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Adhesive properties of the PDA-PAM/Mg2+ hydrogel. (a) Adhesion effect of the hydrogel on human elbow during exercise. (b) Digital images demonstrating the macroscopic adhesion of the hydrogel to various substrates. (c) Schematic illustration of tensile-adhesion testing and adhesion mechanism of hydrogel on tissue. (d) Adhesive strengths of hydrogels on various substrates (glass, PE, Al, and skin).
