THE ROLE OF ATTRACTIVE FORCES IN DETERMINING THE THERMODYNAMIC PROPERTIES OF 2-DIMENSIONAL LENNARD-JONES FLUIDS

Computer simulations were performed to obtain the radial distribution function for two-dimensional Lennard-Jones fluids over a wide range of densities and temperatures and for different contributions of the att ractive forces. The repulsive and attractive intermolecular forces are separated following the Weeks-Chandler-Andersen perturbation theory. The influence of the attractive forces on the potential and internal e nergies, pressure, Helmholtz free energy and chemical potential was th en analysed. These results will be used in later studies of the influe nce of these forces on the vapour-liquid and solid-liquid coexistence curves, and on theoretical adsorption isotherms.