Figure 3.

Dynamic wettability of the water droplet and the underwater oil droplet/bubble on the as-prepared surfaces. (a, e, f) Dispensing (a) a water droplet, (e) an oil droplet, and (f) an air bubble onto the resultant surface. (b, c, d) Processes of (b) an oil droplet, (c) an air bubble, and (d) a water droplet rolling off on the resultant surface. Substrates in (a–c) are the rough surfaces and those in (d–f) are the F-rough surfaces. The processes in (a, d) were performed in air, while the processes in (b, c, e, f) were performed in water.