High speed measurement of liquid properties from behavior of micro droplets on vertically oscillating substrate

Abstract

Abstract In this study, we introduce a practical improvement to our experimental method to measure the mechanical properties of small liquid droplets by observing their oscillation on solid substrates. Instead of the electric tweezer system used in our previous study, the oscillation was applied by the mechanical motion of the substrate. Such instrument could be applied in the future use of inkjet which forms a droplet. In addition, an optical knife-edge method was employed to detect droplet deformation with high time resolution. We demonstrated the ability of the system to measure the adsorption of evaporated ethanol molecules on a water droplet.