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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