(中南大学 材料科学与工程学院，长沙 410083)
摘 要: 以钛酸丁酯(TTIP)为前驱体、乙酸为催化剂、甲酰胺为干燥控制化学添加剂，通过控制原料中TTIP与H2O的摩尔比以及老化液中H2O与乙醇(EtOH)的摩尔比，并结合常压干燥工艺，制备块状TiO2气凝胶。采用XRD、BET、SEM和FT-IR等对样品进行表征。结果表明，当原料中TTIP与H2O的摩尔比为1:4、老化液中H2O与EtOH的摩尔比为5:2时，TiO2气凝胶具有最小表观密度(0.15 g/cm3)、最大比表面积(573.4 m2/g)、孔径分布集中、块体体积约为16.0 cm3。
关键字: TiO2气凝胶；溶胶-凝胶法；常压干燥法
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:TiO2 aerogels with block size were prepared by ambient pressure drying process via sol-gel technology using tetrabutyl orthotitanate (TTIP) as precursor, acetic acid as catalyst, formamide as drying control chemical additive. The influencing factors of the molar ratio of TTIP to H2O, the molar ratio of H2O to EtOH in the aging liquid were analyzed. The structures of the samples were characterized by XRD, BET, SEM and FT-IR. The results indicate that when molar ratios of TTIP to H2O and H2O to EtOH are 1:4 and 5:2, respectively, the prepared TiO2 aerogels have the best performance of the least bulk density of 0.15 g/cm3, the largest specific surface area of 573.4 m2/g, and the block volume of about 16.0 cm3.
Key words: TiO2 aerogel; sol-gel method; ambient pressure drying
