528290.fig.001a
(a)
528290.fig.001b
(b)
528290.fig.001c
(c)
528290.fig.001d
(d)
528290.fig.001e
(e)
528290.fig.001f
(f)
Figure 1: SEM images of the surface (a, c, and e), the cross sections (b, d, and f) of a MK-40 (a, b, c, and d), and a MK-40/Nf (e, f) ion-exchange membranes.