Figure 2

SEM images of composite membranes. (a–e) Front images of composite membranes, fumed silica contents are (a) 0.0 wt%, (b) 0.2 wt%, (c) 0.4 wt%, (d) 0.6 wt%, and (e) 0.8 wt%. (f): Reverse side image of PES/PEBA_0.6. (g): Cross-section image of PES/PEBA_0.6.