In this paper is presented an extension of the density dependence in the Landau-de Gennes theory for the nematic to isotropic phase transition, taking into account this dependence for three phenomenological coefficients in the free energy expansion. In this manner, a better agreement between the calculated thermodynamic quantities and their experimental values was obtained near the nematic-isotropic phase transition. More, the theory leads to a better description of the temperature dependence of the order parameter in the same temperature range..

Keywords: density dependence, Landau-de Gennes theory, nematic-isotropic phase transition

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