Nanoporous alumina

Pore diameter adjustable from 25 nm up to 90 nm and from 180 nm up to 400 nm Interpore distance (fix): 65 nm, 125 nm or 480 nm Standard deviation < 10% Flow-through-membrane with symmetric pores Porous ceramics with one-side-closed pores (also on aluminum) Pore depth from 200 nm up to 200 µm Porosity adjustable starting from 10% Thermal stable up to 1000 ºC (depending on the environment)

Nanoporous alumina is a ceramic material fabricated by means of an electrochemical etching process of pure aluminum. The material can be used directly as transparent or white (depending on the pore diameter) membrane or as a one-side-closed template for the formation of nanostructures. The product is an amorphous oxide which can be changed to a crystalline structure by heating up. The pore diameter can be adjusted exactly within a nanometer scale.The SmartPor membranes offer round pores with an unique pore diameter (deviation lower 10%) which stays constant through the complete length of the pores. The pores are arranged hexagonally within the single grains of the aluminum.