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Rotational viscosities γ1 are calculated for three Gay-Berne models for a wide range of state points in the nematic phase. There was a strong density dependence in the results, with γ1 increasing with increasing density. Away from the clearing point, the temperature dependence of γ1 was described by simple Arrhenius-like behaviour. A comparison of the values of γ1 and the Arrhenius activation energies with real mesogens pointed to a number of problems with the Gay-Beme potential, when used as a model for real mesogenic systems.
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Cuetos et al. (2002) studied this question.
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