Charging of Heated Colloidal Particles Using the Electrolyte Seebeck Effect

被引:39
作者
Majee, Arghya [1 ]
Wuerger, Alois
机构
[1] Univ Bordeaux, Lab Ondes & Matiere Aquitaine, F-33405 Talence, France
关键词
CARBON NANOTUBES; DNA-MOLECULES; SEPARATION; TRANSPORT; ELECTROPHORESIS; THERMOPHORESIS;
D O I
10.1103/PhysRevLett.108.118301
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We propose a novel actuation mechanism for colloids, which is based on the Seebeck effect of the electrolyte solution: Laser heating of a nonionic particle accumulates in its vicinity a net charge Q, which is proportional to the excess temperature at the particle surface. The corresponding long-range thermoelectric field E proportional to 1/r(2) provides a tool for controlled interactions with nearby beads or with additional molecular solutes. An external field E-ext drags the thermocharged particle at a velocity that depends on its size and absorption properties; the latter point could be particularly relevant for separating carbon nanotubes according to their electronic band structure.
引用
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页数:4
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