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arXiv 1503.01252cond-mat.softcond-mat.stat-mechphysics.chem-ph
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离子流体的热性质和结构性质

Thermal and structural properties of ionic fluids

Hendrik Bartsch, Oliver Dannenmann, Markus Bier

摘要:

众所周知,离子流体中的静电相互作用产生特征相行为和结构。有时,它的长射程被提出来挑选出静电势,而不是其他射程较短的相互作用。在这里的重要性的范围的相行为和结构的离子流体的研究通过巨正则蒙特卡罗模拟的晶格限制的原始模型(LRPM)。长程静电相互作用相比,由尖锐和/或光滑的截止计划获得的各种类型的短程电位。发现锐截止静电势导致相行为和结构对截止半径的强烈依赖。然而,当结合一个合适的额外的平滑截止,短程LRPM被发现表现出定量相同的相行为和结构作为传统的长程LRPM。此外,Stillinger-Lovett完美屏蔽性质,这是众所周知的,由长程静电势产生的,也满足短程LRPM与光滑截止。通过表明离子流体的特征相行为和结构也可以在具有短程电位的系统中发现,可以得出结论,离子流体中静电电位的决定性性质不是长程电位,而是价态依赖性。

英文摘要:

The electrostatic interaction in ionic fluids is well-known to give rise to a characteristic phase behavior and structure. Sometimes its long range is proposed to single out the electrostatic potential over other interactions with shorter ranges. Here the importance of the range for the phase behavior and the structure of ionic fluids is investigated by means of grandcanonical Monte Carlo simulations of the lattice restricted primitive model (LRPM). The long-ranged electrostatic interaction is compared to various types of short-ranged potentials obtained by sharp and/or smooth cut-off schemes. Sharply cut off electrostatic potentials are found to lead to a strong dependence of the phase behavior and the structure on the cut-off radius. However, when combined with a suitable additional smooth cut-off, the short-ranged LRPM is found to exhibit quantitatively the same phase behavior and structure as the conventional long-ranged LRPM. Moreover, the Stillinger-Lovett perfect screening property, which is well-known to be generated by the long-ranged electrostatic potential, is also fulfilled by short-ranged LRPMs with smooth cut-offs. By showing that the characteristic phase behavior and structure of ionic fluids can also be found in systems with short-ranged potentials, one can conclude that the decisive property of the electrostatic potential in ionic fluids is not the long range but rather the valency dependence.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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