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Colloidal diffusion and hydrodynamic screening near boundaries

Lele, Pushkar P. and Swan, James W. and Brady, John F. and Wagner, Norman J. and Furst, Eric M. (2011) Colloidal diffusion and hydrodynamic screening near boundaries. Soft Matter, 7 (15). pp. 6844-6852. ISSN 1744-683X.

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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.

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Brady, John F.0000-0001-5817-9128
Additional Information:© 2011 The Royal Society of Chemistry. Received 10th December 2010, Accepted 5th May 2011. First published on the web 20 Jun 2011. We thank A. N. Beris for helpful discussions. We acknowledge the financial support of the NSF (NIRT CBET-0506701).
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Issue or Number:15
Record Number:CaltechAUTHORS:20110808-093428080
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24723
Deposited By: Tony Diaz
Deposited On:06 Oct 2011 21:54
Last Modified:24 Feb 2020 10:30

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