Abstract
The resistance to shear flow is investigated theoretically for polar liquid crystals, such as 4-n-octyl-4′-and 4-n-octyloxy-4′-cyanobiphenyls. It is established that the lowest resistance to shear flow at temperatures in the vicinity of the nematic-smectic A phase transition point T NA is observed when the nematic director is oriented perpendicular to both the flow velocity vector and the flow velocity gradient. The three Miesowicz shear viscosity coefficients ηi (i=1–3) at temperatures close to the phase transition temperature (tens of millikelvins from T NA ) and far from this transition are calculated in the framework of the Ericksen-Leslie theory. The decrease in the viscosity coefficients in the order η2>η1>η 3 is explained by the fact that fluctuations of the local smectic order in the nematic phase lead to a singular behavior of the viscosity coefficient η2, whereas the other two viscosity coefficients η1 and η3 are not affected by order parameter fluctuations.
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Translated from Fizika Tverdogo Tela, Vol. 46, No. 8, 2004, pp. 1504–1508.
Original Russian Text Copyright © 2004 by Zakharov, Vakulenko.
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Zakharov, A.V., Vakulenko, A.A. Rapid viscous flow of a nematic liquid crystal in the vicinity of the nematic-smectic A transition. Phys. Solid State 46, 1548–1553 (2004). https://doi.org/10.1134/1.1788793
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DOI: https://doi.org/10.1134/1.1788793