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Size dependence of the propulsion velocity for catalytic Janus-sphere swimmers

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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

Ebbens, S., Tu, M. H., Howse, J. R., & Golestanian, R. (2012). Size dependence of the propulsion velocity for catalytic Janus-sphere swimmers. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 85(2): 020401(R). doi:10.1103/PhysRevE.85.020401.


Cite as: http://hdl.handle.net/21.11116/0000-0001-7875-5
Abstract
The propulsion velocity of active colloids that asymmetrically catalyze a chemical reaction is probed experimentally as a function of their sizes. It is found that over the experimentally accessible range, the velocity decays as a function of size, with a rate that is compatible with an inverse size dependence. A diffusion-reaction model for the concentrations of the fuel and waste molecules that takes into account a two-step process for the asymmetric catalytic activity on the surface of the colloid is shown to predict a similar behavior for colloids at the large size limit, with a saturation for smaller sizes. © 2012 American Physical Society.