Fig. 2: Mechanism of droplet horizontal rebound.
a Schematic illustration of droplet retraction on the PW surface. b Measured impact and retraction force of z-direction F on the PW surface FPW and SHB surface FSHB. t = 0 is set when the droplet reaches its maximum spreading radius. c The force Fz in the vertical direction during the retraction process of the droplet on the PW surface and the SHB surface. Here, the force is expressed as \({F}_{{{{\rm{z}}}}}/\sin \bar{\beta }={\gamma L}_{{{{\rm{z}}}}}\) and plotted by data of \({\gamma L}_{{{{\rm{z}}}}}\). d The force Fx in the vertical direction during the retraction process of the droplet on the PW surface and the SHB surface. The “+” and “−” denote the force is to the right and left, respectively, as distinguished by different colors. Here, the force is expressed as \({F}_{{{{\rm{x}}}}}/\overline{(\cos {\beta }_{1}-\cos {\beta }_{2})}=\gamma {L}_{{{{\rm{x}}}}}\) and plotted by data of \(\gamma {L}_{{{{\rm{x}}}}}\).
