Dynamics of polydisperse hard-spheres under strong confinement

Dynamics of polydisperse hard-spheres under strong confinement
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强约束下多分散硬球的动力学

DOI:
10.1080/00268976.2020.1728407
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发表时间:
2020
期刊:
影响因子:
1.7
通讯作者:
Conrad, Jacinta C.
Conrad, Jacinta C.
中科院分区:
化学4区
文献类型:
--
作者:
Roberts, Ryan C.;Marioni, Nico;Palmer, Jeremy C.;Conrad, Jacinta C.

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我们使用分子模拟来探索局域结构与观察到的受限于狭缝孔中的多分散硬球液体的异常折返动力学之间的联系。局部结构的特征是通过计算与邻近围墙的层中颗粒的正方形和六边形有序相关的二维键取向有序参数来表征的。当壁面间距与平均颗粒尺寸成正比时,颗粒主要表现为局部六方有序性,而无公度几何结构的局部平方有序性增加。从系综平均的均方位移中提取的驰豫时间随着与强受限公度几何中的六次局域有序相关的静态关联长度指数地增加,这与动力学减慢的理论预测一致。相比之下,无论是公度几何还是非公度几何,平方顺序都与不断增长的长度尺度无关,这表明它在几何上是强烈受挫的。我们的结果表明,可以通过改变限制程度来改变键取向顺序对动力学慢化的影响。
We use molecular simulation to probe the connection between local structure and the unusual re-entrant dynamics observed for polydisperse hard-sphere liquids confined in thin slit pores. The local structure is characterised by calculating 2-D bond-orientational order parameters associated with square and hexatic order for particles in the layer adjacent to the confining walls. When the wall separation is commensurate with the average particle size, the particles primarily exhibit local hexatic order, whereas local square order increases in prevalence for incommensurate geometries. The relaxation time extracted from the ensemble-averaged mean-square displacement increases exponentially with the static correlation length associated with hexatic local order in strongly confined commensurate geometries, in agreement with theoretical predictions for dynamical slowing. Square order, by contrast, is not associated with a growing length scale for either commensurate or incommensurate geometries, indicating that it is strongly geometrically frustrated. Our results suggest that the influence of bond-orientational order on dynamical slowing may be altered by changing the extent of confinement.
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