Figure 3. The injectable performance and self-healing capability of one CEC-l-OSA hydrogel (C_c = 0.02 g/mL).

(a) A disc-shaped hydrogel is formed after mixing CEC and OSA. (b) Gelled material was loaded into a syringe and squeezed out into the “2”, “0”, “1”, “5” spots in a number mold. (c) The gel fragments were self-healed into continuous “2015” structures after 5 minute-culture at 37 °C without any external intervention. (d–h) The self-healed structures were stable in PBS (pH 7.4) under shaking and inverting motions.