Why Porous anodized alumina membrane is a cutting edge technology and its applications
Anodic aluminum oxide (AAO) membranes use chromic acid, sulfuric acid, oxalic acid & phosphoric acid for their formation. Porous and non-porous membranes are used for hydrogen separation and purification. Anodic alumina membranes have 2 major categories: • Porous alumina anodic membrane (PAA) • Non-Porous alumina anodic membrane Porous alumina anodic (PAA) membrane is ordered in parallel columnar way with hexagonal cells and its structure similar to novel pore structure and its various small pores embedded in each big shallow pore on the top layer of membrane and one pore in one cell at their bottom. Membrane cells are arranged in periodic arrangement from both sides. To create novel pore structure PAA membranes uses different current densities (30–200 mA cm−2) and it is obtained by maintaining constant voltage (40V. PAA membranes can be controlled with the adjustment of anodization voltage and current density simultaneously. Anodized alumina membrane types: 1- AAO on Aluminu...