Mesoporous structure of Al2O3 prepared from poly(N-vinylpyrrolidone)-modified sols of hydrous metal oxides

Mesoporous alumina with a narrow effective pore diameter distribution has been prepared using poly(N-vinylpyrrolidone)-modified sols of hydrous Al₂O₃ and Al₂O₃-ZrO₂. We compare the microstructures of nanoporous aluminas prepared from electrochemically produced unmodified and modified sols of hydrous oxides and describe the formation of highly ordered mesoporous structures from a mixture of modified sols of hydrous metal oxides differing in chemical nature. Microstructural studies of uni-and biporous permeable nanosystems during heat treatment demonstrate that the pore diameter distribution in the mesoporous oxides prepared from the modified sols remains unchanged at calcination temperatures of 700°C and lower. The microstructure and phase composition of the oxides depend on the initial properties of the sols. Original Russian Text ? T.M. Zima, N.I. Baklanova, N.Z. Lyakhov, 2008, published in Neorganicheskie Materialy, 2008, Vol. 44, No. 2, pp. 189–197.