Abstract
The influence of temperature of oxalic acid on the formation of well-ordered porous anodic alumina on Al-0.5 wt% Mn alloys was studied. Porous anodic alumina has been produced on Al-0.5 wt% Mn substrate by single-step anodising at 50 V in 0.5 M oxalic acid at temperature ranged from 5°C to 25°C for 60 minutes. The steady-state current density increased accordingly with the temperature of oxalic acid. Hexagonal pore arrangement was formed on porous anodic alumina that was formed in oxalic acid of 5, 10 and 15°C while disordered porous anodic alumina was formed in oxalic acid of 20 and 25°C. The temperature of oxalic acid did not affect the pore diameter and interpore distance of porous anodic alumina. Both rate of increase of thickness and oxide mass increased steadily with increasing temperature of oxalic acid, but the current efficiency decreased as the temperature of oxalic acid increased due to enhanced oxide dissolution from pore wall.
Highlights
Porous anodic alumina (PAA) is a self-organizing porous material
PAA is a suitable template for the synthesis of nanostructured materials because its cell parameters such as pore diameter, interpore distance, and pore depth can be controlled by varying anodising conditions [7, 8]
We report a study of the effect of temperature of oxalic acid on the fabrication of wellordered PAA from Al-0.5 wt% Mn alloys
Summary
Porous anodic alumina (PAA) is a self-organizing porous material. After the confirmation of the classical cell model proposed by Keller et al [1], PAA has attracted enormous attraction as inexpensive template for the fabrication of various nanostructured materials without the need of costly and complex lithographic techniques [2,3,4,5,6]. Since owing to the commercial potential and scientific significance, there has been an ongoing research effort towards the fabrication of well-ordered PAA Prepatterning methods such as imprint lithography [12,13,14], focused ion beam lithography [15], and electron beam lithography [16] were developed for the fabrication of well-ordered PAA. These methods involved the formation of indented concave periodic patterns on the aluminium substrates prior to the anodising process. Critical high anodising potential which is the anodising potential required to induce high current density while preventing local current density concentration on the aluminium surface was applied during the high-field anodising
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