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以氧氯化锆和二甲基二乙氧基硅烷为前驱体,在无任何表面活性剂的条件下,利用溶胶-凝胶法制备了片状SiO_2/ZrO_2复合材料.采用X射线衍射仪、扫描电镜、能谱仪、傅立叶变换红外光谱仪、透射电镜等分析了产物的结构和形貌,并探讨了SiO_2/ZrIO_2纳米复合材料的取向生长机理.结果表明,在正丁醇和水的混合溶液中制备的SiO_2/ZrO_2纳米复合材料的粒径为18nm,将干凝胶的500℃空气气氛中焙烧2h可以得到四方相片状氧化锆晶体.化合物中的硅原子通过Si—O—Zr化学键与锆原子相连;硅的引入仅影响氧化锆晶体的形貌,而不导致四方相氧化锆结构和尺寸的改变.本文所述方法可望拓展用于制备其他具有类似分级结构的无机功能纳米材料.
SiO 2 / ZrO 2 composites were prepared by sol-gel method without any surfactant using zirconium oxychloride and dimethyldiethoxysilane as precursors.Using X-ray diffractometer, SEM, EDS, FTIR and TEM were used to analyze the structure and morphology of the product, and the orientation growth mechanism of SiO_2 / ZrIO_2 nanocomposites was discussed. The results show that in the mixed solution of n-butanol and water The prepared SiO 2 / ZrO 2 nanocomposite has a particle size of 18 nm, and the xerogel tetragonal zirconia crystal can be obtained by calcining the xerogel in air at 500 ° C. for 2 h. The silicon atom in the compound is bonded to the zirconium atom through a Si-O-Zr chemical bond The introduction of silicon only affects the morphology of the zirconia crystals without changing the structure and size of the tetragonal zirconia.The method described in this paper is expected to be extended to prepare other inorganic functional nanomaterials with similar hierarchical structure.