Self-motile colloidal particles: from directed propulsion to random walk

Details Self-motile colloidal particles: from directed propulsion to random walk Self-motile colloidal particles: from directed propulsion to random walk

2007-06-29

arxiv.org/abs/0706.4406v1

Physics

Condensed Matter

Soft Condensed Matter

This is an experimental paper, due to appear in Phys. Rev. Lett. (2007)

Scientific paper

10.1103/PhysRevLett.99.048102

The motion of an artificial micro-scale swimmer that uses a chemical reaction catalyzed on its own surface to achieve autonomous propulsion is fully characterized experimentally. It is shown that at short times, it has a substantial component of directed motion, with a velocity that depends on the concentration of fuel molecules. At longer times, the motion reverts to a random walk with a substantially enhanced diffusion coefficient. Our results suggest strategies for designing artificial chemotactic systems.

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