Accumulation of Microswimmers due to Their Collisions with a Surface

Details Accumulation of Microswimmers due to Their Collisions with a Surface Accumulation of Microswimmers due to Their Collisions with a Surface

2008-12-22

arxiv.org/abs/0812.4258v1

Physics

Biological Physics

4 pages

Scientific paper

In this letter we propose a kinematic model to show how collisions with a surface and rotational Brownian motion give rise to the accumulation of micro-swimmers near a surface. In this model, an elongated microswimmer invariably travels parallel to the surface after hitting it from any incident angle. It then swims away from the surface after some time, 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 in confinement.

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