Fig. 6From: Controlling the Secondary Surface Morphology of Electrospun PVDF Nanofibers by Regulating the Solvent and Relative HumidityRepresentative SEM images of samples fabricated by electrospinning 25% (w/v) PVDF solutions from ACE/DMF at different levels of relative humidity (5%, 25%, 45%, and 65%) and solvent ratios. a–d 4:1, e–h 2:1, i–l 1:1, m–p 1:2, and q–t 1:4Back to article page