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Issue 29, 2015
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Geometric pumping in autophoretic channels

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Abstract

Many microfluidic devices use macroscopic pressure differentials to overcome viscous friction and generate flows in microchannels. In this work, we investigate how the chemical and geometric properties of the channel walls can drive a net flow by exploiting the autophoretic slip flows induced along active walls by local concentration gradients of a solute species. We show that chemical patterning of the wall is not required to generate and control a net flux within the channel, rather channel geometry alone is sufficient. Using numerical simulations, we determine how geometric characteristics of the wall influence channel flow rate, and confirm our results analytically in the asymptotic limit of lubrication theory.

Graphical abstract: Geometric pumping in autophoretic channels

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Article information


Submitted
26 Mar 2015
Accepted
07 May 2015
First published
07 May 2015

Soft Matter, 2015,11, 5804-5811
Article type
Paper
Author version available

Geometric pumping in autophoretic channels

S. Michelin, T. D. Montenegro-Johnson, G. De Canio, N. Lobato-Dauzier and E. Lauga, Soft Matter, 2015, 11, 5804
DOI: 10.1039/C5SM00718F

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