A purely topographical structure can be used for controlling liquid spreading on surfaces, as reported by Quan Zhou and co-workers on page 2275. The method exploits easy-to-fabricate undercut edges to confine micro- and macroscale droplets and to control surface-microfluidic flow. The edges exhibit close to 180° contact angles even for low surface tension liquids, leading to highly anisotropic wetting at large scale.
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