Sedimentation of a suspension of paramagnetic particles in an external magnetic field.,Physical Review E

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Sedimentation of a suspension of paramagnetic particles in an external magnetic field.
Physical Review E ( IF 2.2 ) Pub Date : 2020-08-03 , DOI: 10.1103/physreve.102.023101
Jérémy Vessaire ₁ , Nicolas Plihon ₁ , Romain Volk ₁ , Mickaël Bourgoin ₁

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We investigate the sedimentation of initially packed paramagnetic particles in the presence of a homogeneous external magnetic field, in a Hele-Shaw cell filled with water. Although the magnetic susceptibility of the particles is small and the particle-particle-induced magnetic interactions are significantly smaller compared to the gravitational acceleration, we do observe a measurable reduction of the decompaction rate as the amplitude of the applied magnetic field is increased. While induced magnetic dipole-dipole interactions between particles can be either attractive or repulsive depending on the particles relative alignment, our observations reveal an effective overall enhancement of the cohesion of the initial pack of particles due to the induced interactions, very likely promoting internal chain forces in the initial pack of particles. The influence of the magnetic field on the particles once they disperse after being decompacted is, however, found to remain marginal.

中文翻译：

在外部磁场中沉淀出顺磁性颗粒的悬浮液。

我们研究了在充满水的Hele-Shaw电池中，在均匀的外部磁场存在下，最初填充的顺磁粒子的沉降。尽管与重力加速度相比，粒子的磁化率小，并且粒子与粒子的磁相互作用显着较小，但我们确实观察到随着施加磁场幅度的增加，可测得的失压缩率降低了。尽管粒子之间的感应磁偶极-偶极相互作用可能是吸引性的也可能是排斥性的，具体取决于粒子的相对排列，但我们的观察表明，由于感应的相互作用，有效地整体增强了初始粒子组的内聚力，很可能会促进内部链力在最初的粒子包中。

更新日期：2020-08-03

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