Composite drop formation in immiscible liquid during interfacial solute transfer

We observe formation of multicomponent drop in multiphase environment in nature, science and technology. An obvious phenomena for an ordinary person, and classic problem for researchers due to its rich dynamics and implications in broad range of applications. Here, we experimentally study composite drop formation at fixed, submerged position inside stagnant liquid (continuous) phase, where interfacial transfer of one of the drop components occurs simultaneously into continuous phase. We report novel transition in drop formation regime from axisymmetric drop – deformed drop – deformed, oscillating drop – dripping, with a change in composition of drop phase. Results were confirmed by conducting multiple side, top-view experiments. Shadowgraphy was used to visualize solute diffusion, helping us to better understand its implications on drop formation time and volume. We quantitatively measure real time variations in drop size by in-house developed image analysis method. We show that solute extraction can be intensified by controlling drop formation time in such systems away from equilibrium.