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SEM images of nanofibers under different conditions of the spinning process. (A) 55 kV, 10 wt %; (B) 60 kV, 10 wt %; (C) 65 kV, 10 wt %; (D) 55 kV, 11 wt %; (E) 60 kV, 11 wt %; (F) 65 kV, 11 wt %; (G) 55 kV, 12 wt %; (H) 60 kV, 12 wt %; (I) 65 kV, 12 wt %. Scale bar = 5 μm.
