Diffusion of colloidal particles in a tilted periodic potential: Theory versus experiment

被引：85

作者：

Evstigneev, Mykhaylo ^{[1
]}

Zvyagolskaya, Olga ^{[2
]}

Bleil, Stefan ^{[2
]}

Eichhorn, Ralf ^{[1
]}

Bechinger, Clemens ^{[2
]}

Reimann, Peter ^{[1
]}

机构：

[1] Univ Bielefeld, Fak Phys, D-33615 Bielefeld, Germany

[2] Univ Stuttgart, Inst Phys, D-70550 Stuttgart, Germany

来源：

PHYSICAL REVIEW E | 2008年 / 77卷 / 04期

关键词：

D O I：

10.1103/PhysRevE.77.041107

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We investigate the diffusion of a colloidal particle in a tilted periodic potential created by means of ten rotating optical tweezers arranged on a circle. Because of the viscous drag, the trap rotation leads to the onset of a tilting force in the corotating reference frame, so that in that frame the system can be described as an overdamped Brownian particle in a tilted periodic potential. The excellent agreement of the velocity and diffusion coefficient as a function of rotating frequency with theoretical predictions allowed us to extract the main parameters characterizing the system-the coefficient of free thermal diffusion and the potential corrugation depth-from the experimental results.

引用

页数：4

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