Interparticle potential and drag coefficient in nematic colloids

被引：89

作者：

Kotar, Jurij

Vilfan, Mojca

Osterman, Natan

Babic, Dusan

Copic, Martin

Poberaj, Igor

机构：

[1] Univ Ljubljana, Dept Phys, SI-1000 Ljubljana, Slovenia

[2] Jozef Stefan Inst, SI-1000 Ljubljana, Slovenia

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.96.207801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Magneto-optic tweezers were used for measurements of liquid-crystal-mediated forces between spherical beads with tangential anchoring in thin nematic samples. Repulsive force, which results from the quadrupolar symmetry of defects around the immersed beads, decreases proportionally to 1/x(6), with x being the bead separation. The velocity with which the particles are pushed apart also follows the same separation dependence. We thus find the effective drag coefficient gamma(eff) independent of x for surface-to-surface distances as small as 10% of the bead diameter.

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页数：4

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