title: Anomalous diffusion of symmetric and asymmetric active colloids.
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 t;{3/2} behavior. At the longest time scales, an effective diffusion coefficient is found which has a nonmonotonic dependence on the size of the colloid.
authors.affiliation: Department of Physics, University of Sheffield, Sheffield S3 7RH, United Kingdom. r.golestanian@sheffield.ac.uk
authors.forename: Ramin
authors.initials: R
authors.lastname: Golestanian
mesh_terms: D000465:Algorithms; D003102:Colloids / Q000737:chemistry*; D004058:Diffusion; D007700:Kinetics; D008956:Models, Chemical; D009038:Motion; D013269:Stochastic Processes; D013501:Surface-Active Agents / Q000737:chemistry*; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
chemical_list: D003102:Colloids; D013501:Surface-Active Agents; D014867:Water