(中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 以鈦酸丁酯(TTIP)為前驅(qū)體、乙酸為催化劑、甲酰胺為干燥控制化學(xué)添加劑，通過控制原料中TTIP與H2O的摩爾比以及老化液中H2O與乙醇(EtOH)的摩爾比，并結(jié)合常壓干燥工藝，制備塊狀TiO2氣凝膠。采用XRD、BET、SEM和FT-IR等對(duì)樣品進(jìn)行表征。結(jié)果表明，當(dāng)原料中TTIP與H2O的摩爾比為1:4、老化液中H2O與EtOH的摩爾比為5:2時(shí)，TiO2氣凝膠具有最小表觀密度(0.15 g/cm3)、最大比表面積(573.4 m2/g)、孔徑分布集中、塊體體積約為16.0 cm3。
關(guān)鍵字: TiO2氣凝膠；溶膠-凝膠法；常壓干燥法
（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
