Diffusive dynamics of elongated particles in active colloidal suspensions of motile algae

被引:0
|
作者
Florian von Rüling
Francine Kolley
Alexey Eremin
机构
[1] Otto von Guericke University Magdeburg,Institute of Physics
[2] TU Dresden,Center for Advancing Electronics (cfaed)
来源
Colloid and Polymer Science | 2021年 / 299卷
关键词
Active matter; Microswimmers; Diffusion;
D O I
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学科分类号
摘要
Swimming microorganisms can influence the diffusion of passive particles. The effect of this swimmer-particle interaction depends on different properties, such as the hydrodynamic field of the swimmer and the relative sizes of microorganisms and particles. We investigated an enhancement of the diffusion of silica doublets in a suspension of microalgae Chlamydomonas reinhardtii in a flat capillary. Depending on the concentration of microswimmers, the translational and rotational diffusion constants increase by several orders of magnitude in the presence of the swimming algae. For low concentrations of algae, the doublets exhibit Brownian motion in a fluctuating flow field generated by multiple swimmers. One can observe strong, diffusive transport caused by occasional large displacements. At high swimmer concentration, the algae form dense clusters, where the rotational motion of the doublets shows a subdiffusive behaviour while the translational motion remains diffusive.
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页码:289 / 296
页数:7
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