Several theoretical models have been formulated to explain the growth of porous structures in anodized alumina. Using some basic assumptions, these models predict the size and shape of the pores in the anodic porous alumina as functions of pH and voltage. Additionally, they address issues of stability in the pore growth. In this work, we have carried out a systematic experimental investigation to study the stability phase diagram as a function of pH and applied voltage. We also obtain the dependence of pore dimensions on the pH, voltage, and acid type. Based on our results, and insight gained from recent chemical analysis of the porous alumina anodization process, we conclude that the models must include an appropriate weighting factor to account for the oxidation and dissolution mechanism during the pore formation.
We demonstrate Co, Fe, and Ni encapsulated polyaniline (PAni) nanotubes using a three-step anodization and electrodeposition process. The electrodeposition process is used to create the tubes, as well as the wires, in a highly reliable manner. The metal-filled PAni structures embedded inside nanoporous alumina templates are fabricated in the form of an array. The magnetic properties of these structures are investigated as a function of temperature. These results are compared with the magnetic properties of nanowires embedded inside nanoporous alumina templates.
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