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. Author manuscript; available in PMC: 2020 Aug 1.
Published in final edited form as: Colloids Surf B Biointerfaces. 2019 May 3;180:371–375. doi: 10.1016/j.colsurfb.2019.05.001

Figure 1.

Figure 1

Oxygen-inhibited photopolymerization of droplets containing Acryl-PEG-biotin produces functional hydrogels with surfactant-free surfaces. A. Schematic illustration of hydrogel microparticle fabrication via oxygen-inhibited photopolymerization. B. Micrographs illustrating the process described in A, with NA-Rh fluorescence imaging showing the presence of a radial crosslinking density gradient in the hydrogel network. Droplet content: 30 wt% PEGDA 700, 0.5 wt% LAP, 0.5 wt% Acryl-PEG-Biotin, exposed for 700 ms, 350 µW/cm2.