser-induced convection or local heating. We find that the colloids with the weakest zeta potential exhibit the strongest thermophoretic effect, suggesting that the Soret coefficient has a more intricate dependence on surface functionality than predicted by existing theoretical approaches. We also study the relaxation of the colloids to steady-state and propose a model to quantify the relaxation speed, based on the time evolution of the colloidal center of mass. Our observations are well described by this model and show that the relaxation speed tends to increase with the magnitude of the thermophoretic force.
| Type: | Article |
|---|---|
| Title: | Colloidal motion under the action of a thermophoretic force |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/1.5001023 |
| Publisher version: | https://doi.org/10.1063/1.5001023 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Science & Technology, Physical Sciences, Chemistry, Physical, Physics, Atomic, Molecular & Chemical, Chemistry, Physics, FIELD-FLOW FRACTIONATION, THERMAL-DIFFUSION, PARTICLE THERMOPHORESIS, MICELLAR-SOLUTIONS, TEMPERATURE, SORET |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10077218 |
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