Phase behavior in binary fluid mixtures with spherical and non-spherical interactions

We have carried out extensive MD simulations to study the T vs. $\rho$ phase diagram and the mix-demix transition in fluid binary mixtures with (1) Lennard-Jones, (2) Stock-Mayer and (3) Gay-Berne molecular interactions. This analysis is performed in terms of the miscibility parameter, $\alpha=\epsilon_{AB}/\epsilon_{AA}$, with $\epsilon_{AA}=\epsilon_{BB}$. When the miscibility of the mixture is in the range $0<\alpha<1$, a continuous critical line of consolute points appears. This line interscts the LV coexistence curve at different positions depending on the value of $\alpha$, yielding mainly three different topologies for the phase diagrams. We also carried out a detailed study of the interfacial properties as function of $T$ and $\alpha$.