Manipulation of Colloids by a Nonequilibrium Depletion Force in a Temperature Gradient

被引:206
|
作者
Jiang, Hong-Ren [1 ]
Wada, Hirofumi [2 ]
Yoshinaga, Natsuhiko [1 ]
Sano, Masaki [1 ]
机构
[1] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan
[2] Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan
关键词
PARTICLES; DIFFUSIOPHORESIS;
D O I
10.1103/PhysRevLett.102.208301
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The nonequilibrium 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 nonuniform polymer distribution sustained by the polymer's thermophoresis. These results show how to control the thermophoretic properties of colloids.
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收藏
页数:4
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