The effect of reservoir liquid volume on dispensed droplet size in a microchannel using the EWOD technique

The present experimental study investigates the effect of thereservoir liquid volume on the dispensed droplet size in amicrochannel based on electrowetting on dielectric(EWOD) technique. A crescent configuration is fabricatedfor the channel electrodes which provides a largeroverlapping area. This leads to a higher electrowetting forcebetween the adjacent electrodes which improves the dropletmovement. In addition, special featured reservoir electrodesare patterned to facilitate the droplet dispensing. In order toexamine the effect of the reservoir liquid volume on thedispensed droplet size, several experiments are performed.The dispensed droplets obtained in the experiments are inthe range of 80-370 Nano litter. The channel dimensions,the size of the reservoir electrodes and the channelelectrodes are fixed. Increasing the reservoir liquid volumeleads to a smaller dispensed droplet.