Annihilation dynamics of umbilical defects in nematic liquid crystals under applied electric fields

被引：54

作者：

Dierking, I ^{[1
]}

Marshall, O ^{[1
]}

Wright, J ^{[1
]}

Bulleid, N ^{[1
]}

机构：

[1] Univ Manchester, Sch Phys & Astron, Manchester M13 9PL, Lancs, England

来源：

PHYSICAL REVIEW E | 2005年 / 71卷 / 06期

关键词：

D O I：

10.1103/PhysRevE.71.061709

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：

Umbilical defects were induced in a nematic liquid crystal with negative dielectric anisotropy, confined to Hele-Shaw cells with homeotropic boundary conditions, and their annihilation dynamics were investigated experimentally. Dynamic scaling laws, previously proposed for Schlieren defects, were verified also for electric field induced umbilical defects while varying external parameters, such as electric field amplitude, frequency, Hele-Shaw cell gap, and temperature. In all cases, scaling relations of rho(t)proportional to t(-1) for the defect density and D proportional to(t(0)-t)(1/2) for the defect pair separation were obtained, independent of external field parameters. The experimental results give evidence of the universality of scaling relations for the annihilation of topological defects in liquid crystals, extended to umbilical defects and their annihilation dynamics under applied external fields.

引用

页数：6

共 27 条

[1] THEORY OF PHASE-ORDERING KINETICS [J].

BRAY, AJ .

ADVANCES IN PHYSICS, 1994, 43 (03) :357-459

[2]

Chandrasekhar S., 1992, Liquid Crystals, V2nd ed.

[3] LATE-TIME COARSENING DYNAMICS IN A NEMATIC LIQUID-CRYSTAL [J].

CHUANG, I ;

TUROK, N ;

YURKE, B .

PHYSICAL REVIEW LETTERS, 1991, 66 (19) :2472-2479

[4] COSMOLOGY IN THE LABORATORY - DEFECT DYNAMICS IN LIQUID-CRYSTALS [J].

CHUANG, I ;

DURRER, R ;

TUROK, N ;

YURKE, B .

SCIENCE, 1991, 251 (4999) :1336-1342

[5] COARSENING DYNAMICS IN UNIAXIAL NEMATIC LIQUID-CRYSTALS [J].

CHUANG, I ;

YURKE, B ;

PARGELLIS, AN ;

TUROK, N .

PHYSICAL REVIEW E, 1993, 47 (05) :3343-3356

[6]

de Gennes P.-G., 1993, PHYS LIQUID CRYSTALS

[7]

Dierking I., 2003, TEXTURES LIQUID CRYS

[8] STRUCTURES OF POINT INTEGER DISCLINATIONS AND THEIR ANNIHILATION BEHAVIOR IN THERMOTROPIC LIQUID-CRYSTAL POLYESTERS [J].

DING, DK ;

THOMAS, EL .

MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1994, 241 :103-117

[9] Self-consistent model of an annihilation-diffusion reaction with long-range interactions [J].

Ginzburg, VV ;

Radzihovsky, L ;

Clark, NA .

PHYSICAL REVIEW E, 1997, 55 (01) :395-402

[10] ANNIHILATION RATE AND SCALING IN A 2-DIMENSIONAL SYSTEM OF CHARGED-PARTICLES [J].

JANG, WG ;

GINZBURG, VV ;

MUZNY, CD ;

CLARK, NA .

PHYSICAL REVIEW E, 1995, 51 (01) :411-417

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