We measure optically the dynamics of the nematic order parameter S induced by an electric field in the isotropic phase of the nematogenic 4{'}-n-pentyl-4-cyanobiphenyl. Using S as a thermometer, we observe transient heating and cooling when orientational order is induced, or decays. This electrothermal effect is quantitatively explained by the reversible entropy exchanges between the orientational degree of freedom and the bulk.
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Lelidis et al. (1996) studied this question.
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