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FE SEM images showing the PA-6 NFN membranes containing 1.5 wt% salts: (a) NaCl, (b) KBr, (c) CaCl2, and (d) H2PtCl6. (e) Effect of the salt addition on the viscosity and electrical conductivity of PA-6 solutions. Reprinted with permission from [34]. © 2009 Elsevier B.V.
