利用溶剂热法以钛酸丁脂作为钛源，采用盐酸、氢氧化钠溶液调节体系的pH，在未进行水洗或者酸洗等后处理情况下制备出钛酸（H₂Ti₂O₅·H₂O）、钛酸钠（Na₂T_ⁱ2O₄(OH)₂）纳米管。采用X-射线衍射（XRD）、透射电镜（TEM）、高分辨透射电镜（HRTEM）和X-射线能谱（EDS）等测试手段对制备出的纳米材料的物性、形貌等进行表征，研究了钛酸、钛酸钠纳米管的形成条件。结果表明，当pH为8～9时产品为钛酸，当pH为12～13时产品为钛酸钠。讨论了纳米管的形成过程，认为反应首先生成钛酸、钛酸钠纳米片，在反应釜高温高压环境下，纳米片边缘相互作用力减小，为了保持结构的稳定性，边缘逐渐发生卷曲，进而形成钛酸或者钛酸钠纳米管。

Nanotubes of H₂Ti₂O₅·H₂O and Na₂Ti₂O₄(OH)₂ have been synthesized by a solvothermal method using tetrabutyl orthotitanate as titanium source with the pH being adjusted by addition of sodium hydroxide or hydrochloric acid solution, without any post-treatment with hydrochloric acid or water being required. The composition, morphology and structure of the samples were determined by XRD, HRTEM, TEM and EDS. When pH values of 8-9 were employed, H₂Ti₂O₅·H
₂O was obtained whereas at pH 12-13, Na₂Ti₂O₄(OH)₂ was formed. It is proposed that the process involves initial formation of a sheet-like structure, which curls into a tube-like structure under the high temperatures and pressures in the solvothermal system, resulting in the final nanotube structures.