高比表面SiO_2纳米材料的制备与表征

Preparation and Characterization of High Specific Surface Area Silica Nanomaterials

以正硅酸乙酯(TEOS)为硅源,十六烷基三甲基溴化铵(CTAB)为表面活性剂,通过溶胶-凝胶法制备出高比表面积二氧化硅纳米材料,并考察了CTAB对比表面积的影响。利用X射线衍射、傅里叶红外光谱、低温氮吸附、扫描和透射电镜对所得样品的物相、结构、表面积及形貌进行了表征。结果表明,所得样品为无定形高比表面积二氧化硅,比表面积随着CTAB量的增加而增大,最大可达1001m^2/g。

Abstract Using TEOS and CTAB as silica source and surfactant, high specific surface area silica nanomaterials were synthesized from a sol-gel route. The crystalline phases, structure, surface area and morphology of the SiO2 samples were characterized by X-ray diffraction, Fourier transition infrared spectroscopy, N2 adsorption and scanning electron microscopy, and transmission electron microscopy. The results show that the samples mainly consist of amorphous high specific surface area silica, and surface area has an increase with CTAB contents extending. The specific surface area of SiO2 powders is more than 100lm^2/g.