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Brownian motion of ellipsoidal particles on a granular magnetic bath.
Physical Review E ( IF 2.2 ) Pub Date : 2020-08-03 , DOI: 10.1103/physreve.102.022902
C Tapia-Ignacio 1 , R E Moctezuma 2 , F Donado 1 , Eric R Weeks 3
Affiliation  

We study the Brownian motion of ellipsoidal particles lying on an agitated granular bath composed of magnetic particles. We quantify the mobility of different floating ellipsoidal particles using the mean-square displacement and the mean-square angular displacement, and relate the diffusion coefficients to the bath particle motion. In terms of the particle major radius R, we find the translational diffusion coefficient scales roughly as 1/R2 and the rotational diffusion coefficient scales as roughly 1/R4; this is consistent with the assumption that diffusion arises from random kicks of the bath particles underneath the floating particle. By varying the magnetic forcing, the bath particles' diffusivity changes by a factor of ten; over this range, the translational and rotational diffusion of the floating particles change by a factor of 50. However, the ratio of the two diffusion constants for the floating particles is forcing-independent. Unusual aspects of the floating particle motion include non-Gaussian statistics for their displacements.

中文翻译:

椭圆粒子在粒状磁浴上的布朗运动。

我们研究了椭圆形粒子在由磁性粒子组成的搅拌式颗粒浴上的布朗运动。我们使用均方位移和均方角位移来量化不同的漂浮椭圆形粒子的迁移率,并将扩散系数与浴粒子运动联系起来。在粒子长半径方面[R,我们发现平移扩散系数的比例大致为 1个/[R2 旋转扩散系数大致按比例缩放 1个/[R4; 这与这样的假设是一致的,即扩散是由漂浮粒子下面的浴粒子的随机踢引起的。通过改变磁力,镀液颗粒的扩散系数会变化十倍。在此范围内,漂浮颗粒的平移和旋转扩散变化50倍。但是,漂浮颗粒的两个扩散常数之比与强制无关。浮动粒子运动的不寻常方面包括位移的非高斯统计。
更新日期:2020-08-03
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