arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1208.0693cond-mat.soft
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单组分体系的闭环汽液平衡

Closed-loop liquid-vapor equilibrium in a one-component system

N. G. Almarza

摘要:

我们报告蒙特卡罗模拟,显示在一个纯物质的闭环液-气平衡。据我们所知,这是第一次,这样的拓扑结构的相图已被发现的单组分系统。这一发现是在二维晶格模型上实现的,该模型用于可以形成网络流体的片状颗粒。我们已经考虑了具有稍微不同的斑块分布的相关模型,以便理解颗粒表面上的斑块分布的特征,这些特征使得闭环液-气平衡的存在成为可能,以及它与包含所谓空液体的相图的关系。最后,我们讨论了在连续介质中片状颗粒的三维模型中,在相关模型上找到闭环液-汽平衡的可能性,并推测了我们简单晶格模型的闭环液-汽平衡机制与复杂系统中盐诱导重入冷凝之间的可能关系。

英文摘要:

We report Monte Carlo simulations that show closed-loop liquid-vapor equilibrium in a pure substance. As far as we know, this is the first time that such a topology of the phase diagram has been found for one-component systems. This finding has been achieved on a two-dimensional lattice model for patchy particles that can form network fluids. We have considered related models with a slightly different patch distribution in the order to understand the features of the distribution of patches on the surface of the particles that make possible the presence of the closed-loop liquid-vapor equilibrium, and its relation with the phase diagram containing the so-called empty liquids. Finally we discuss the likelihood of finding the closed-loop liquid-vapor equilibria on related models for three dimensional models of patchy particles in the continuum, and speculate on the possible relationship between the mechanism behind the closed-loop liquid vapor equilibrium of our simple lattice model and the salt-induced reentrant condensation found in complex systems.

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