The apparent contact angle was measured by a contact angle system (Attention, KSV instruments). Test liquids were water, ethylene glycol, and ethanol. Droplets were deposited on a fabricated surface by a micropipette. The volume of droplets was 6 μl for all cases. Samples were hierarchical systems with disk-, overhang-, and serif-T–shaped nanostructures. The apparent contact angle was automatically decided by a computer program (OneAttention).

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