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arXiv 1302.2473cond-mat.softcond-mat.stat-mechphysics.chem-ph
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非加性直径离子流体的约束原始模型

The restricted primitive model of ionic fluids with nonadditive diameters

Riccardo Fantoni, Giorgio Pastore

摘要:

具有非加性硬球直径的约束原始模型具有有趣而独特的聚类性质。我们报告准确计算的集群浓度。实施高效和特设蒙特卡罗算法,我们确定的聚类和气液双结点的非加性的影响。对于负的非加性,倾向于完全重叠的极端情况下,不同的离子,占主导地位的集群是由偶数个粒子具有零总电荷。对于正的非加和性,类似粒子的分离和离子可用空间的减少倾向于在高密度下形成团簇。

英文摘要:

The restricted primitive model with nonadditive hard-sphere diameters is shown to have interesting and peculiar clustering properties. We report accurate calculations of the cluster concentrations. Implementing efficient and ad hoc Monte Carlo algorithms we determine the effect of nonadditivity on both the clustering and the gas-liquid binodal. For negative nonadditivity, tending to the extreme case of completely overlapping unlike ions, the prevailing clusters are made of an even number of particles having zero total charge. For positive nonadditivity, the frustrated tendency to segregation of like particles and the reduced space available to the ions favors percolating clusters at high densities.

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