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Effect of high voltage on the average nanofiber diameter distribution ((a): 143, (b): 149, (c): 160, and (d): 212 nm), respectively, from a 6% wt chitosan/TFA solution (tip-to-target distance: 10 cm; flow rate: 0.4 mL/h), high voltage: 20, 18, 16, and 14 kV.
