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(a) The cyclic loading–unloading mechanical performance of PHC/Ca2+/SiO2 NPs conductive hydrogels under different strains. (b) Cyclic stress–strain test at a strain of 200% with different rest intervals, and (c) the corresponding dissipated energy recovery ratio. (d) The ten times continuous loading-unloading tensile test at 300% applied strain with no relaxation time between each cycle.
