Geometric pumping in autophoretic channels.
Change log
Authors
Michelin, Sébastien
Montenegro-Johnson, Thomas D
De Canio, Gabriele
Lobato-Dauzier, Nicolas
Lauga, Eric https://orcid.org/0000-0002-8916-2545
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.
Description
Keywords
Microfluidic Analytical Techniques, Solutions, Viscosity
Journal Title
Soft Matter
Conference Name
Journal ISSN
1744-683X
1744-6848
1744-6848
Volume Title
11
Publisher
Royal Society of Chemistry (RSC)
Publisher DOI
Sponsorship
SM acknowledges the support of the French Ministry of Defense
(DGA). TDMJ is supported by a Royal Commission for
the Exhibition of 1851 Research Fellowship. GDC acknowledges
support from Associazione Residenti Torrescalla. This
work was funded in part by a European Union Marie Curie
CIG Grant to EL.