Formation of dense alumina nanowires from anodic alumina membranes

Advancing and receding contact angle investigations for highly sticky and slippery aluminum surfaces fabricated from nanostructured anodic oxide

“…[15][16][17][18][19][20] Anodizing aluminum in a pyrophosphoric acid (H 4 P 2 O 7 ) solution causes the formation of numerous nanoscale anodic alumina nanobers. 21,22 Although similar alumina nanobers were formed by long-term anodizing in typical electrolyte solutions, such as oxalic and phosphoric acids, followed by chemical dissolution of the anodic oxide, [23][24][25] pyrophosphoric acid anodizing (PyAA) has the following major advantages: (a) the rapid formation of alumina nanobers within 2 min under the appropriate operating conditions; 22 (b) the ability to precisely control the surface nanostructures, such as independent standing nanober arrays, bundle structures with different scales, and high-aspectratio bending nanobers; 26 and (c) the successful fabrication of highly ordered alumina nanobers via two distinct anodizing processes. 27 These brous oxides can also be fabricated on various commercially available aluminum alloys, such as 1N30, 3004, and 8021.…”

Superhydrophilicity of a nanofiber-covered aluminum surface fabricated via pyrophosphoric acid anodizing

“…Recently, the fabrication of third-generation anodic oxide, anodic alumina nanofibers, which are different from the nanofeatures of barrier and porous oxides, has been reported by several research groups [31][32][33][34]. The fabrication processes for the alumina nanofibers are based on the typical anodizing in acidic solutions for the formation of porous alumina and the subsequent selective chemical etching of the porous alumina.…”