Thermodynamics of electrolytes on anisotropic lattices

The restricted primitive model (RPM) on tetragonal lattices was studied using grand canonical Monte Carlo simulations and histogram reweighting technique. The correct lattice Coulomb potential was used and an Ewald-like summation was utilized to account for the long-range nature of electrostatic interactions. Tricritical parameters were determined to be increasing functions of anisotropy parameters which is consistent with theoretical calculations based on the Debye-Hu̇ckel approach. The results show the presence of a two-dimensional-like behavior at large anisotropies from which the dimensionless tricritical temperature and density for the two-dimensional square lattice electrolyte were estimated.