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(A) Schematic illustration of the recoverable and self-healing process of the GPNs gel. After touching for a few minutes, the two pieces of the cutting hydrogels demonstrated fast healing and presented excellent tensile strength and restorability. (B) Photographs of the reversible actuation of the GPNs/NS bilayer hydrogel in NaCl and HCl solutions. Adapted and modified with permission from ref (364). Copyright 2020 Royal Society of Chemistry.
