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Advanced Materials

Directional Oil Sliding Surfaces with Hierarchical Anisotropic Groove Microstructures

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Abstract

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 (inline image = 72.1 mN/m) as well as mineral oil (inline image = 28 mN/m) and conventional photoresist.

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