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Physical and mechanical properties of the sandwich structure composite wound dressing. (a) Digital microscope image of the cross-section of the composite wound dressing. Scanning electron microscope (SEM) images of the (b) surface and (c) cross-section of the CS/COL sponge (500×). (d) SEM image of the interface between the layer of CSNWF/AgNPs and CS/COL sponge. (e) Biodegradation rate of the CS/COL sponge. (f) WVTR of the wound dressing
