Figure 1
Fluid domain design with prescribed boundary and initial conditions: (a) side view and (b) iso view. (c) Key dimensions for doubly re-entrant pillars. (d) SEM image of the fabricated doubly re-entrant pillars, with D = 100 µm, H = 100 µm, S = 200 µm, to = 10 µm and δ = 10 µm. (e) Cross-sectional image of the doubly re-entrant pillar. (f) Schematic illustration of the droplet impact process, where Pd is the total droplet impact pressure (Pa), Fc and Pc are the capillary force (N) and pressure (Pa) (see Supplementary Information, Sect. 5 for more details), Pair is the air pressure within the air-layer (Pa), λmax and λwetting are the maximum spreading diameter and wetting diameter of the droplet (m).
