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Ionic self-healing hydrogel with inorganic salts. (a) Schematic for the preparation of PAM/CMC/NaCl composite hydrogels. (b) Conductivity diagrams of hydrogel before and after healing. (c) Tensile stress–strain curves of the composite hydrogels prepared with various CNaCl. (d) The conductivity of the hydrogels prepared with various content of NaCl.
