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Advanced Materials

Robust Airlike Superhydrophobic Surfaces

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Abstract

A two-tier nanostructure comprising a 20-nm-diameter “nanograss” on 100-nm-diameter nanopillars exhibits robust and near-perfect superhydrophobicity, that is, water contact angles close to 180° and sliding angles close to 0°. Although the solid fraction was very low (∼0.02%), this surface could support a drop of water under a pressure of 234 Pa.

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