Geometric pumping in autophoretic channels

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • University of Cambridge
  • LadHyX, Ecole Polytechnique

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.

Details

Original languageEnglish
Pages (from-to)5804-5811
JournalSoft Matter
Volume11
Issue number29
Publication statusPublished - 7 May 2015