Adhesion Mechanism of Water Droplets on Hierarchically Rough Superhydrophobic Rose Petal Surface
Figure 2
Liquid film on the fresh rose petal surface. Air pockets remain under the water film in the gaps between the nubs of the surface (a). Top areas of the nubs are visible, but light reflection on the liquid-air interface hinders the view between the nubs. With the decreasing surface tension of the fluid, the air pockets get gradually filled by the liquid and also the valleys between the nubs become visible (b–h).
