Preparation, Characterization And Application Of Mesoporous Al₂O₃, SiO₂, TiO₂-SiO₂

In this thesis, the synthesis, characterization, method for tuning pore size about mesoporous materials, improvement and application are summarized. Besides, several mesoporous materials were synthesized. They are mesostructured Al₂O₃, SiO₂ with large mesopores, amino-functionalized mesostructured SiO₂ film and mesoporous TiO₂-SiO₂ mixed oxide mesoporous materials. Their application is also described.The main research work is as follows:1. Large mesoporous alumina have been prepared by the hydrolysis of aluminum tri-sec-butoxide in the presence of cetyltrimethylammonium bromide (CTAB) using oil-in-water microemulsion template in basic condition. The material were detected by TEM, XRD, DTA, TGA and nitrogen sorption. The relationship between synthsis condition and pore size was also discussed. These resulting materials showed a disordered mesostructure with large mesopore frameworks. It is found to convert the intermediate phase(hydrated pseudoboehmite) into γ-Al₂O₂ at 268.7°C. The large mesoporous alumina materials possess relative narrow mesoporous size distribution, high surface area (407.2m²/g) and pore volum (0.877cm³/g). The prepared materials exhibited higher performance as catalyst support than that of the similar commercial γ-Al₂O₃ granules.2. Amino-functionalized mesostructured cellular foams (AF-MCFs) with large mesopores have been prepared by co-condensation of tetraethoxysilane (TEOS) and 3-Aminopropyl-triethoxysilane (ATES) using oil-in-water microemulsion template. The material was characterized by TEM, SEM, XRD, FT—IR and nitrogen sorption.These resulting materials had disordered mesopores with well-defined large mesopore frameworks (mean pore size: 10.8nm) and amino-functional groups adding to their interior surfaces. The surface area is 414.89m²/g and total pore volume is 1.43cm³/g.3. Ordered amino-functionalized mesoporous organic-inorganic hybrid silica thin films were prepared by evaporation induced self-assembly (EISA) at acidic condition, and DNA molecules were covalently bound to these mesoporous substrates. These prepared materials were characterized by TEM, AFM, FT-IR and Laser Scanning Confocal Fluorescence Microscopy (LSCFM). The ordered mesoporous structure and highly dense covalent bonds help to increase...