Accumulation of microswimmers near a surface mediated by collision and rotational Brownian motion.
Accumulation of microswimmers near a surface mediated by collision and rotational Brownian motion.
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DOI：
10.1103/physrevlett.103.078101
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发表时间：
2009-08-14
影响因子：
8.6
通讯作者：
Tang JX
中科院分区：
文献类型：
--
作者：
Li G;Tang JX
在这封信中，我们提出了一个运动学模型来解释与表面的碰撞和旋转布朗运动是如何导致微型游泳者在表面附近聚集的。在这个模型中，细长的微泳者从倾斜的角度击中水面后，总是平行于水面移动。然后，在旋转布朗运动的推动下，它游出了海面。基于这一模型的模拟再现了小细菌大肠杆菌和新月弯杆菌的密度分布，以及在两面墙之间游泳的更大的公牛精子的密度分布。
In this letter we propose a kinematic model to explain how collisions with a surface and rotational Brownian motion give rise to accumulation of micro-swimmers near a surface. In this model, an elongated microswimmer invariably travels parallel to the surface after hitting it from an oblique angle. It then swims away from the surface, facilitated by rotational Brownian motion. Simulations based on this model reproduce the density distributions measured for the small bacteria E. coli and Caulobacter crescentus, as well as for the much larger bull spermatozoa swimming between two walls.