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SEM images of (a) surface and (b) interface of MWCNTs-COOH/gelatin-chitosan composite (punctured tips of the MWCNTs is visible inside the dashed circular area); (c) fractured surfaces of MWCNTs-COOH/gelatin-chitosan composites (pulled out tips of the MWCNTs is visible inside the dashed circular area) and (d) pure gelatin film.
