Decorating a surface with a forest of microposts can either make it repel water or cause it to be sucked into the spaces between posts. In the latter case, the shape of a liquid on the surface can be controlled using simple design principles.
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McHale, G. Liquids shape up nicely. Nature Mater 6, 627–628 (2007). https://doi.org/10.1038/nmat1988
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DOI: https://doi.org/10.1038/nmat1988
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