19 February 2018 Toward microscale flow control using non-uniform electro-osmotic flow
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We present a novel method that allows establishing desired flow patterns in a Hele-Shaw cell, solely by controlling the surface chemistry, without the use of physical walls. Using weak electrolytes, we locally pattern the chamber's ceiling and/or floor, thus defining a spatial distribution of surface charge. This translates to a non-uniform electric double layer which when subjected to an external electric field applied along the chamber, gives rise to non-uniform electroosmotic flow (EOF). We present the theory that allows prediction and design of such flows fields, as well as experimental demonstrations opening the door to configurable microfluidic devices.
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Federico Paratore, Federico Paratore, Evgeniy Boyko, Evgeniy Boyko, Amir D. Gat, Amir D. Gat, Govind V. Kaigala, Govind V. Kaigala, Moran Bercovici, Moran Bercovici, } "Toward microscale flow control using non-uniform electro-osmotic flow ", Proc. SPIE 10491, Microfluidics, BioMEMS, and Medical Microsystems XVI, 104910P (19 February 2018); doi: 10.1117/12.2300963; https://doi.org/10.1117/12.2300963


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