Fig. 10From: Preparation of alginate hydrogel microparticles by gelation introducing cross-linkers using droplet-based microfluidics: a review of methodsa Schematic diagram of the PDMS-based microfluidic device. b Flow-focusing channel to generate alginate droplets. c Flow-focusing channel to generate CaCl2 droplets. d T-junction followed by a first circular expansion chamber. e A second circular expansion chamber. f Ca-alginate hydrogel microparticles of different shapes and sizes. Figure reprinted with permission from Reference [28]. Copyright 2006 American Chemical SocietyBack to article page