The static and dynamic behavior of the Frederiks transition for twist of a uniform planar nematic sample in an external magnetic field has been studied by monitoring the associated conoscopic figure. In particular, the decay of this figure after the field has been switched off is considered in detail in order to obtain results for the twist viscosity γ1. Results for the twist elastic constant K2 and for the viscosity γ1 are reported for the homologous series of p, p′-dialkylazoxybenzenes. K2 is found to be smaller than both K1 and K3, while K2 varies little along the series. The temperature dependence of γ1 can be described by a combination of an activated process and a term depending on the orientational order parameter.
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Dijk et al. (1983) studied this question.
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