The heat capacity of the restricted primitive model electrolyte

Abstract

The constant-volume heat capacity, C_V(T, rho), of the restricted primitive model (RPM) electrolyte is considered in the vicinity of its critical point. It is demonstrated that, despite claims, recent simulations for finite systems do not convincingly indicate the absence of a divergence in C_V(T, rho)--which would point to non-Ising-type criticality. The strong qualitative difference between C_V for the RPM and for a Lennard-Jones fluid is shown to result from the low critical density of the former. If one considers the theoretically preferable configurational heat-capacity density, C_V/V, the finite-size results for the two systems display qualitatively similar behavior on near-critical isotherms.

5 Pages, including 5 EPS figures. Also available as PDF file at http://pallas.umd.edu/~luijten/erikpubs.html

References in corpus (1)

• Crossover Scales at the Critical Points of Fluids with Electrostatic Interactions

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• Asymmetric Fluid Criticality II: Finite-Size Scaling for Simulations
• Field-theoretic description of ionic crystallization in the restricted primitive model
• Lattice Models of Ionic Systems with Charge Asymmetry
• Computer simulations of the restricted primitive model at very low temperature and density
• Universality class of the critical point in the restricted primitive model of ionic systems
• Gas-liquid critical point in ionic fluids
• Crossover behavior in fluids with Coulomb interactions