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Fluid Mixing for Low-Power ‘Digital Microfluidics’ Using Electroactive Molecular Monolayers

Maria Serena Maglione, Stefano Casalini, Stamatis Georgakopoulos, Marianna Barbalinardo, Vitaliy Parkula, Núria Crivillers, Concepció Rovira, Pierpaolo Greco, Marta Mas-Torrent. Small 2017, 1703344. https://doi.org/10.1002/smll.201703344

A switchable electrode, which relies on an indium-tin oxide conductive substrate coated with a self-assembled monolayer terminated with an anthraquinone group (AQ), is reported as an electrowetting system. AQ electrochemical features confer the capability of yielding a significant modulation of surface wettability as high as 26° when its redox state is switched. Hence, an array of planar electrodes for droplets actuation is fabricated and integrated in a microfluidic device to perform mixing and dispensing on sub-nanoliter scale. Vehiculation of cells across microfluidic compartments is made possible by taking full advantage of surface electrowetting in culture medium.

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