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Effect of needle diameter on the average nanofiber diameter distribution ((a): 226, (b): 218, (c): 172, and (d): 134 nm), respectively, from a 6% wt chitosan /TFA solution (high voltage: 20 kV; flow rate: 0.4 mL/h, tip-to-target distance: 10 cm), needle diameter: 0.6, 0.5, 0.4, and 0.3 mm.
