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arXiv 1006.4041cond-mat.soft
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疏水溶质对液-液临界点的影响

Effect of hydrophobic solutes on the liquid-liquid critical point

Dario Corradini, Sergey V. Buldyrev, Paola Gallo, H. Eugene Stanley

摘要:

Jagla斜坡粒子通过具有两个特征长度尺度的斜坡势相互作用,已知其体相热力学和动力学异常,类似于在水中发现的。Jagla颗粒还表现出分离低密度液相和高密度液相的相变线,终止于可以通过模拟研究的相图区域中的液-液临界点。采用分子动力学方法,研究了硬球(HS)在Jagla斜坡粒子形成的溶剂中的热力学和动力学。我们考虑HS摩尔分数x = 0.10、0.15和0.20的情况,以及x = 0.50的情况(HS和Jagla颗粒的1:1混合物)。我们发现了一个液-液临界点,直到最高HS摩尔分数;它的位置转移到更高的压力和更低的温度时,增加x。我们还发现,扩散系数异常似乎被保存所有的摩尔分数研究。

英文摘要:

Jagla ramp particles, interacting through a ramp potential with two characteristic length scales, are known to show in their bulk phase thermodynamic and dynamic anomalies, similar to what is found in water. Jagla particles also exhibit a line of phase transitions separating a low density liquid phase and a high density liquid phase, terminating in a liquid-liquid critical point in a region of the phase diagram that can be studied by simulations. Employing molecular dynamics computer simulations, we study the thermodynamics and the dynamics of solutions of hard spheres (HS) in a solvent formed by Jagla ramp particles. We consider the cases of HS mole fraction x = 0.10, 0.15 and 0.20, and also the case x = 0.50 (a 1:1 mixture of HS and Jagla particles). We find a liquid-liquid critical point, up to the highest HS mole fraction; its position shifts to higher pressures and lower temperatures upon increasing x. We also find that the diffusion coefficient anomalies appear to be preserved for all the mole fractions studied.

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