Fig. 4From: Controlling the Secondary Surface Morphology of Electrospun PVDF Nanofibers by Regulating the Solvent and Relative HumidityRepresentative SEM images of samples fabricated by electrospinning 35% (w/v) PVDF solution from DMF at different levels of relative humidity. a 5%, b 25%, c 45%, and d 65%Back to article page