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- W2159832082 abstract "Lateral-flow immunosensing devices continue to be the most successful commercial realization of analytical microdevices. They owe their success to their simplicity, which significantly depends on the capillary-driven flow and versatile technological platform that lends itself to fast and low-cost product development. To compete with such a convenient product, microsystems can benefit from simple-to-operate fluid manipulation. We show that the capillary-driven flow in microchannels can be manipulated with electrochemically activated valves with no moving parts. These valves consist of screen-printed electrode pairs that are transversal to the flow. One of the electrodes is solvent-etched to produce a superhydrophobic surface that provides passive stopping and facilitates low-voltage (~1 V) actuation of the flow via electrowetting. The operation of such valves in the stop-go mode, with a response time between 2 and 45 sec depending on the type and concentration of salt, is demonstrated. Mechanistic investigations indicated that the response depends on at least three phenomena that contribute to electrocapillarity: the electrochemical double-layer capacitance, specific counterion adsorption, and possible electrohydrodynamic effects." @default.
- W2159832082 created "2016-06-24" @default.
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- W2159832082 date "2013-04-16" @default.
- W2159832082 modified "2023-10-16" @default.
- W2159832082 title "Eletrochemically Actuated Stop-Go Valves for Capillary Force-Operated Diagnostic Microsystems" @default.
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- W2159832082 doi "https://doi.org/10.1002/cphc.201300042" @default.
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