中文摘要：

在烷基聚乙烯氧化物（PEO）表面活性剂存在下采用水热或醇热方法合成出了介孔氧化钛，并与无模板体系室温溶胶-凝胶制备的介孔氧化钛进行了比较．这些不同方法制备的氧化钛的结构和特性及形成机理都有明显的不同．在酸性水溶液介质中可合成出双结晶（锐钛矿和板钛矿）结构的、热稳定的、介孔氧化钛，而在醇介质中合成出具有内部大孔结构的介孔氧化钛，其中的介孔是无序分布的呈蠕虫状、由锐钛矿相的氧化钛纳米颗粒聚集形成．无模板溶胶一凝胶制备的介孔氧化钛在焙烧后可得到孔分布11．2nm的不规则介孔洞．对表面活性剂在介孔结构氧化钛合成中的作用进行了讨论．

英文摘要：

Mesoporous titanias have been synthesized by either hydrothermal or alcothermal method in the presence of alkyl poly（ethylene oxide） （PEO） surfactants, and compared with those prepared by template-free room-temperature sol-gel route. The structures and properties of these titania materials are quite different, as well as their formation mechanisms. Thermostable mesoporous titanias with bicrystlline （anatase and brookite） structure were synthesized in acidic aqueous media. Mesoporous titanias with an interior macroporous structure were prepared in ethanol media, in which the mesopores were disordered, wormhole-like, formed by the agglomeration of titania nanoparticles with anatase phase. Narrow pore size distribution at 11.2 nm of irregular mesovoids was obtained in the template-free sol-gel prepared titania after calcination. The role of surfactant templates in the synthesis of mesostructured titanias is discussed.