GENERATING AND DISPENSING CHARGED MICRODROPLETS USING ELECTROHYDRODYNAMIC REPULSION FOR CIRCULAR DROPLET PATTERNING

摘要

This paper reports a novel method to form a circular pattern of monodisperse microdroplets using electrohydrodynamic repulsion (EDR) mechanism. EDR is a phenomenon of electrostatical bounced microdroplets from an accumulated droplet on a bottom substrate. In addition to regular EDR system, by placing a ring electrode between capillary and ground substrate, two separate regions were created. Parameter study of two regions was carried for droplet formation and falling velocity to control the radius of the generated droplets and the circular patterns independently.