Table 1. Hydrogel compositions and associated Young’s moduli.

Acrylamide (wt%)	Bis-acryl. (wt%)	PEGDA (wt%)	Modulus (kPa)
4	0.225	0.0	2.7 ± 0.3
5	0.225	0.0	6.1 ± 0.2
8	0.264	0.0	18.5 ± 0.7
20	0.47	0.0	65 ± 5.6
15	0.65	0.0	84 ± 1.1
20	0.7	0.0	103 ± 3.8
0	0	5	5.7 ± 0.3
0	0	20	102 ± 8.4