  We reported an electro-hydrodynamic shooting phenomenon of liquid metal
stream. A small voltage direct current electric field would induce ejection of
liquid metal inside capillary tube and then shooting into sodium hydroxide
solution to form discrete droplets. The shooting velocity has positive
relationship with the applied voltage while the droplet size is dominated by
the aperture diameter of the capillary nozzle. Further, the motion of the
liquid metal droplets can be flexibly manipulated by the electrodes. This
effect suggests an easy going way to generate metal droplets in large quantity,
which is important from both fundamental and practical aspects.
