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Photographs of the recovery profile of the CS1OP1C1 hydrogel (a); Stress–strain curves for unloaded and CO-loaded CS/OP hydrogels tested in a swollen state (b); Young’s modulus of all hydrogels was calculated from the slope between 2 and 10% of the linear part of stress-strain curves; (c); hysteresis curves for the CS/OP1-C1 (d) and CS/OP1-C5 (e) samples from uniaxial compression cycles recorded at 70% compression.
