Manipulation of colloids by a nonequilibrium depletion force in a temperature gradient

Hong Ren Jiang, Hirofumi Wada, Natsuhiko Yoshinaga, Masaki Sano

研究成果: Article査読

164 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号208301
ジャーナルPhysical review letters
102
20
DOI
出版ステータスPublished - 2009 5 18
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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