(a)

(b)

(c)

Figure 2: SEM images of electrospun PA6.6 mats when the speed of support material was (a) v = 0.010 m/s, t = 25 s (I); (b) v = 0.006 m/s, t = 42 s (II); (c) v = 0.002 m/s, t = 125 s (III).