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Universality of ionic criticality: size- and charge-asymmetric electrolytes
Young C Kim1, Michael E Fisher, Athanassios Z Panagiotopoulos
1Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA.
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- less than or approximately equal 6. For z=1 Ising-type behavior prevails. Unbiased estimates of Tc(lambda) are within 1% of previous (biased) estimates but the critical densities are approximately 5% lower. Ising character is also established for the 2:1 and 3:1 equisized models, along with critical amplitudes and improved Tc estimates. For z=3, however, strong finite-size effects reduce the confidence level although classical and O (n>or=3) criticality are excluded.
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