BECAS
KRAMER Gustavo Raul
congresos y reuniones científicas
Título:
EFFECT OF THE ANODIZING PARAMETERS ON THE MORPHOLOGY OF NANOSTRUCTURED FILMS OF ALUMINUM OXIDE
Autor/es:
F. A. BRUERA; G. R. KRAMER; M. L. VERA; A. E. ARES
Reunión:
Congreso; VI SAN LUIS CONFERENCE ON SURFACES, INTERFACES AND CATALYSIS; 2018
Resumen:
Nanoporous anodic aluminum oxide (AAO) films play an important role in nanotechnology due to their easily adjustable morphological properties and wide range of applications.1 Due to their large surface area per unit volume and their chemical inertness, these films are ideal platforms for catalytic applications.2 In this sense, the exhaustive and systematic characterization of the morphological properties of AAO coatings is fundamental. Among the most important variables in the synthesis of nanoporous films of AAO are the pretreatment of the substrate, the anodizing voltage, the nature, the concentration and the temperature of the electrolyte, which combined give rise to pores of different sizes and geometries.3, 4In general, most of the research has focused on obtaining anodic films using high purity aluminum as substrate (min 99.99% of Al), being the commercial alloy Al 1050 (min 99.5% of Al) an interesting substrate alternative for minimizing costs.3 In the present work, the Al 1050 alloy was used to synthesize AAO using 0.3 M and 0.9 M oxalic acid as an electrolyte, varying the electrolyte temperature (20, 30 and 40 °C) and the anodizing voltage (30, 40 and 60 V), with the aim of evaluating the effect of these variables on the morphological properties of anodic coatings. The morphology of the resulting oxides was characterized by optical microscopy and scanning electron microscopy, determining the pore diameter, the interpore distance, the pore density and the thickness of the coating. With each concentration of the electrolyte used, the results showed an increase in the pore diameter, the interpore distance and the film thickness as the anodization voltage and the electrolyte temperature increase, demonstrating the synergic effect of both variables, obtaining the highest values at 60 V and 40 °C. Consequently, the pore density decreased with increasing voltage and temperature of the solution. The nanoporous morphology of the coatings obtained on Al 1050 and the possibility of controlling their dimensions by varying the parameters of anodization, make the synthesis of these materials promising for catalytic applications.