Unsupported TiO2 Research Articles

Physico-Chemical Properties of Supported and Unsupported γ-Al2-O3 and TiO2 Ceramic Membranes

Abstract Supported and unsupported γ-Al2O3 and TiO2 ceramic membranes have been prepared by sol-gel techniques from alkoxide precursors. Several physico-chemical properties of these materials have been determined. N2 sorption analysis has been used to determine pore size distributions and mean pore sizes. Particle sizes of sols as measured by “in situ” quasi-elastic light scattering are discussed in the light of SEM analyses of the sintered membranes prepared from these sols. Crack-free unsupported monoliths of Al2O3 with thicknesses up to 100 μm have been prepared. Similarly, supported Al2O3 and TiO2 membranes with thicknesses of 0.5 μm have been produced. Preliminary measurements of the permselectiyities of supported membranes have also been made.