Universality of Ionic Criticality: Size- and Charge-Asymmetric Electrolytes

Abstract

Grand canonical simulations designed to resolve critical universality classes are reported for $z$:1 hard-core electrolyte models with diameter ratios $\lambda =a_{+}/a_{-}\lesssim 6$. For $z=1$ Ising-type behavior prevails. Unbiased estimates of $T_c(\lambda )$ are within 1% of previous (biased) estimates but the critical densities are $\sim$5 % lower. Ising character is also established for the 2:1 and 3:1 equisized models, along with critical amplitudes and improved $T_c$ estimates. For $z=3$, however, strong finite-size effects reduce the confidence level although classical and O$(n\ge 3)$ criticality are excluded.

4 pages, 3 figures

References in corpus (4)

• Yang-Yang Anomalies and Coexistence Diameters: Simulation of Asymmetric Fluids
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