Fig. 3. SEM images of the hydrogel micromorphologies: (a) SA2 hydrogel, (b) SA3 hydrogel, (c) SA4 hydrogel, (d) SA5 hydrogel, (e) GA hydrogel, (f) GA/SA2 DN hydrogel, (g) GA/SA3 DN hydrogel, (h) GA/SA4 DN hydrogel, and (i) GA/SA5 DN hydrogel. The scale bars were 200 μm while that of the magnified images were 20 μm.
