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Osmotic Propulsion: The Osmotic Motor

Córdova-Figueroa, Ubaldo M. and Brady, John F. (2008) Osmotic Propulsion: The Osmotic Motor. Physical Review Letters, 100 (15). Art. No. 158303. ISSN 0031-9007. doi:10.1103/PhysRevLett.100.158303.

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A model for self-propulsion of a colloidal particle—the osmotic motor—immersed in a dispersion of “bath” particles is presented. The nonequilibrium concentration of bath particles induced by a surface chemical reaction creates an osmotic pressure imbalance on the motor causing it to move. The ratio of the speed of reaction to that of diffusion governs the bath particle distribution which is employed to calculate the driving force on the motor, and from which the self-induced osmotic velocity is determined. For slow reactions, the self-propulsion is proportional to the reaction velocity. When surface reaction dominates over diffusion the osmotic velocity cannot exceed the diffusive speed of the bath particles. Implications of these features for different bath particle volume fractions and motor sizes are discussed. Theoretical predictions are compared with Brownian dynamics simulations.

Item Type:Article
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Brady, John F.0000-0001-5817-9128
Additional Information:©2008 The American Physical Society. (Received 14 March 2007; published 17 April 2008)
Issue or Number:15
Record Number:CaltechAUTHORS:CORprl08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10246
Deposited By: Archive Administrator
Deposited On:18 Apr 2008
Last Modified:08 Nov 2021 21:06

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