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The microscopic morphology of PVP/PVA hydrogel and OF/PVP/PVA hydrogels with the concentration of 100 μg/mL under SEM. (A): SEM images of PVP/PVA (left: ×200; right: ×1000). (B): SEM images of OF/PVP/PVA hydrogel with a concentration of 100 μg/mL (left: ×200; right: ×1000).
