Beetle Back Effect: Heterogeneous Wetting Micro- and Nanostructure Patterns
Figure 4.1 The water-capturing surface of the fused overwings (elytra) of the desert beetle Stenocara sp. The efficiency of this water collecting system is determined by the efficiency of those three steps. If there is more fog water droplets extracted to the solid surface and transported away in unit time, of course the high efficiency is realized. So, the growing water droplets
roll away from hydrophilic regions timely, a new circle of collecting would begin immediately. As described above, because the bumps can capture fog water droplets efficiently with its hydrophilic top, and the valleys can deliver the growing droplets quickly, the desert beetle’s back indicates a very efficient water-collecting ability.