Rectification of Swimming Bacteria and Self Driven Particle Systems by Arrays of Asymmetric Barriers

Details Rectification of Swimming Bacteria and Self Driven Particle Systems by Arrays of Asymmetric Barriers Rectification of Swimming Bacteria and Self Driven Particle Systems by Arrays of Asymmetric Barriers

2007-08-22

arxiv.org/abs/0708.3096v2

Phys. Rev. Lett. 101, 018102 (2008)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 postscript figures. Version to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.018102

We show that the recent experimental observation of the rectification of swimming bacteria in a system with an array of asymmetric barriers occurs due to the ballistic component of the bacteria trajectories introduced by the bacterial "motor." Each bacteria selects a random direction for motion and then moves in this direction for a fixed period of time before randomly changing its orientation and moving in a new direction. In the limit where the bacteria undergo only Brownian motion, rectification by the barriers does not occur. We also examine the effects of steric interactions between the bacteria and observe a clogging effect upon increasing the bacteria density.

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