抄録
Mesoporous titania has been prepared by the sol-gel method with surfactant templating. The wet gels, obtained by hydrolysis of Ti-alkoxide in alcoholic solutions with acid catalyst, were immersed in surfactant solutions, dried and annealed. The annealed gels were labeled with 228Th and 224Ra, and the release rate of 220Rn, produced by α-decay, was measured during heating and cooling to obtain the ETA-curves. The gels were also characterized with TGA-DTA, XRD, nitrogen adsorption, SEM and AFM. The pore size and the microstructure of the gels obviously depended on the size and shape of the surfactant micelles. The ETA results clearly showed the differences in the surface area and the thermal stability of the annealed gels. The evaluated ETA results and the structural changes of the gels during heating were discussed.
