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

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.

Experimental and theoretical research on oscillation behavior of droplets on horizontally oscillating substrates

“…Moreover, we improved the measurement method using an electric tweezer system to increase the practical performance by removing the metal needle set above the droplet, which was necessary to excite the deformation of the droplet with Maxwell stress. 18) The droplet was oscillated by the mechanical motion of the substrate, which oscillated vertically in the previous study. The behavior of a droplet on a vertically oscillating substrate can also be roughly explained by the theory of a free-sphere droplet.…”

Electromagnetically spinning viscometer designed for measurement of low viscosity in low shear rate region

“…[5][6][7][8][9][10][11] Besides the bio and medical fields, low viscosity liquids are promising material in advanced micro fluid technologies such as inkjet and micro-fluidics. [12][13][14][15][16][17][18][19] In this paper, we propose a new application of an EMS viscosity measurement system to extend the measurement range to a lower shear rate for low-viscosity samples. We briefly introduce the principles and various types of EMS.…”