Fig. 4

SEM images of the PCL fibers e-spun by using the hand-held apparatus under different spinning distances of a 5 cm, b 10 cm, c 15 cm, d 20 cm, e 25 cm. f statistical histogram of average fiber diameters. SEM images of the PCL fibers e-spun by using the hand-held apparatus under a spinning distance of 15 cm within different inner diameter spinneret. The spinneret model of g 17 G (1.07 mm), h 18 G (0.86 mm), i 19 G (0.67 mm), j 20 G (0.60 mm), k 21 G (0.50 mm). l Statistical histogram of average fiber diameters