Anomalous Diffusion of Symmetric and Asymmetric Active Colloids

Details Anomalous Diffusion of Symmetric and Asymmetric Active Colloids Anomalous Diffusion of Symmetric and Asymmetric Active Colloids

2009-04-20

arxiv.org/abs/0904.3044v1

Phys. Rev. Lett. 102, 188305 (2009)

Physics

Condensed Matter

Soft Condensed Matter

4 pages. To appear in Physical Review Letters

Scientific paper

The stochastic dynamics of colloidal particles with surface activity--in the form of catalytic reaction or particle release--and self-phoretic effects is studied analytically. Three different time scales corresponding to inertial effects, solute redistribution, and rotational diffusion are identified and shown to lead to a plethora of different regimes involving inertial, propulsive, anomalous, and diffusive behaviors. For symmetric active colloids, a regime is found where the mean-squared displacement has a super-diffusive $t^{3/2}$ behavior. At the longest time scales, an effective diffusion coefficient is found which has a non-monotonic dependence on the size of the colloid.

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