Levitation, lift, and bidirectional motion of colloidal particles in an electrically driven nematic liquid crystal

被引：129

作者：

Pishnyak, O. P. ^{[1
]}

Tang, S.

Kelly, J. R.

Shiyanovskii, S. V.

Lavrentovich, O. D.

机构：

[1] Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA

[2] Kent State Univ, Chem Phys Interdisciplinary Program, Kent, OH 44242 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 12期

关键词：

22;

D O I：

10.1103/PhysRevLett.99.127802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study electric-field-induced dynamics of colloids in a nematic cell, experimentally and by computer simulations. Solid particles in the nematic bulk create director distortions of dipolar type. Elastic repulsion from the walls keeps the particles in the middle of cell. The ac electric field reorients the dipoles and lifts them to top or bottom, depending on dipole orientation. Once near the walls, the colloids are carried along two antiparallel horizontal directions by nematic backflow. Computer simulations of the backflow agree with the experiment.

引用

页数：4

共 22 条

[11] Electrorotation of colloidal particles in liquid crystals -: art. no. 031704 [J].

Liao, G ;

Smalyukh, II ;

Kelly, JR ;

Lavrentovich, OD ;

Jákli, A .

PHYSICAL REVIEW E, 2005, 72 (03)

[12] Topological defects and interactions in nematic emulsions [J].

Lubensky, TC ;

Pettey, D ;

Currier, N ;

Stark, H .

PHYSICAL REVIEW E, 1998, 57 (01) :610-625

[13] Two-dimensional micromanipulation using liquid crystals [J].

Mieda, Y ;

Furutani, K .

APPLIED PHYSICS LETTERS, 2005, 86 (10) :1-3

[14] Microsphere manipulation using ferroelectric liquid crystals [J].

Mieda, Y ;

Furutani, K .

PHYSICAL REVIEW LETTERS, 2005, 95 (17)

[15] Novel colloidal interactions in anisotropic fluids [J].

Poulin, P ;

Stark, H ;

Lubensky, TC ;

Weitz, DA .

SCIENCE, 1997, 275 (5307) :1770-1773

[16] Friction drag on a particle moving in a nematic liquid crystal [J].

Ruhwandl, RW ;

Terentjev, EM .

PHYSICAL REVIEW E, 1996, 54 (05) :5204-5210

[17] Three-dimensional imaging of orientational order by fluorescence confocal polarizing microscopy [J].

Smalyukh, II ;

Shiyanovskii, SV ;

Lavrentovich, OD .

CHEMICAL PHYSICS LETTERS, 2001, 336 (1-2) :88-96

[18] Recent developments in the field of colloidal dispersions in nematic liquid crystals: the Stokes drag [J].

Stark, H ;

Ventzki, D ;

Reichert, M .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2003, 15 (01) :S191-S196

[19] Philip Saffman and viscous flow theory [J].

Stone, HA .

JOURNAL OF FLUID MECHANICS, 2000, 409 :165-183

[20] Effect of director distortions on morphologies of phase separation in liquid crystals [J].

Voloschenko, D ;

Pishnyak, OP ;

Shiyanovskii, SV ;

Lavrentovich, OD .

PHYSICAL REVIEW E, 2002, 65 (06) :1-060701

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