Abstract
Abstract The experiments presented in this paper give a way to the determination of two elastic constants K 11 and K 33 and one viscosity coefficient y 1 of a nematic liquid crystal. ac electric field stresses applied to a thin layer of nematic liquid crystal modify its cooperative molecular alignment. So, the electrically controlled rotation of molecules induces a variable birefringence as a function of applied voltage and time. The experimental results in relation with the static and dynamic behaviour lead to the determination of these previously static and dynamic behaviour lead to the determination of these previously stated parameters. Temperature dependence of these parameters is given in the nematic range.
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