Fig. 9From: Preparation of alginate hydrogel microparticles by gelation introducing cross-linkers using droplet-based microfluidics: a review of methodsa Schematic diagram of Ca-alginate hydrogel microparticles prepared in a PMMA based microfluidic device. b Micrographs of Ca-alginate hydrogel microparticles. Figure reprinted with permission from Reference [54]Back to article page