Manipulation of Colloids by Nonequilibrium Depletion Force in Temperature Gradient
Soft Condensed Matter
2015-05-13 v2
Abstract
The non-equilibrium distribution of colloids in a polymer solution under a temperature gradient is studied experimentally. A slight increase of local temperature by a focused laser drives the colloids towards the hot region, resulting in the trapping of the colloids irrespective of their own thermophoretic properties. An amplification of the trapped colloid density with the polymer concentration is measured, and is quantitatively explained by hydrodynamic theory. The origin of the attraction is a migration of colloids driven by a non-uniform polymer distribution sustained by the polymer's thermophoresis. These results show how to control thermophoretic properties of colloids.
Keywords
Cite
@article{arxiv.0902.4056,
title = {Manipulation of Colloids by Nonequilibrium Depletion Force in Temperature Gradient},
author = {Hong-Ren Jiang and Hirofumi Wada and Natsuhiko Yoshinaga and Masaki Sano},
journal= {arXiv preprint arXiv:0902.4056},
year = {2015}
}
Comments
4 pages, 5 figures