Fig. 3From: Fabrication of CA/TPU Helical Nanofibers and its Mechanism AnalysisSEM images of the single electrospinning experiments from a 18 wt% TPU1 in DMAc/THF of 3/1 volume ratio b 18 wt% TPU2 in DMAc/acetone of 3/1 volume ratio. The applied voltage is 15 kV, the working distance is 10 cm, and the flow rate is 0.15 ml/hBack to article page