Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published June 6, 2013 | Published
Journal Article Open

Osmotic propulsion of colloidal particles via constant surface flux

Abstract

We propose a model for the self-propulsion of a small motor particle that generates a nonuniform concentration distribution of solute in the surrounding fluid via a constant solute flux asymmetrically from the motor surface. The net osmotic driving force and motor speed are investigated in the limits of slow and fast product particle flux (relative to the diffusive flux of the product species). When the only solute species in solution is that produced by the motor, the motor's speed is shown to be proportional to the solute flux for slow flux rates and to the square root of the solute flux for large flux rates. When solute species are already present in solution at concentration high compared to that generated by the motor, the motor speed at high flux rates saturates and scales as the diffusivity of the solute divided by the motor size. The analytical results compare well with Brownian dynamics simulations. Full hydrodynamic interactions are taken into account in the theoretical analysis.

Additional Information

© 2013 The Royal Society of Chemistry. Received 02 Jan 2013, Accepted 22 May 2013. First published online 06 Jun 2013.

Attached Files

Published - c3sm00017f.pdf

Files

c3sm00017f.pdf
Files (1.2 MB)
Name Size Download all
md5:5705ce02789438c4c77f057e7c1319dd
1.2 MB Preview Download

Additional details

Created:
August 19, 2023
Modified:
October 24, 2023