Extended Data Fig. 1: Scanning droplet adhesion microscopy.
a, Droplet adhesion force curve recorded during scanning droplet adhesion microscopy31 sampling of the superhydrophobic surface. Before making contact with the surface, the droplet is freely suspended from the disc (I). After contact is established, the force begins to increase steeply, indicating that the droplet is being pushed against the surface (II). After the peak force, the stage is retracted; the force becomes negative as the liquid meniscus is elongated (III). Ultimately, the droplet detaches from the test surface, which induces a brief period of oscillations (IV). The pull-off force is defined as the difference between the baseline force after detachment and the global minimum of the curve (V). b, Pull-off forces for water drops on superhydrophobic surfaces, before and after abrasion, as a function of f micro. Pull-off forces were recorded from an area of 2.0 mm × 2.0 mm, with 500-μm spacing between each measurement point. Data are mean ± s.d. from 25 independent measurements.
