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SEM images of Fc/PVP composite nanofibers from various solvent types of (a) pure ethanol; (b) ethanol/chloroform (v/v 1.3:1); (c) ethanol/DMF (v/v 11:9). The total PVP concentration is 10 wt % and the Fc concentration is 15 wt % with respect to PVP mass (voltage, 10 kV; work distance, 15 cm; flow rate, 1 mL/h).
