Abstract
Surface adhesion is vital to the capability of precise manipulation of open droplets. However, it is still a great challenge to achieve efficient, large-scale, and cost-effective construction of highly adhesive surface for large-volume droplets manipulation. In this paper, a facile methodology for fabricating a superhydrophobic and highly adhesive polydimethylsiloxane (PDMS) surface is presented for multifunctional droplet transferring. The proposed features can be easily fabricated by PDMS replicating and vapor-phase silanization. The 1500-grit sandpaper was chosen as the optimal template, owing to its superior hydrophobic attributes with an approximate contact angle of 155.1°, a maximum adhesion volume of 38.6 μL, and a minimal residual volume of 0.124 μL. Remarkable stability was also validated with exposure to air for more than 9 weeks or to reagents with pH ranging from 1 to 13. Visually colorimetric detection of Cu2+ is successfully demonstrated on both single-droplet and droplet-array forms after a series of transporting, mixing, and reacting processes between different reagent droplets. The facile preparation and equipment-free platform highlights the potential application in point-of-care testing (POCT).
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