Abstract Submission Template

We introduce a droplet-jumping phenomenon on a superhydrophobic surface driven by the resonant AC electrowetting. The resonant electrical actuation enables a droplet to accumulate sufficient surface energy for jumping, and superhydrophobic surface minimizes adhesion and hysteresis effects. They provide the effective energy conversion from the surface energy to the kinetic energy and improve the stability and the reproducibility of the droplet jumping. The controlled droplet jumping made by the resonant AC electrowetting could place another milestone in digital microfluidics by establishing a potential way to realize the threedimensional droplet manipulation based on the conventional single plate EWOD configurations. This abstract is related to a fluid dynamics video for the gallery of fluid motion 2009. Digital microfluidics based on the droplet manipulation by the electrowetting [1] enables microfluidic biochemical processes to be performed in an isolated droplet. The scalable and reconfigurable droplet manipulation of digital microfluidics, however, is primarily limited in two-dimensions. The increasing demand for the three-dimensional (3D) configuration in microfluidics can be also applicable to the digital microfluidics to broaden the scope of applications through 3D manipulation of droplets. In addition, the 3D droplet manipulation could also provide solutions to the difficult problems in current planar digital microfluidics such as the cross-contamination by solute adsorption and the degradation of electrodes [2]. Although there are a few