Fig. 3: The contact diameter recovery rate (CDRR), the contact angle recovery rate (CARR), contact angle, and sliding angle changes of droplets on the four hydrophobic surfaces after the icing & melting cycle.
From: Spontaneous dewetting transitions of droplets during icing & melting cycle
a and b CDRR and CARR of droplets on the four surfaces after icing and melting. c Comparison of the original contact angles (CA), contact angles after one cycle, and the contact angle differences on the four hydrophobic surfaces. d Comparison of the original sliding angles (SA), the sliding angles after one cycle and the sliding angle differences on the four hydrophobic surfaces. The CDRR (δr) and CARR (δa) represent the CB state recovery extents of droplets. They can be calculated by \({\delta }_{{{{{{\rm{r}}}}}}}=1-\frac{{D}_{{{{{{\rm{f}}}}}}}-{D}_{0}}{{D}_{0}}\) and \({\delta }_{a}=1-\frac{{\theta }_{0}-{\theta }_{{{{{{\rm{f}}}}}}}}{{\theta }_{0}}\), where Df and θf, D0 and θ0 denote the final contact diameter and contact angle after melting, the original contact diameter and angle, respectively. Schematics are inserted in a and b. The CA 150° boundary of superhydrophobicity is indicated with the black dashed line. Sliding angles of four surfaces after one cycle are marked. Data are mean ± s.d. from at least three independent measurements.
