Bouncing behaviors of suspension liquid drops on a superhydrophobic surface

This paper reveals three patterns of bouncing behaviors of suspension drops containing calcium carbonate (CaCO(3)) powder on a superhydrophobic surface with the aid of a high-speed camera. In transmission electron microscopy (TEM) observation, the particles of CaCO(3) are shaped like sticks whose equivalent diameters are about 700 nm. Unlike a pure water drop, dense suspension drops cannot be pinched off at the bounce on the superhydrophobic surface due to a high effective viscosity, whereas the equilibrium contact angle appears to be almost identical in all kinds of droplets.