水热-凝胶法ZrO_2气凝胶的制备与表征

Synthesis and Characterization of Zirconia Aerogels by Hydrothermal-Gel Method

以硝酸氧锆为锆源，尿素为凝胶促进剂，通过水热凝胶法结合超临界乙醇干燥，可成功制备出具有良好纳米三维网络结构的ZrO2气凝胶。采用透射电镜（TEM）、比表面积及孔隙度分析仪（BET），X射线衍射仪等测试手段对其结构进行了表征与测试。结果表明，ZrO2气凝胶主要由无定型和四方晶相组成，其比表面积为445㎡／g，孔径主要分布在5～7nm和30-40Flm两处。

Zirconia aerogels, which process good nano-network structure, were prepared by hydrothermal-gel method using zirconium oxynitrate as precursor and carbamide as gelation accelerator, followed by supercritical fluid drying. The structure of the porous zirconia aerogels was investigated by the measurement of pore size distribution, TEM, BET, and XRD. The results show that the as-prepared zirconia aerogels with a high specific surface area of 445 ㎡/g consist of the amorphous and tetragonal phase. The pore size distributions of as-prepared aerogels have two sig- nificant maxima：5 to 7 nm and 30 to 40 nm.