Fig. 4
From: High-performance silk-based hybrid membranes employed for osmotic energy conversion
Effect of anodic aluminum oxide channel sizes. a The power density changes along with series of AAO channel sizes (from 20 to 200 nm) under different pH conditions. The thickness of the SNF membrane (10 μm) remains constant. b Zeta potential of SNF at pH from 3.00 to 11.00 in 0.01 M NaCl. Error bars represent s.d. c The power density of the hybrid membrane with the optimal channel size (80–100 nm) at pH 11.00 reaches 2.86 W m−2. d Schematically illustrating the effect of AAO size on the energy conversion of hybrid membrane. AAO channel in Models (1): 20–30 nm, (2): 40–70 nm, (3): 80–100 nm, (4): 110–150 nm, (5): 160–200 nm, respectively. The right inset: the isoelectric point of alumina is ~8–9
