Electroosmotic Flow Dipole: Experimental Observation and Flow Field Patterning

Federico Paratore, Evgeniy Boiko, Govind V. Kaigala, Moran Bercovici

Research output: Contribution to journalArticlepeer-review

Abstract

We experimentally demonstrate the phenomenon of electroosmotic dipole flow that occurs around a localized surface charge region under the application of an external electric field in a Hele-Shaw cell. We use localized deposition of polyelectrolytes to create well-controlled surface charge variations, and show that, for a disk-shaped spot, the internal pressure distribution that arises results in uniform flow within the spot and dipole flow around it. We further demonstrate the superposition of surface charge spots to create complex flow patterns, without the use of physical walls.

Original languageEnglish
Article number224502
JournalPhysical Review Letters
Volume122
Issue number22
DOIs
StatePublished - 7 Jun 2019

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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