460870.fig.004a
460870.fig.004b
460870.fig.004c
460870.fig.004d
Figure 4: SEM images of AAO coatings with dense loading of various silica nanoparticles: (a) AAO film is 1 μm thick and loaded with 6.8 nm silica particles, (b) 1 μm thick AAO coating filled with 22 nm silica particles, (c) 60 μm thick AAO membrane loaded with 76 nm particles, and (d) 60 μm AAO film filled with simultaneous loading of 6.8 nm and 76 nm silica particles [42].