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arXiv 2002.01902cond-mat.soft
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稠密流体中斑片状粒子的转动和平动动力学

Rotational and translational dynamics in dense fluids of patchy particles

Susana Marín-Aguilar, Henricus H. Wensink, Giuseppe Foffi, Frank Smallenburg

摘要:

我们探讨了方向性对片状粒子的玻璃态系统中的转动和平移弛豫的影响。使用分子动力学模拟,我们分析了两个不同的补丁几何形状,一个,增强本地二十面体结构和一个不强烈影响当地秩序的影响。我们发现,在几乎所有的调查情况下,旋转松弛发生在一个更快的时间尺度比平移松弛。通过比较一个简化的动态蒙特卡罗模型,我们说明,旋转扩散可以定性地解释为纯粹的本地运动在一个固定的环境中,这是不强烈耦合到所需的平移松弛的破笼动力学。尽管如此,二十面体补丁的位置有深刻的影响,系统的局部结构,导致在低温下的显着放缓,这是最强的中间“最佳”补丁的大小。

英文摘要:

We explore the effect of directionality on rotational and translational relaxation in glassy systems of patchy particles. Using molecular dynamics simulations we analyze the impact of two distinct patch geometries, one that enhance local icosahedral structure and one which does not strongly affect local order. We find that in nearly all investigated cases, rotational relaxation takes place on a much faster time scale than translational relaxation. By comparing to a simplified dynamical Monte Carlo model, we illustrate that rotational diffusion can be qualitatively explained as purely local motion within a fixed environment, which is not coupled strongly to the cage-breaking dynamics required for translational relaxation. Nonetheless, icosahedral patch placement has a profound effect on the local structure of the system, resulting in a dramatic slowdown at low temperatures which is strongest at an intermediate "optimal" patch size.

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