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(a) An optical photograph of a blank PVP nanofiber membrane; (b) SEM image of the blank PVP nanofiber membrane; (c) an optical photograph of a composite Fc/PVP nanofiber membrane; (d) SEM image of the composite Fc/PVP nanofiber membrane. (voltage, 10 kV; work distance, 15 cm; flow rate, 1 mL/h).
