Pseudopolar smectic-C phases of azo-substituted achiral bent-core hockey-stick-shaped molecules

被引:6
|
作者
Malkar, Deepshika [1 ]
Monika, M. [2 ]
Prasad, Veena [2 ]
Roy, Arun [1 ]
机构
[1] Raman Res Inst, CV Raman Ave, Bangalore 560080, Karnataka, India
[2] Ctr Nano & Soft Matter Sci, Bangalore 560013, Karnataka, India
关键词
LIQUID-CRYSTALS; SPONTANEOUS POLARIZATION; FREEDERICKSZ TRANSITION; MESOPHASES; MODEL; SMA;
D O I
10.1103/PhysRevE.101.012701
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
We report experimental studies on an azo-substituted compound consisting of bent-core hockey-stick-shaped molecules. The experimental results establish two pseudopolar tilted smectic phases, which are characterized by an in-plane axial-vector order parameter in addition to tilt order in the smectic layers. Electro-optical measurements in the mesophases indicate that the birefringence of the sample strongly depends on the applied electric field. We develop a theoretical model to account for this observation. The change in the birefringence of the sample arises from the field-induced reorientation of the tilt plane of the molecules in the layer above a threshold field. The effect is analogous to the field-induced Freedericksz transition which is quadratic in the applied electric field.
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页数:9
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