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SEM images of PVA: EXT nanofibers electrospun at solution flow rate of 1mL/hour and applied voltage of 16kv from PVA solutions of concentration (w/w): (a) 6%, (c) 8%, (e) 10%, and (g) 12%. Their corresponding fiber diameter distribution histograms are shown in (b), (d), (f), and (h).
