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Effect of tip-to-target distance on the average nanofiber diameter distribution ((a): 258, (b): 2556, (c): 228, and (d): 179 nm), respectively, from a 6% wt chitosan/TFA solution (high voltage: 20 kV; flow rate: 0.4 mL/h), distance: 12, 14, 16, and 18 cm.
