This article is cited in 3 papers

Liquid crystals

Change in the polarizability of MBBA molecules upon the nematic-isotropic liquid transition and physical consequences

E. M. Aver'yanov

L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk

Abstract: The Lorentz tensor components $L_j$ and the polarizability tensor components $\gamma_j$ of 4-methoxyben-zylidene-4'-butylaniline (MBBA) liquid crystal molecules in nematic and isotropic phases have been determined experimentally. The quadratic dependences of the mean value $\bar{\gamma}(S)$ and anisotropy $\Delta\gamma(S)$ of the polarizability in the nematic phase on the orientational order parameter $S$ of molecules have been established. Within the phenomenological approach, the dependences $\bar{\gamma}(S)$ and $\Delta\gamma(S)$ have been derived, and their features for MBBA and other known objects have been interpreted. The relation of the dependences $\bar{\gamma}(S)$ and $\Delta\gamma(S)$ to the features of the nematic-isotropic liquid phase transition has been found.

Received: 18.03.2013

 English version: Physics of the Solid State, 2013, 55:10, 2136–2141

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