Abstract
Water harvesting is a critical and very urgent problem for humanity. Inspired by the stenocara beetle, we demonstrate from first principles how heterogeneous wettability surfaces can optimize water collection by varying the area of hydrophilic patches on top of a hydrophobic surface. These theoretical considerations allow determination of the optimal combination of wettability patches for water collection. We have validated these developments with several experiments involving different patch sizes and support inclinations. This new method can be developed for drop storage in biotechnology, for instance, and drop transport applications such as water-harvesting systems.
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