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. Author manuscript; available in PMC: 2017 Oct 26.
Published in final edited form as: Biomater Sci. 2016 Mar;4(3):400–404. doi: 10.1039/c5bm00542f

Figure 2.

Figure 2

Microsphere formation via a water-in-oil emulsion followed by UV crosslinking. Light microscopy images of microspheres formed using only the hydrophilic photoinitiator (PI) in the pre-polymer solution (a), with both the hydrophilic PI in the pre-polymer and hydrophobic PI in the oil phase (b), or only the hydrophobic PI in the oil phase (c), showing how the dual PI method results in the best micrsphere formation, without coalescence (black arrows) or debris (*). The addition of pluronic to the emulsion vastly reduced the size of the spheres formed and thus increased the usable yield.