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Self-healing experiments. (a) Original hydrogel. (b) Original hydrogel after being cut. (c) Self-healed hydrogel after healing for 2.5 h and (d) stretching of self-healed hydrogel. Reprinted from self-healing and conductivity of chitosan-based hydrogels formed by the migration of ferric ions [106]. Copyright © 2020 Wiley Periodicals, Inc.
