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. Author manuscript; available in PMC: 2015 Mar 12.
Published in final edited form as: Adv Mater. 2013 Dec 12;26(10):1494–1533. doi: 10.1002/adma.201304431

Figure 5. Modulation of substrate mechanics by hydrogel cross-linking.

Figure 5

(a) Schematic of the dependence of hydrogel stiffness on the fraction of crosslinkers. (b) Schematic of gelation and photo-assisted stiffening of a methacrylated hyaluronic acid (MeHA) gel, wherein the gelation was achieved by addition reaction and the stiffening was introduced via UV-initiated radical polymerization.[130] Reproduced with permission from [130]. Copyright 2012, Nature Publishing Group. (c) Schematic of photo-assisted softening of a PEG-based gel made of crosslinking units with photo-degradable backbones.[133] Reproduced with permission from [133]. Copyright 2010, Nature Publishing Group.