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Viscosity coefficients of partially aligned nematic and nematic discotic liquid crystals

Harald Ehrentraut, Siegfried Hess

Abstract

The affine transformation model---formulated for ellipsoidal particles with axis ratio Q and previously used for the calculation of the viscous properties of nematic liquid crystals with perfect orientation order---is generalized to realistic uniaxial phases with imperfect order (Maier-Saupe order parmeter S1). For the nematic liquid crystals N-(4'-methoxybenzylidene)-4-(n-butyl)aniline (MBBA) and p-methoxy-p'-n-butylazoxybenezene (N4) and some cyanobiphenyls (kCB and kOCB with k=5,8) a comparison of the theoretically obtained Miesowicz viscosities with experimental data is made.

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Key concepts: Liquid crystal, Biaxial nematic, MBBA, Materials science, Viscosity, Condensed matter physics, Rotational viscosity, Orientation (vector space)