519516.fig.004a
(a)
519516.fig.004b
(b)
519516.fig.004c
(c)
519516.fig.004d
(d)
519516.fig.004e
(e)
519516.fig.004f
(f)
Figure 4: SEM images (×5000) of nano fibers made of PVA/BS solution with volume ratios of (a) pure PVA, (b) 9 : 1, (c) 8 : 2, (d) 7 : 3, (e) 6 : 4, and (f) 5 : 5, by electrospinning. Scale bar: 10 μm.