Biaxial order parameter in the homologous series of orthogonal bent-core smectic liquid crystals.

Biaxial order parameter in the homologous series of orthogonal bent-core smectic liquid crystals.
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正交弯核近晶液晶同系系列中的双轴有序参数。

DOI:
10.1103/physreve.88.012504
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发表时间:
2013
期刊:
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子:
--
通讯作者:
Sreenilayam S
Sreenilayam S
中科院分区:
--
文献类型:
--
作者:
Sreenilayam S

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单轴液晶状态的基本参数几乎决定了它所有的物理性质,它是分子长轴相对于指导者的主要取向顺序参数()。双轴液晶具有双轴序参数,这取决于系统的相对称性。本文证明了在一级近似下,双轴正交近晶相可以用两个一级序参数来描述:分子的长轴和短轴的序参数。通过测量由弯核非手性分子构建的一系列LCs的非倾斜极性反铁电(Sm-)相的光学双折射和双轴性,采用Haller外推技术获得了温度依赖性。对于这样的双轴近晶相,两者,特别是后者的温度依赖关系,正在实验中确定。结果表明,弯曲岩心组成的正交近晶相明显大于Sm-calamatic LCs。
The fundamental parameter of the uniaxial liquid crystalline state that governs nearly all of its physical properties is the primary orientational order parameter () for the long axes of molecules with respect to the director. The biaxial liquid crystals (LCs) possess biaxial order parameters depending on the phase symmetry of the system. In this paper we show that in the first approximation a biaxial orthogonal smectic phase can be described by two primary order parameters:for the long axes andfor the ordering of the short axes of molecules. The temperature dependencies ofandare obtained by the Haller's extrapolation technique through measurements of the optical birefringence and biaxiality on a nontilted polar antiferroelectric (Sm-) phase of a homologous series of LCs built from the bent-core achiral molecules. For such a biaxial smectic phase bothand, particularly the temperature dependency of the latter, are being experimentally determined. Results show thatin the orthogonal smectic phase composed of bent cores is higher than in Sm-calamatic LCs andis also significantly large.
DOI: 10.1103/physrevlett.75.1803
发表时间: 1995-08-28
影响因子: 8.6
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