Fig. 2: Bouncing dynamics of droplets.
From: Suppression of hollow droplet rebound on super-repellent surfaces
a Schematic (left) and picture (right) showing the HD spreading to its maximum radius Rmax, with the lamella height h0, bubble radius Rb-max, and contact radius Rcontact. b The plot of Rcontact as a function of time when the SD and HD impact a superhydrophobic surface. The retraction velocity of the HD is higher than that of the SD during droplet receding. c–e Comparison of the theoretical prediction with the experimental value of the spreading factor β (c), retraction velocity Vret (d), and restitution coefficient ε (e) for HD. In (b)–(e), the data was measured from experiments of droplets impacting superhydrophobic surfaces when We < 10 and superamphiphobic surfaces when We > 10, where the liquid surface tension was 53 and 35 mN m−1, respectively. Scale bar, 1 mm.
