Microfluidic consecutive flow-focusing droplet generators

This article describes emulsification in a microfluidic double droplet generator (DDR) comprising two consecutive flow- focusing devices with locally modified surface chemistry. We generated W/ O/ W, O/ O/ W and O/ W/ O double emulsions with precisely controlled sizes and morphology of droplets. Secondly, by combining two mechanisms of droplet formation (the flow- focusing mechanism and the break up of liquid threads at T- junction) we produced multiple populations of droplets with varying size and/ or composition. These droplets were used as the structural units for the formation of complex dynamic lattices.