Non‐monotonic temperature dependence of the alignment of a nematic mixture on a ferroelectric substrate
Polarization optic techniques have been applied to study specific features of the anisotropic interaction between a dye‐doped eutectic mixture of nematic liquid crystals p ‐methoxybenzylidene‐ p ‐ n ‐butylaniline and p ‐ethoxybenzylidene‐ p ‐ n ‐butylaniline and a polar surface of a ferroelectric triglycine sulphate crystal over the temperature range including the substrate Curie point T c . It has been found that the temperature‐induced structural changes in the nematic layer in the vicinity of T c are related to the changes in the orientational part of the tensor order parameter Q ik . The temperature dependence of the director angle ¯, averaged over the nematic layer, has been obtained from the effective dichroism values of solute absorption. The experimental data were interpreted using the model, in which the anisotropic part of the surface energy has two terms with orthogonal easy axes.
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Document Type: Research Article
Affiliations: L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, 660036 Krasnoyarsk, Russia, 7(3912)494510, 7(3912)438923
Publication date: 01 June 2006