Droplet height control by electrowetting-on-dielectric for selective contact fusion of droplets on facing substrates

摘要

Our study is based on the concept of contact-fusion of droplets between vertically opposing substrates. This paper presents control of droplet-height for selective contact-fusion of droplets. Droplet-height is, for the first time, controlled by using electro-wetting-on-dielectric (hereafter EWOD). The shape of droplet such as droplet-height can be changed by electric field. It is possible to select contact/non-contact between facing droplets by controlling droplet-height. We could succeed in generating the difference in droplet-height by electric filed control. Applying 100V to electrode for EWOD, the height-difference of 4μL droplet amounted to 176m, initial height was 1200μm. This paper reports concentration control of substance in a droplet by selective contact-fusion of droplets.