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Patterning electro-osmotic flow with patterned surface charge

Stroock, Abraham D. and Weck, Marcus and Chiu, Daniel T. and Huck, Wilhelm T. S. and Kenis, Paul J. A. and Ismagilov, Rustem F. and Whitesides, George M. (2000) Patterning electro-osmotic flow with patterned surface charge. Physical Review Letters, 84 (15). pp. 3314-3317. ISSN 0031-9007.

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This Letter reports the measurement of electro-osmotic flows (EOF) in microchannels with surface charge patterned on the 200 mu m 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 flew, and thus causes motion both parallel and perpendicular to the external field. Measurements of both of these flours agree well with theory in the Limit of thin double layers and low surface potential.

Item Type:Article
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URLURL TypeDescription
Ismagilov, Rustem F.0000-0002-3680-4399
Whitesides, George M.0000-0001-9451-2442
Additional Information:© 2000 The American Physical Society. Received 2 November 1999; published in the issue dated 10 April 2000. We are grateful to Professor A. Ajdari (Ecole Supérieure de Physique et Chimie Industrielles de Paris) and Professor H. Stone (DEAS, Harvard University) for helpful discussions. This work was supported by DARPA: NSF ECS-9729405, NIH: GM51559, and NSF: DMR-9809363 MRSEC. A. D. S. was supported by NIH Molecular Biophysics Training Grant No. 5T32GM08313-10. M. W. was supported by the German Academic Exchange Service (DAAD). P. J. A. K. was supported by Netherlands Organization for Scientific Research (NWO).
Funding AgencyGrant Number
German Academic Exchange Service (DAAD)UNSPECIFIED
Netherlands Organization for Scientific Research (NWO)UNSPECIFIED
Subject Keywords:elctroosmosis; particles
Issue or Number:15
Record Number:CaltechAUTHORS:20130821-160733045
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:40876
Deposited By: Whitney Barlow
Deposited On:28 Aug 2013 22:25
Last Modified:09 Mar 2020 13:19

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