Robust superomniphobic surfaces with mushroom-like micropillar arrays

We present a simple method for the fabrication of robust superomniphobic surfaces with high transmittance (>90%) and durability (<6 months). The method consists of direct micromolding of mushroom-like micropillars and C ₄F₈ gas surface treatment. Such re-entrant structures were found to be highly resistant against wetting by various liquids and oils with a wide range of surface tensions from 22.3 (ethanol) to 72.1 mN m^-1 (water). Optimal structural parameters were derived based on the measurements of static contact angle and contact angle hysteresis.