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SEM images of PAA fibrous membranes formed in PAA solution combined with (a) H2O and (b) ethanol at a concentration of 6 wt%, voltage of 30 kV, spinning distance of 15 cm and humidity of 20%. (c) High magnification SEM image taken from the sample shown in (b). Reprinted with permission from [33]. © 2006 IOP Publishing Ltd.
