Fig. 11From: Preparation of alginate hydrogel microparticles by gelation introducing cross-linkers using droplet-based microfluidics: a review of methodsa Schematic diagram of the preparation of Ca-alginate hydrogel microparticles by using CaCO3 to perform internal gelation of alginate in a PDMS-based microfluidic device. Micrograph of b droplets generated in the channel and c Ca-alginate hydrogel microparticles collected in oil. Figure reprinted with permission from Reference [61]Back to article page