Biaxial surface order dynamics in calamitic nematics

被引：16

作者：

Lombardo, G. ^{[1
]}

Amoddeo, A. ^{[2
]}

Hamdi, R. ^{[3
]}

Ayeb, H. ^{[3
,4
]}

Barberi, R. ^{[1
,3
]}

机构：

[1] Univ Calabria, CNR IPCF UOS Cosenza, I-87036 Arcavacata Di Rende, Italy

[2] Univ Mediterranea Reggio Calabria, Dept Mat & Mech, I-89122 Reggio Di Calabria, Italy

[3] Univ Calabria, Dept Phys, I-87036 Arcavacata Di Rende, Italy

[4] Univ Tunis El Manar, Fac Sci Tunis, Lab Phys Matiere Molle, Dept Phys, Tunis 2092, Tunisia

来源：

EUROPEAN PHYSICAL JOURNAL E | 2012年 / 35卷 / 05期

关键词：

LIQUID-CRYSTALS; POINT-DEFECTS;

D O I：

10.1140/epje/i2012-12032-y

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Thermotropic nematic materials relax strong distortions by lowering the nematic order: the uniaxial symmetry is broken and is locally replaced by biaxial domains. We investigated the dynamics of the nematic order near a boundary surface of an asymmetric pi-cell submitted to an external electric field, close to the electric order reconstruction threshold. An unexpected phenomenon is observed close, but below the threshold: the biaxial order spreads on the surface inducing a consequent bulk topological behaviour equivalent to the splay-bend fast transition allowed by order reconstruction at higher voltage.

引用

页数：6

共 35 条

[1] Relaxation of director reorientations in nanoconfined liquid crystal: Dynamic light scattering investigation [J].