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Issue 15, 2011
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Colloidal diffusion and hydrodynamic screening near boundaries

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Abstract

The hydrodynamic interactions between colloidal particles in small ensembles are measured at varying distances from a no-slip surface over a range of inter-particle separations. The diffusion tensor for motion parallel to the wall of each ensemble is calculated by analyzing thousands of particle trajectories generated by blinking holographic optical tweezers and by dynamic simulation. The Stokesian Dynamics simulations predict similar particle dynamics. By separating the dynamics into three classes of modes: self, relative and collective diffusion, we observe qualitatively different behavior depending on the relative magnitudes of the distance of the ensemble from the wall and the inter-particle separation. A simple picture of the pair-hydrodynamic interactions is developed, while many-body-hydrodynamic interactions give rise to more complicated behavior. The results demonstrate that the effect of many-body hydrodynamic interactions in the presence of a wall is much richer than the single particle behavior and that the multiple-particle behavior cannot be simply predicted by a superposition of pair interactions.

Graphical abstract: Colloidal diffusion and hydrodynamic screening near boundaries

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Article information


Submitted
10 Dec 2010
Accepted
05 May 2011
First published
20 Jun 2011

Soft Matter, 2011,7, 6844-6852
Article type
Paper

Colloidal diffusion and hydrodynamic screening near boundaries

P. P. Lele, J. W. Swan, J. F. Brady, N. J. Wagner and E. M. Furst, Soft Matter, 2011, 7, 6844
DOI: 10.1039/C0SM01466D

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