Figure 4From: Use of Ionic Liquid in Fabrication, Characterization, and Processing of Anodic Porous AluminaTypical APA inner surface, in which the closed pore bottoms have been partly opened by immersion in 1 M oxalic acid at 30 °C for 30 min, in the following conditions:a APA after cleaning only andb APA after cleaning and keeping in 10% IL2 aqueous solution for 10 min. Both images have been smoothed with a 3x3 kernel Gaussian filterBack to article page