Abstract
This work outlines inexpensive patterning methodologies to create open-air microfluidic paper-based devices. A phase-separation methodology was used to obtain biomimetic superhydrophobic paper, hierarchically composed by micro and nano topographies. Writing and printing are simple actions that can be used to pattern flat superhydrophobic paper with more wettable channels. In particular, inkjet printing permits controlling the wettability of the surface by changing the darkness of the printed regions. The difference between capillary forces provides the possibility to control and drive liquid flows through the open path lines, just by titling the piece of paper. Additionally, maintaining a continuous flow, it is possible to direct the liquid at different volumetric rates in a horizontal position along non-linear channel paths printed/written over the surface.
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Sousa, M.P., Mano, J.F. Patterned superhydrophobic paper for microfluidic devices obtained by writing and printing. Cellulose 20, 2185–2190 (2013). https://doi.org/10.1007/s10570-013-9991-6
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DOI: https://doi.org/10.1007/s10570-013-9991-6