Elastic constants and orientational viscosities of a bent-core nematic liquid crystal
Elastic constants and orientational viscosities of a bent-core nematic liquid crystal
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DOI：
10.1103/physreve.83.031701
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发表时间：
2011-03-07
影响因子：
2.4
通讯作者：
Sprunt, S.
中科院分区：
文献类型：
--
作者：
Majumdar, M.;Salamon, P.;Sprunt, S.
本文用动态光散射和外加磁场和电场诱导的Freedericksz跃迁相结合的方法，测定了4-氯-1，3-亚苯基双4-[4 '-（9-癸烯氧基）苯甲酰氧基]苯甲酸酯的Frank弹性常数和有效取向粘度的绝对值。在低于各向同性-弯曲转变2 ℃的固定温度下，我们发现K-11 = 3.1 x 10（-12）N，K-22 = 0.31 x 10（-12）N，K-33 = 0.88 x 10（-12）N，eta（splay）= 1.1 Pa s，eta（twist）= 0.37 Pa s，eta（弯曲）= 1.2 Pa s。这些参数的不寻常的各向异性进行了讨论，在短范围内，近晶-C-样的相关性分子之间的α相。
Using a combination of dynamic light scattering and Freedericksz transitions induced in applied magnetic and electric fields, we have determined the absolute magnitudes of the Frank elastic constants and effective orientational viscosities of the bent-core nematic liquid crystal, 4-chloro-1,3-phenylene bis 4-[4'-(9-decenyloxy)benzoyloxy] benzoate. At a fixed temperature 2 degrees C below the isotropic-nematic transition, we find K-11 = 3.1 x 10(-12) N, K-22 = 0.31 x 10(-12) N, K-33 = 0.88 x 10(-12) N, eta(splay) = 1.1 Pa s, eta(twist) = 0.37 Pa s, and eta(bend) = 1.2 Pa s. The unusual anisotropies of these parameters are discussed in terms of short-range, smectic-C-like correlations among molecules in the nematic phase.