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Effect of solution concentration on the average nanofiber diameter distribution ((a): 144, (b): 172, and (c): 367 nm), respectively, from a 2% wt, 6% wt, and 8% wt chitosan/TFA solution (voltage: 20 kV; flow rate: 0.4 mL/h; tip-to-target distance: 10 cm; needle diameter: 0.6 mm).
