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Orientational order parameter of two cyano nematogens by optical spectroscopy

机译:光谱法测定两种氰基线虫的取向顺序参数

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摘要

Refractive index and density measurements of two cyano nematogens, namely p-hexyloxybenzylidene p-aminobenzonitrile and p-octyloxybenzylidene p-aminobenzonitrile have been carried out. From these data, orientational order parameter S has been estimated using different methods. Principal polarizabilities have been calculated using the well-known Vuks isotropic and Neugebauer anisotropic models. Polarizability anisotropy has been estimated using Lippincott delta-function, molecular vibration, Haller's extrapolation and Vuks scaling methods. Using these values, the orientational order parameter S has been estimated at different temperatures in their nematic phases. The values obtained have been compared and discussed. Further, using the experimental refractive index data, the nematic crossover temperatures have also been estimated for these compounds.
机译:已经进行了两种氰基线虫的折射率和密度的测量,即对己氧基苄叉基对氨基苄腈和对辛氧基苄叉基对氨基苄腈。从这些数据,已经使用不同的方法估计了取向顺序参数S。主极化率已使用著名的Vuks各向同性和Neugebauer各向异性模型进行了计算。已使用Lippincott三角函数,分子振动,Haller外推法和Vuks缩放方法估算了极化率各向异性。使用这些值,已经在向列相的不同温度下估计了取向顺序参数S。对获得的值进行了比较和讨论。此外,使用实验折射率数据,还已经估计了这些化合物的向列相交温度。

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