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arXiv 2102.02838cond-mat.softcond-mat.other
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引力在过冷液体中的作用

The role of the attractive forces in a supercooled liquid

Søren Toxvaerd

摘要:

分子动力学模拟了Lennard-Jones粒子在不同吸引力范围的过冷液体中的结晶过程,结果表明,来自第一、第二和第三配位壳层的吸引力的引入增加了系统结晶的趋势。在过冷液体中的键序$Q_6$是不均匀分布的,对于过冷液体,具有相对高键序的颗粒簇,并且随着吸引力范围的增加,不均匀性的程度系统地增加。结晶开始出现在这样的集群,这共同解释了吸引力对结晶的影响。的均方位移和自扩散常数表现出相同的依赖性的吸引力的范围内的动态和显示,吸引力和力的范围起着重要的作用,键序,扩散和结晶。

英文摘要:

Molecular Dynamics simulations of crystallization in a supercooled liquid of Lennard-Jones particles with different range of attractions shows that the inclusion of the attractive forces from the first, second and third coordination shell increases the trend to crystallize systematic. The bond-order $Q_6$ in the supercooled liquid is heterogeneously distributed with clusters of particles with relative high bond-order for a supercooled liquid, and a systematic increase of the extent of heterogeneity with increasing range of attractions. The onset of crystallization appears in such a cluster, which together explains the attractive forces influence on crystallization. The mean square displacement and self-diffusion constant exhibit the same dependence on the range of attractions in the dynamics and shows, that the attractive forces and the range of the forces plays an important role for bond-ordering, diffusion and for crystallization.

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。

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