The effect of three-body interactions on the liquid–liquid phase coexistence of binary fluid mixtures

The Gibbs ensemble algorithm is implemented to determine the liquid–liquid phase coexistence of binary fluid mixtures interacting via a two-body Lennard–Jones+three-body Axilrod–Teller potential. The contributions of both two-body and three-body interactions are calculated exactly. The addition of the Axilrod–Teller term can affect liquid–liquid miscibility substantially. In particular, Axilrod–Teller interactions have a large effect on the densities of the coexisting liquid phases.