A robust directional oil sliding surface is presented by utilizing re-entrant micro-groove arrays inspired from the microgrooves of rice leaf. The overhang micro-groove arrays are shown to provide two primary goals of “omniphobicty” and “anisotropic sliding” with DI water ( = 72.1 mN/m) as well as mineral oil ( = 28 mN/m) and conventional photoresist.
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