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SEM images of (a) PTT/CNT (reprinted with permission from [174]. © 2011 Elsevier B.V.), (b) PEO/CNCs (reprinted with permission from [177]. © 2011 American Chemical Society), (c) gelatin (reprinted with permission from [108]. © 2011 Elsevier B.V.), (d) CS (reprinted with permission from [198]. © 2010 Walter de Gruyter GmbH & Co. KG), and (e) Bombyx mori silk/SWCNT (reprinted with permission from [112]. © 2006 American Chemical Society) NFN membranes.
