title: From alumina nanopores to nanotubes: dependence on the geometry of anodization system.
abstract: The Conventional anodization of commercial aluminum sheets with a phosphoric acid electrolyte was employed for the preparation of alumina nanopore and/or nanotube structures. Modifying the system geometry (the ratio of platinum to aluminum electrode areas) controlled the nature of the anodization process (mild to hard). Nanotube formation was observed after low temperature preferential chemical etching of the defective corners of the hexagonal alumina cells using the same solution from the anodization process. Electrode geometry can be used to combine mild and hard anodization with low temperature etching to tune the alumina morphology from 100% nanopores to 100% nanotubos coverage.
authors: Instituto de Física, Universidade Federal do Rio Grande do Sul, UFRGS, Av. Bento Gonçalves 9500, PO Box 15051, 91501-970, Porto Alegre, RS, Brazil.
authors: Adriano F
authors: AF
authors: Feil
authors: Marlla V
authors: MV
authors: da Costa
authors: Pedro
authors: P
authors: Migowski
authors: Jaïrton
authors: J
authors: Dupont
authors: Sérgio R
authors: SR
authors: Teixeira
authors: Lívio
authors: L
authors: Amaral
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D003460:Crystallization / Q000379:methods; D004566:Electrodes; D004595:Electroplating / Q000295:instrumentation / Q000379:methods*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D016062:Porosity; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D000537:Aluminum Oxide