Structure of Duplex Oxide Layer in Porous Alumina Studied by 27Al MAS and MQMAS NMR

Abstract

Abstract A local structure analysis using 27Al multiple-quantum magic-angle-spinning (MQMAS) and MAS NMR techniques has been performed on porous alumina fabricated by the anodic oxidation of aluminum. It is suggested that the main constituents of the inner and outer oxide layers composing porous alumina are [AlO4 and AlO5] and [AlO6], respectively, and that both of the layers adopt the amorphous structure.