表面活性剂浓度对介孔二氧化硅形貌的影响

Effect of Template Concentration on the Morphologies of Mesoporous Silica

以十六烷基氯化吡啶(C16PyCl)为模板剂,正硅酸四乙酯(TEOS)为硅前驱体,甲酰胺为助溶剂,在酸性条件下合成了不同形状的纳米介孔二氧化硅,并使用扫描电镜(SEM)、小角X射线衍射(SXRD)和N2气体吸附技术对其进行了表征。结果表明合成样品具有MCM-41的有序六方孔道结构,煅烧样品的吸附测量显示典型的IV型吸附等温线和H1型滞后环,孔径分布较窄。随着C16PyCl浓度的增加,产物形貌由不规则的螺旋球逐渐过渡到表面光洁的多面体形状。

The ordered mesoporous silicas with particular morphology were synthesized by using cetylpyridinium chloride as the structure directing agent, formamide as the cosolvent and tetraethyl orthosilicate as silica precursor. The samples were characterized by scanning electron microscope, X- ray diffraction and nitrogen ad- sorption technique. Results demonstrated that the samples had hexagonal mesostmcture analogous to MCM - 41. Type IV isotherm and H1 hysteresis loops occurred in nitrogen adsorption desorption curves. Furthermore, with the increase of the concentration of cetylpyridinium chloride, particle shape changed from irregular gyroid to polyhedron.