Synthesis of hollow spherical silica with MCM-41 mesoporous structure
Synthesis of hollow spherical silica with MCM-41 mesoporous structure
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DOI：
10.1007/s00396-004-1120-5
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发表时间：
2004-04
影响因子：
2.4
通讯作者：
Shuhua Han;W. Hou;Jun Xu;Zhengmin Li
中科院分区：
文献类型：
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作者：
Shuhua Han;W. Hou;Jun Xu;Zhengmin Li
通过使用硅酸钠作为前体和低浓度的十六烷基三甲基溴化铵（CTAB）（0.154 mol dm-3）合成中空球形介孔二氧化硅。采用扫描电子显微镜（SEM）、小角X射线衍射（SXRD）、透射电子显微镜（TEM）和N2气体吸附脱附技术对所得空心球形粒子进行了表征。结果表明，当正丙醇与十六烷基三甲基溴化铵的摩尔比为8：1-9：1时，可以得到规则的球形介孔氧化硅。球形颗粒是中空的（内部），并且壳由具有六方对称孔结构的较小颗粒组成。随着正丙醇与十六烷基三甲基溴化铵摩尔比的增加，两相邻孔中心之间的距离（a值）增大，介孔氧化硅的孔结构变得不那么有序。N2吸附-脱附曲线显示IV型等温线和H1滞后回线;随着正丙醇与CTAB摩尔比的增加，最可几分布孔径（BJH）减小，孔径分布峰的半峰宽增大
Hollow spherical mesoporous silica was synthesized by using sodium silicate as a precursor and a low concentration of cetyltrimethylammonium bromide (CTAB) (0.154 mol dm−3). The resulting hollow spherical particles were characterized with scanning electron microcopy (SEM), small-angle X-ray diffraction (SXRD), transmission electron microscopy (TEM), and N2gas adsorption and desorption techniques. The results showed that regular spherical mesoporous silica could be obtained only if the molar ratio of propanol to CTAB was in the range of approximately 8:1–9:1. The spherical particles were hollow (inside), and the shell consisted of smaller particles with a pore structure of hexagonal symmetry. With an increase of the molar ratio of propanol to CTAB, the distance (avalue) between centers of two adjacent pores increased, and the pore structure of mesoporous silica became less ordered. N2adsorption–desorption curves revealed type IV isotherms and H1 hysteresis loops; with an increase of the molar ratio of propanol to CTAB, the pore size with Barrett–Joyner–Halenda (BJH) diameter of the most probable distribution decreased, but the half peak width of the pore size distribution peak increased