Abstract
Density effects at the nematic–isotropic phase transition is studied by means of Landau–de Gennes theory. The analysis shows that the density variation shifts the nematic–isotropic transition temperature T NI and changes the Landau–de gennes free energy expansion coefficients. The possibility of the tricritical behaviour of the nematic–isotropic phase transition is also discussed by the density variation. The low value of T NI -T* (T* is the absolute stability limit of the isotropic phase) and the various thermodynamic quantities are also calculated to compare with the experimental data.
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