Fig. 3.

(a) Adhesive strengths and (b) Lap shear curve of DBAH containing different kind of CS-MA on two pieces of porcine skin. The single biometic PDA-PAM hydrogel free of CS-MA as control; (c) Scanning electron micrographs of the interface between the hydrogel and the porcine skin; (d) Schematic illustration showing a potential mechanism of the tissue adhesion of DBAH. (e, f) Photographs of the DBAH adhering to the tissue. No detachment was observed between the hydrogel and tissue regardless of bending, distorting, and even under water flushing. (g) Photos of the multiple times repeatable adhering–peeling process of DBAH on the author's arm while no irritability.