二维Yukawa流体的相平衡和界面性质
Phase equilibria and interfacial properties of two-dimensional Yukawa fluids
摘要：
对二维软Yukawa流体进行了分子动力学模拟，分析了相互作用范围对共存密度和线张力的影响。研究了不同温度下单组分吸引流体和含正负粒子的等摩尔混合物的汽-固、汽-液相稳定区。当相互作用范围减小时，吸引单组分体系的临界温度降低。然而，对于带电的混合物，它会增加，这种相反的行为被理解为在这些系统中占主导地位的排斥相互作用。二维流体的稳定相图定义为衰减参数λ的值小于三维流体的衰减参数λ的值。二维吸引单组分流体在λ<3时具有稳定的液-汽相图，而三维情况下即使在λ<15时也观察到稳定性。在携带相反电荷的颗粒的等摩尔混合物中观察到相同的趋势。
英文摘要：
Molecular dynamics simulations of two-dimensional soft Yukawa fluids are performed to analyze the effect that the range of interaction has on coexisting densities and line tension. The attractive one-component fluid and equimolar mixtures containing positive and negative particles are studied at different temperatures to locate the region where the vapor-solid and vapor-liquid phases are stable. When the range of interaction decreases, the critical temperature of the attractive one-component systems decreases. However, for the charged mixtures it increases, and this opposite behaviour is understood in terms of the repulsive interactions which are dominant for these systems. The stable phase diagram of two-dimensional fluids is defined for smaller values of the decay parameter λ than that of fluids in three dimensions. The two-dimensional attractive one-component fluid has stable liquid-vapor phase diagram for values of λ<3, in contrast to the three-dimensional case, where stability has been observed even for values of λ<15. The same trend is observed in equimolar mixtures of particles carrying opposite charges.
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