Figure 1
(A) The applied high-intensity ultrasound generated an acoustic fountain, when a polymer droplet was placed on a 0.2-mm thick mylar membrane (acoustically conducting, but electrically isolating), while focusing the beam through water at the polymer-air interface. When the polymer was charged using an electrode (from −5 kV to −15 kV) and an electrically grounded target was placed above the fountain, a liquid jet was observed at the top of the ultrasonic fountain. (B) The method described in (A) was developed into a USES system, which was employed for systematic investigation of ultrasonic fiber-topography control using an −11.3 kV electrode voltage and 15 cm polymer to target distance.
