Magnetic field-guided directional rebound of a droplet on a superhydrophobic flexible needle surface

Abstract

A superhydrophobic flexible tilt angle controlled needle surface is fabricated by integrating the methods of soft-lithography and crystal growth. The results indicate that the tilt angle of the SFN could be controlled easily via the external magnetic field strength. Accordingly, for the first time, the stimuli-responsive rebound of droplets in a guided lateral direction can be achieved.