The heat capacity of the restricted primitive model electrolyte

Details The heat capacity of the restricted primitive model electrolyte The heat capacity of the restricted primitive model electrolyte

2000-11-21

arxiv.org/abs/cond-mat/0011359v1

J. Chem. Phys. 114, 5468 (2001)

Physics

Condensed Matter

Soft Condensed Matter

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

Scientific paper

10.1063/1.1359769

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.

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