Patterning Electro-osmotic Flow with Patterned Surface Charge

Abraham D. Stroock, Marcus Weck, Daniel T. Chiu, Wilhelm T.S. Huck, Paul J.A. Kenis, Rustem F. Ismagilov, George M. Whitesides

Research output: Contribution to journalArticlepeer-review


This Letter reports the measurement of electro-osmotic flows (EOF) in microchannels with surface charge patterned on the 200 μm scale. We have investigated two classes of patterns: (1) Those in which the surface charge varies along a direction perpendicular to the electric field used to drive the EOF; this type of pattern generates multidirectional flow along the direction of the field. (2) Those in which the surface charge pattern varies parallel to the field; this pattern generates recirculating cellular flow, and thus causes motion both parallel and perpendicular to the external field. Measurements of both of these flows agree well with theory in the limit of thin double layers and low surface potential.

Original languageEnglish (US)
Pages (from-to)3314-3317
Number of pages4
JournalPhysical Review Letters
Issue number15
StatePublished - Apr 10 2000

ASJC Scopus subject areas

  • General Physics and Astronomy


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