纳米介孔二氧化硅中空纤维的合成

Synthesis and Characterization of Hollow Mesoporous Silica Fibers

以十六烷基氯化吡啶(C16PyCl)为模板剂,原硅酸四乙酯(TEOS)为硅源,甲酰胺为共溶剂,在酸性条件下合成了纳米介孔二氧化硅中空纤维,并使用扫描电镜(SEM)、小角X 射线衍射(SXRD)和N2气体吸附仪对其进行了表征。结果表明合成样品呈中空纤维形态,中空管内径约0．5-1μm,管壁厚度0．5μm左右,纤维长度可达50μm。中空纤维具有 MCM-41的有序六方孔道结构;煅烧后的样品显示典型的Ⅳ型吸附等温线和H1型滞后环,孔径分布很窄,BJH最可几孔径为2．72 nm,BET表面积1 212 m2·g-1。

Using cetylpyridinium chloride as the template, tetraethyl orthosilicate as the silica precursor, and formamide as the cosolvent, we synthesized hollow mesoporous silica fibers in acidic solution. Scanning electron microscope, small angle X-ray diffraction, and nitrogen adsorption techniques were used to characterize the as-synthesized and calcined samples. Results showed that the regular fibers with hollow tubular structure were obtained. The inside diameter of the hollow tubular was about 0.5 -1μm and the wall thickness was around 0.5 tan. Besides, the length of fiber was up to 50μm. The samples had hexagonal mesostructure analogous to MCM-41 and relatively narrow pore-size distributions. There existed a type Ⅳ adsorption isotherm and an H1 hysteresis loop in N2 adsorption-desorption curves. BET surface areas of the samples were 1212 m^2·g^-1 and the most probable pore diameter （using BJH method） was 2.72 nm.