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.

引用

收藏

页数：4

相关论文

共 18 条

[11] Monte Carlo simulation of topological defects in the nematic liquid crystal matrix around a spherical colloid particle [J].

Ruhwandl, RW ;

Terentjev, EM .

PHYSICAL REVIEW E, 1997, 56 (05) :5561-5565

[12] Long-range forces and aggregation of colloid particles in a nematic liquid crystal [J].

Ruhwandl, RW ;

Terentjev, EM .

PHYSICAL REVIEW E, 1997, 55 (03) :2958-2961

[13] Elasticity-mediated self-organization and colloidal interactions of solid spheres with tangential anchoring in a nematic liquid crystal [J].

Smalyukh, II ;

Lavrentovich, OD ;

Kuzmin, AN ;

Kachynski, AV ;

Prasad, PN .

PHYSICAL REVIEW LETTERS, 2005, 95 (15)

[14] Optical trapping of colloidal particles and measurement of the defect line tension and colloidal forces in a thermotropic nematic liquid crystal [J].

Smalyukh, II ;

Kuzmin, AN ;

Kachynski, AV ;

Prasad, PN ;

Lavrentovich, OD .

APPLIED PHYSICS LETTERS, 2005, 86 (02) :021913-1

[15] Ordered droplet structures at the liquid crystal surface and elastic-capillary colloidal interactions [J].

Smalyukh, II ;

Chernyshuk, S ;

Lev, BI ;

Nych, AB ;

Ognysta, U ;

Nazarenko, VG ;

Lavrentovich, OD .

PHYSICAL REVIEW LETTERS, 2004, 93 (11) :117801-1

[16] Physics of colloidal dispersions in nematic liquid crystals [J].

Stark, H .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2001, 351 (06) :387-474

[17] Direct observation of anisotropic interparticle forces in nematic colloids with optical tweezers [J].

Yada, M ;

Yamamoto, J ;

Yokoyama, H .

PHYSICAL REVIEW LETTERS, 2004, 92 (18) :185501-1

[18] Transparent nematic phase in a liquid-crystal-based microemulsion [J].

Yamamoto, J ;

Tanaka, H .

NATURE, 2001, 409 (6818) :321-325