Skip to main content
. Author manuscript; available in PMC: 2018 Oct 11.
Published in final edited form as: Lab Chip. 2017 Oct 11;17(20):3474–3488. doi: 10.1039/c7lc00694b

Figure 1.

Figure 1

(A) Approach for 3D printing and degradation of alginate microstructures. (i) Precursor solutions consisting of alginate, cation salts and photoacid generators were selectively illuminated with 355 nm UV light, resulting in (ii) direct writing due to ionic crosslinking, which could undergo (iii) triggered degradation by using EDTA to chelate cations. (B) Schematic of stereolithography apparatus. (C) Photopolymerization mechanism based on UV excitation of photoacid generators to dissociate cationic salts. (D) Degradation mechanism using EDTA to chelate cations.