Fig. 12From: Preparation of alginate hydrogel microparticles by gelation introducing cross-linkers using droplet-based microfluidics: a review of methodsa Schematic diagram of a PDMS-based microfluidic device for the generation of droplets. b Micrograph of the two cross-junctions in the microfluidic device. c Confocal microscopic image of Ca-alginate hydrogel microparticles, some with cells encapsulated (Green fluorescence represents live cells stained by calcein AM). Figure reprinted with permission from Reference [3]Back to article page