Controlled formation and coalescence of paramagnetic ionic liquid droplets under magnetic field in coaxial microfluidic devices

This article reports the scaling law of droplet formation of the paramagnetic ionic liquid (MIL) under magnetic field in a coaxial microfluidic device. Firstly, the effect of two phase flow rates and magnetic forces on the size of MIL droplet in a coaxial microfluidic device were studied systematically. Then, based on force analysis, a mathematical model for the prediction of the diameter of MIL droplets was developed. Furthermore, a novel method which can achieve in-situ formation and controlled coalescence of droplets was developed by using a designated magnetic field.