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FE-SEM images of the PLA/chitosan fibrous membranes prepared at different concentrations: (a,b) 4 wt % PLA, 1 wt % CS; (c,d) 5 wt % PLA, 1.25 wt % CS; (e,f) 6 wt % PLA, 1.5 wt % CS; (g,h) 7 wt % PLA, 1.75 wt % CS; and (i,j) 8 wt % PLA, 2 wt % CS.
