arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1006.0033cond-mat.stat-mechcond-mat.soft
收藏

吸引相互作用对二尺度势的热力学、动力学和结构反常的影响

Effects of attractive interactions in the thermodynamic, dynamic and structural anomalies of a two length scale potential

Jonathas Nunes da Silva, Evy Salcedo, Alan Barros de Oliveira, Marcia C. Barbosa

摘要:

利用分子动力学模拟方法研究了粒子质点系通过一个连续的核软化势相互作用的过程,该势由一个硬核、一个最近距离处的肩和一个较远距离处的吸引势阱组成。我们得到了该系统的压力-温度相图的不同深度的可调吸引阱。由于这是一个两个长度尺度的潜力,密度,扩散和结构异常的预期。我们表明,增加分子之间的吸引力的相互作用的效果是收缩的区域中的密度和扩散异常的压力。如果引力太强,粒子将主要处于两个长度尺度之一,没有观察到扩散异常密度。构造异常区在所有情况下都存在。

英文摘要:

Using molecular dynamic simulations we study a system of particles interacting through a continuous core-softened potentials consisting of a hard core, a shoulder at closest distances and an attractive well at further distance. We obtain the pressure-temperature phase diagram of of this system for various depths of the tunable attractive well. Since this is a two length scales potential, density, diffusion and structural anomalies are expected. We show that the effect of increasing the attractive interaction between the molecules is to shrink the region in pressure in which the density and the diffusion anomalies are present. If the attractive forces are too strong, particle will be predominantly in one of the two length scales and no density of diffusion anomaly is observed. The structural anomalous region is present for all the cases.

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。

↑