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Characterization of the chitosan/silk hydrogel sponge. (A) Morphology of dry hydrogel sponge (a) and wet hydrogel sponge (b). (B) FTIR spectra of the chitosan/silk hydrogel sponge. (C) Swelling degree of the hydrogel in different medium at different time. (D) Moisture retention capacity of the hydrogel sponge. (E) SEM images of hydrogel surface (a: 30×; b: 100×; c: 400×; d: 1,000×) (F) SEM images of cross-sections of hydrogel (a: 30×; b: 100×; c: 400×; d: 1,000×).
