Figure 6.

The injectability and self-healing assessments of the self-crosslinkable hydrogels at weight ratios of 2:1 oxidized alginate to carboxymethyl chitosan. (A,B) Hydrogel sol–gel transition. (C,D) Hydrogels’ injectability confirmed by drawing of letters “ABCD” using the formed disk-shaped hydrogel as ink after placing it in a 3 mL syringe. (E) Hydrogels’ injectability confirmed by extrusion without clogging through a 20-gauge needle into a 10 mL beaker. (F,G) Self-healing of injected hydrogel fragments and self-healing/reformation in a single piece after 10 min incubation at 37 °C. (H) Confirmation of hydrogels stability and integrity after self-healing through immersion in PBS.