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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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Publication details

The article was received on 26 Mar 2015, accepted on 07 May 2015 and first published on 07 May 2015


Article type: Paper
DOI: 10.1039/C5SM00718F
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Citation: Soft Matter, 2015,11, 5804-5811
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    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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