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(a) (A) Fabrication of a stretchable, self-healing hydrogel–metal oxide composite for γ-ray radiation. (B) Diagram showing polyacrylamide chains hydrogen-bonded to Laponite within hydrogel composites. (C,D) Formation of new hydrogen bonds between cut polyacrylamide chains and Laponite via thermal diffusion [38]. (b) SEM of polyacrylamide SPH, reproduced with permission from ref. [70]. Copyright, Elsevier.
