875815.fig.008
Figure 8: (A): BPM4 (d = 112 nm, 3% PTFE); (B): BPM7 (d = 54 nm, 18% PTFE); (C): BPM8 (48 nm, 30% PTFE); (D): BPM11 (d = 35 nm, 80% PTFE).