Heterogeneous mesoporous oxides grown in porous anodic alumina

摘要

Heterogeneous mesoporous oxide structures consisting of adjacent domains of mesoporous titania and silica (TiO_2/SiO_2) were synthesized by sequential deposition into the pores of a porous anodic aluminum oxide (AAO) support.Each anodic alumina macropore contained distinct mesoporous structural domains corresponding to the two oxide structures.Transmission electron microscopy imaging showed that the titania and silica regions contained organized pores with diameters of approx 8-10 nm and approx 13-16 nm,respectively.Nitrogen adsorption measurements showed a typical Type IV behavior characteristic of mesoporous materials.The surface area for the heterogeneous composites ranged between approx 75 and approx 100 m~2/g.Gas permeability measurements of the samples indicated complete filling of the AAO support by the mesoporous TiO_2/SiO_2 regions.Preliminary results regarding the possibility of extending this method to mesoporous ZrO_2/SiO_2 compositions are also presented.