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

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 20期

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.

引用

页数：4

共 31 条

[1] Boosting migration of large particles by solute contrasts
Abecassis, B.
Cottin-Bizonne, C.
Ybert, C.
Ajdari, A.
Bocquet, L.
[J]. NATURE MATERIALS, 2008, 7 (10) : 785 - 789
[2] Giant amplification of interfacially driven transport by hydrodynamic slip: Diffusio-osmosis and beyond
Ajdari, Armand
Bocquet, Lyderic
[J]. PHYSICAL REVIEW LETTERS, 2006, 96 (18)
[3] ANDERSON JL, 1989, ANNU REV FLUID MECH, V21, P61
[4] [Anonymous], 2012, Low Reynolds number hydrodynamics: with special applications to particulate media
[5] INTERACTION BETWEEN PARTICLES SUSPENDED IN SOLUTIONS OF MACROMOLECULES
ASAKURA, S
OOSAWA, F
[J]. JOURNAL OF POLYMER SCIENCE, 1958, 33 (126): : 183 - 192
[6] Induced-charge electrokinetic phenomena: Theory and microfluidic applications
Bazant, MZ
Squires, TM
[J]. PHYSICAL REVIEW LETTERS, 2004, 92 (06) : 661011 - 661014
[7] Does thermophoretic mobility depend on particle size?
Braibanti, Marco
Vigolo, Daniele
Piazza, Roberto
[J]. PHYSICAL REVIEW LETTERS, 2008, 100 (10)
[8] Trapping of DNA by thermophoretic depletion and convection
Braun, D
Libchaber, A
[J]. PHYSICAL REVIEW LETTERS, 2002, 89 (18) : 1 - 188103
[9] BROCHARD F, 1989, C R ACAD SCI 2, V293, P69
[10] Soret coefficients for aqueous polyethylene glycol solutions and some tests of the segmental model of polymer thermal diffusion
Chan, J
Popov, JJ
Kolisnek-Kehl, S
Leaist, DG
[J]. JOURNAL OF SOLUTION CHEMISTRY, 2003, 32 (03) : 197 - 214

← 1 2 3 4 →