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

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

2005-08-17

arxiv.org/abs/cond-mat/0508403v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.95.195703

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$(n {\geq} 3)$ criticality are excluded.

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