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Anomalous diffusion of symmetric and asymmetric active colloids

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Golestanian,  Ramin
Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Golestanian, R. (2009). Anomalous diffusion of symmetric and asymmetric active colloids. Physical Review Letters, 102(18): 188305. doi:10.1103/PhysRevLett.102.188305.


Cite as: http://hdl.handle.net/21.11116/0000-0001-7905-2
Abstract
The stochastic dynamics of colloidal particles with surface activity-in the form of catalytic reaction or particle release-and self-phoretic effects are 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 superdiffusive t3/2 behavior. At the longest time scales, an effective diffusion coefficient is found which has a nonmonotonic dependence on the size of the colloid. © 2009 The American Physical Society.