Phase equilibria of size-asymmetric primitive model electrolytes

The low-temperature phase coexistence of size-asymmetric primitive model el ectrolyte solutions has been investigated by means of Monte Carlo simulatio ns. Binodal curves and critical parameters are reported as a function of si ze ratio lambda = sigma (i) / sigma (-) in the range 0.05 to 1. Both the cr itical temperature and the: critical density are found to decrease as A dec reases. These trends are in conflict with available theoretical predictions . For highly asymmetric systems, the depression of the critical parameters is accompanied by the formation of large chainlike and ringlike structures, thereby giving rise to considerable finite-size effects.