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arXiv 1507.03537cond-mat.stat-mech
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广义Lennard-Jones势的对应态定律

Corresponding states law for a generalized Lennard-Jones potential

P. Orea, A. Romero-Martínez, E. Basurto, C. A. Vargas, G. Odriozola

摘要:

最近的研究表明,来自Mie和Yukawa模型的汽-液共存密度崩溃,定义一个单一的主曲线时,表示在相应的温度和在临界点的约化的第二维里系数之间的差异。在这项工作中,我们进一步测试这个建议的另一个推广的伦纳-琼斯对潜力。这是进行汽-液共存密度,表面张力,和蒸汽压,沿温度窗口设置低于临界点。为了这个目的,我们进行分子动力学模拟通过改变潜在的软度参数,以产生从非常短到中间的吸引力范围。我们观察到所有的属性都崩溃并产生主曲线。此外,汽液曲线被发现共享的确切形状的三重和吸引Yukawa。此外,蒸汽压的表面张力和对数是约化的第二维里系数的这种差异的线性函数。

英文摘要:

It was recently shown that vapor-liquid coexistence densities derived from Mie and Yukawa models collapse to define a single master curve when represented against the difference between the reduced second virial coefficient at the corresponding temperature and that at the critical point. In this work we further test this proposal for another generalization of the Lennard-Jones pair potential. This is carried out for vapor-liquid coexistence densities, surface tension, and vapor pressure, along a temperature window set below the critical point. For this purpose we perform molecular dynamics simulations by varying the potential softness parameter to produce from very short to intermediate attractive ranges. We observed all properties to collapse and yield master curves. Moreover, the vapor-liquid curve is found to share the exact shape of the Mie and attractive Yukawa. Furthermore, the surface tension and the logarithm of the vapor pressure are linear functions of this difference of reduced second virial coefficients.

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