Li Guanglai, Tang Jay X
Physics Department, Brown University, Providence, Rhode Island 02912, USA.
Phys Rev Lett. 2009 Aug 14;103(7):078101. doi: 10.1103/PhysRevLett.103.078101. Epub 2009 Aug 12.
In this Letter we propose a kinematic model to explain how collisions with a surface and rotational Brownian motion give rise to accumulation of microswimmers 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.
在本信函中，我们提出了一个运动学模型，以解释与表面的碰撞以及旋转布朗运动如何导致微游动体在表面附近聚集。在该模型中，细长的微游动体从倾斜角度撞击表面后，总是平行于表面行进。然后，在旋转布朗运动的推动下，它游离表面。基于此模型的模拟再现了针对小细菌大肠杆菌和新月柄杆菌，以及在两壁之间游动的大得多的公牛精子所测得的密度分布。
