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Preparation and Structural Characterization of SiO_2-ZrO_2 Aerogels

机译：SiO_2-ZrO_2气凝胶的制备及结构表征

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摘要

Low density SiO_2-xZrO_2 aerogels with x=35wt%, 65wt%, 75wt%, 90wt%, 95wt% were prepared by CO_2 supercritical drying technique with tetraethylorthosilicate (TEOS) and zirconyl nitrate dihydrate (ZrO(NO_3)2 2H_2O) by hydrolytic polycondensation under different chemical conditions. The prepared aerogels are performed by X-ray Diffraction (XRD), Transmission electron microscopy (TEM), Fourier transformed infrared spectroscopy (FT-IR) and BET surface areas to characterize and analyze the morphology and pore structure of SiO_2-ZrO_2 aerogels. The results showed that the SiO_2-ZrO_2 areogels are the typical of nano mesopores and the average pore size is about 50 nm. The specific surface areas varied from 345.5 to 615.5 m~2/g with (S_(BET))_(MAX)= 615.5 m~2/g with 20wt% Zirconia; Moreover a mass of Si-O-Zr bands formed in the aerogels and the formation mechanism of Si-O-Zr bands are also discussed.
机译：采用原硅酸四乙酯（TEOS）和硝酸氧锆二水合物（ZrO（NO_3）2 2H_2O）通过水解缩聚反应，通过CO_2超临界干燥技术制备了x = 35wt％，65wt％，75wt％，90wt％，95wt％的低密度SiO_2-xZrO_2气凝胶。在不同的化学条件下。通过X射线衍射（XRD），透射电子显微镜（TEM），傅立叶变换红外光谱（FT-IR）和BET表面积来制备所制备的气凝胶，以表征和分析SiO_2-ZrO_2气凝胶的形态和孔结构。结果表明，SiO_2-ZrO_2是典型的纳米介孔，平均孔径约为50nm。当（S_（BET））_（MAX）= 615.5m〜2 / g和20wt％的氧化锆时，比表面积为345.5至615.5m〜2 / g。此外，还讨论了在气凝胶中形成的大量Si-O-Zr带和Si-O-Zr带的形成机理。

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