Fig. 2

CS-AuNRs macroporous scaffolds. a The crosslinked hydrogel prior to lyophilization. b, c Rheological properties of the hydrogel. b Loss and the storage moduli plotted versus the angular frequency. c Complex viscosity plotted versus the angular frequency. d SEM image of the macroporous scaffold after freezing at -80 °C. e SEM image of the macroporous scaffold after freezing at - 196 °C. Scale bar = 200 µm. f Mean pore diameter of the lyophilized scaffolds. g Degradation of the scaffolds during incubation in collagenase solution at 37 °C