Active and passive viscosities of a bent-core nematic liquid crystal

被引：5
|
作者：
Dhara, S. [1 ]
Balaji, Y. [1 ]
Ananthaiah, J. [1 ]
Sathyanarayana, P. [1 ]
Ashoka, V. [1 ]
Spadlo, A. [2 ]
Dabrowski, R. [2 ]
机构：
[1] Univ Hyderabad, Sch Phys, Hyderabad 500046, Andhra Pradesh, India
[2] Mil Univ Technol, Inst Chem, PL-00908 Warsaw, Poland
来源：
PHYSICAL REVIEW E | 2013年 / 87卷 / 03期
关键词：
SHEAR-FLOW;
D O I：
10.1103/PhysRevE.87.030501
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 the measurements of active and passive viscosities of a bent-core nematic liquid crystal. The active viscosity is measured using a rheometer and the passive viscosities are measured by measuring the self-diffusion coefficient of a microsphere in the aligned sample. The effective active viscosity is larger and the effect of presmectic fluctuations are observed much higher than the N-Sm-C transition temperature than commonly seen in calamitic liquid crystals. The temperature dependence of passive viscosities is stronger than that of active viscosities. The self-diffusion of the microsphere is reduced and appears to be non-Gaussian as the N-Sm-C transition is approached. The study of Brownian fluctuations is useful to understand the smectic fluctuations in bent-core nematic liquid crystals. DOI: 10.1103/PhysRevE.87.030501
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页数：5
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