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FE-SEM images of PAA/NaCl NFN membranes obtained at different RH: (a) 45% and (b) 60%. Reprinted with permission from [31]. © 2011 Royal Society of Chemistry. (c) FE-SEM image of gelatin/NaCl NFN membranes obtained at RH of 45%. Reprinted with permission from [108]. © 2011 Elsevier B.V. (d) FE-SEM image of PU/NaCl NFN membranes obtained at RH of 55%. Reprinted with permission from [30]. © 2011 WILEY-VCH Verlag GmbH & Co.
