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arXiv 2007.11722cond-mat.softcond-mat.stat-mech
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粒度分布对多分散硬盘的影响

Effect of particle size distribution on polydisperse hard disks

Pablo Sampedro Ruiz, Ran Ni

摘要:

利用蒙特卡罗模拟,我们系统地研究了粒度分布对多分散硬盘相行为的影响。与常用的类高斯多分散硬盘[Commun. Phys. 2,70(2019)],我们发现具有对数正态分布和三角形分布的多分散硬盘系统的相位行为显着不同。在对数正态分布的多分散硬盘系统中,虽然相图与类高斯多分散硬盘的相图相似,但在沉降实验中不能观察到六方相或固相的重入熔化。对于三角形分布的多分散硬盘系统,其相行为与类高斯分布和对数正态分布有质的不同,并且由于三角形分布的特殊形状,我们不能达到任何真实多分散性大于0.06的系统。我们的研究结果表明,准确的粒度分布是首要的,在确定多分散硬盘的相行为,我们没有一个通用的相图为不同的多分散硬盘系统。

英文摘要:

Using Monte Carlo simulations, we systematically investigate the effect of particle size distribution on the phase behaviour of polydisperse hard disks. Compared with the commonly used Gaussian-like polydisperse hard disks [Commun. Phys. 2, 70 (2019)], we find that the phase behaviour of polydisperse hard-disk systems with lognormal and triangle distributions are significantly different. In polydisperse hard-disk systems of lognormal distributions, although the phase diagram appears similar to that of Gaussian-like polydisperse hard disks, the re-entrant melting of hexatic or solid phase can not be observed in sedimentation experiments. For polydisperse hard-disk systems of triangle distributions, the phase behaviour is qualitatively different from the Gaussian-like and lognormal distributions, and we can not reach any system of true polydispersity larger than 0.06, which is due to the special shape of the triangle distribution. Our results suggest that the exact particle size distribution is of primary importance in determining the phase behaviour of polydisperse hard disks, and we do not have a universal phase diagram for different polydisperse hard-disk systems.

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