Fig. 1.

(a) The HA-based hydrogel could be easily prepared through a one-step mixing-injection with a hand-made dual syringe. The hydrogel showed efficient self-recovery after being cut. (b) The SEM images of the HA-based hydrogel at different solid concentration. Scale bar: 100 μm (first line) and 30 μm (second line). (c) The photographs of HA-based hydrogel before and after reaching swelling equilibrium. (d) The swelling ratio curves for the HA-based hydrogel. Rheological (e) time sweep and (f) strain sweep of the HA-based hydrogel. (g) Time sweep testing of the HA-based hydrogel under alternating low/high strain (1%/300%). The shaded area represents the time sweep under high strain. Solid icon: storage modulus, hollow icon: loss modulus.