Measurement of interfacial properties among fluids by micro-droplets observation

摘要

Shapes of 30 micron-droplets floating on liquid surface are observed. When a microdroplet ejected from an inkjet nozzle impinges on the immiscible liquid surface, we can observe the stable shape of the floating droplet after 200 mu s from the touchdown. We observed the shapes of the upper and lower sides of the droplet simultaneously with two microscopes and analyzed the profile of the droplet. Considering the line tension acting on the three-phase contact line, we succeeded in explaining the experimental shape of the floating microdroplet on the liquid surface.