Fig. 4From: Preparation of alginate hydrogel microparticles by gelation introducing cross-linkers using droplet-based microfluidics: a review of methodsThree break-off mechanisms of droplet generation with a cross-flowing geometry: a squeezing, b dripping and c jetting. The arrow indicates the droplet flow direction. Figure reprinted with permission from Reference [57]. Copyright 2010 American Chemical SocietyBack to article page