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 +6 more
TLDR
This Letter reports the measurement of electro-osmotic flows (EOF) in microchannels with surface charge patterned on the 200 microm scale, which agree well with theory in the limit of thin double layers and low surface potential.Abstract:
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.read more
Citations
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Microfluidics: Fluid physics at the nanoliter scale
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TL;DR: A review of the physics of small volumes (nanoliters) of fluids is presented, as parametrized by a series of dimensionless numbers expressing the relative importance of various physical phenomena as mentioned in this paper.
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Flexible Methods for Microfluidics
TL;DR: In this article, the authors present new fabrication challenges and finding new applications in biology, chemistry, and materials science for handling nanoliter quantities of fluids, which is a new fabrication challenge.
References
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