Synthesis And Characterization Of The Morphology Controllable Functionalized Mesoporous Materials

The highly ordered mesoporous materials have attracted much interest in the chemistry and material fields since the discovery of M41S in the early 1990s. Because of the large surface areas and pore volumes, unique and tunable pore sizes within 2-50 nm, highly ordered mesostructures and modifiable surface properties, these mesoporous materials are expected to be applied in heterogeneous catalysis, separation, medicine, optics and electronics. Due to the framework of the most current mesoporous materials is composed of SiO2, which only possess a little of weak acid centers, they are almost catalytic inactive. To make the silica based mesoporous materials possess catalytic active, embedding hetero atoms into the silica framework or modifying the framework of silicas with organic functional groups have been widely applied, and it is becoming one of the hottest topics in the field of mesoporou materials.In this thesis, some organic-functionalized SBA-15 have been synthesized by the grafting of N-(2-aminoethyl)-3-aminopropyl- trmethoxysilane or cocondensation of TEOS and organic silane, such as N-(2-aminoethyl)-3-aminopropyltrmethoxysilane and 3-chrolopropyltriethoxysilane. Their mesoporous behaviour were analysized by Powder X-ray diffraction,nitrogen sorption test,transmission electron microscopy (TEM),and their morphologies were observed by scanning electron microscopy (SEM). Compared with the results that the grafting method can perfectly retain the mesostructures and morphologies of parent materials, one-pot condensation is good for the volume amount, pore size and and organic percentage of silica mesoporous materials.In addition, a new organic-functionalized hexagonal mesoporous materials was synthesized by one-pot condensation of TEOS and N-(2-aminoethyl)-3-amino- propyltrmethoxysilane in the directing of anion surfactant SDS. Its porous character and morphologies were analysized by Powder X-ray diffraction,nitrogen sorption test,transmission electron microscopy (TEM) and scanning electron microscopy (SEM). For this organic-functional mesoporous materials, A new template-removal protocol was developed by the properties of SDS. That is, the template of mesoporous materials was degraded in the acidic crystallization process for the acidic instability of SDS.