论文标题
运动藻类活性胶体悬浮液中细长颗粒的扩散动力学
Diffusive dynamics of elongated particles in active colloidal suspensions of motile algae
论文作者
论文摘要
游泳微生物会影响被动颗粒的扩散。这种游泳器粒子相互作用的效果取决于不同的特性，例如游泳者的流体动力场以及微生物和颗粒的相对大小。我们研究了在平坦毛细管中微藻衣原体中悬挂二氧化硅双重孔扩散的增强。根据Microswimmers的浓度，在游泳藻类的存在下，平移和旋转扩散常数增加了几个数量级。对于低浓度的藻类，双重藻类在多个游泳者产生的波动流场中表现出Brownian运动。人们可以观察到偶尔出现大型位移引起的强，扩散的运输。在高游泳者的浓度下，藻类形成致密的簇，在该簇中，双重运动表的旋转运动显示出宽大的行为，而翻译运动仍然扩散。
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.
