Porous glass, having a pore size of around 10nm in diameter, was prepared from fluorine containing sodium borosilicate glass by treatments of phase-separation and acid leaching. A titanium oxide was anchored onto a platelet porous glass specimen of 0.5mm in thickness by impregnating with aqueous solution of titanium (III) chloride or titanium (IV) sulfate. The distribution of titanium concentration was homogeneous in the porous glass specimen as dried. However, in the specimen which was impregnated with a larger amount of TiO2 and heated in the temperature range of 200 to 500°C. The Ti-distribution was inhomogeneous showing a higher Ti-content in two areas on both side of the center of specimen.
