Anodic alumina oxide (AAO) membrane prepared by anodizing of al not only has a simple process, but also contains uniform parallel pores and high pore density.

Dr Katz and his colleagues found that, although sodium ions flow readily in between adjacent aluminium-oxide layers of sodium beta-alumina, they cannot pass between them.

The new rare earth pigment was synthesized by adjusting ratio of neodymium and aluminum and adopting different mineralizer, using neodymium oxide and alumina as main raw material.