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FE-SEM images of CS/PA-6 composite NFN membranes with different contents of CS (a) 0, (b) 1, (c) 1.5 and (d) 2 wt.%. (e) Electrical conductivity and (f) I–V characteristic of the composite NFN membranes with different contents of CS. Reprinted with permission from [138]. © 2011 Elsevier B.V.
