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In recent years , mesoporous materials due to its excellent performance has become a hotspot of research and development in catalysis, adsorption and separation , drug delivery and other applications in the field of prospects it concern . This paper studies the sol - gel preparation evenly distributed , the shape of the rules of mesoporous silica and modified , the nature of the study modified mesoporous silica composite . Tetraethyl orthosilicate (TEOS) as the silicon source , cetyl trimethyl ammonium bromide (CTAB) as a template, in the alcohol-water system , synthesized under alkaline conditions, a homogeneous distribution of spherical shaped dioxide mesoporous silicon (Si02), through a series of characterization means mesoporous silica characterization; while the preparation of the mesoporous silica as a carrier , the metallic silver (Ag) particles in the mesoporous silica doped load change the study modified composite structure of new properties and applications . The main contents are as follows : (1) under basic conditions to the cationic surfactant cetyltrimethylammonium bromide (CTAB) as a template to prepare a distribution uniform , regular shape of the spherical mesoporous silica using X - ray diffraction (XRD), surface area analyzer (BET), thermal gravimetric analysis (TG), scanning electron microscopy ( SEM ) , transmission electron microscopy (TEM) and other means of prepared mesoporous silica nanoparticles were characterized . ( 2) of surfactants , alcohols , calcination temperature of mesoporous formation process , explain the formation mechanism of the sol - gel prepared spherical mesoporous SiO2 , and came to the preparation of regular shape , evenly distributed mesoporous Si02 ball optimal conditions . (3) the preparation of the mesoporous silica balls as carrier , by direct and indirect synthesis method of the silver load to the pores and surface of the ball of the mesoporous silica , to give a silver loading type mesoporous silica , comparisons of best preparation method , and modified after the formation of the Ag-SiO2 characterization. (4) the metallic Ag modified mesoporous SiO2 antibacterial experiments to study its antibacterial effect on Escherichia coli , the results show having antibacterial effect over the nano- silver (Ag) , preliminary experiments describes modified Ag-SiO2 antibacterial mechanism .
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