Transition of TiO₂ in TiO₂/Vermiculite Nanocomposites  

作　　者：LUO Li-ming PENG Tong-jiang SUN Hong-juan 

机构地区：[1]Institute of Materials Science and Engineering,SWUST [2]Institute of Mineral Materials & Application,SWUST

出　　处：《矿物学报》2013年第S1期65-65,共1页Acta Mineralogica Sinica

摘　　要：The TiO2/vermiculite composites were prepared by in-situ hydrolyzing reaction and in-situ dehydrating reaction of tetrabutyl titanate-hexadecyl trimethyl ammonium bromide intercalated vermiculite. The structural phase transition of TiO2 in TiO2/vermiculite composites calcined at different temperatures was characterized by using XRD and Raman. The results show that at calcination temperature of 800℃ appeared the anatase phase of TiO2 in TiO2/vermiculite nanocomposites, while pure TiO2 is all converted to rutile at the same temperature. The average crystal size of TiO2 in TiO2/vermiculite nanocomposites and pure TiO2 both increase with the calcination temperature. The average grain size of TiO2 in TiO2/vermiculite nanocomposites is less than that of pure TiO2 at the same calcination temperature. The results also show that the silicon-oxygen structure in layered vermiculite structure can effectively depress the phase transformation from anatase to rutile, thus enhancing the transition temperature and inhibitting the growth of anatase crystals.The TiO2/vermiculite composites were prepared by in-situ hydrolyzing reaction and in-situ dehydrating reaction of tetrabutyl titanate-hexadecyl trimethyl ammonium bromide intercalated vermiculite. The structural phase transition of TiO2 in TiO2/vermiculite composites calcined at different temperatures was characterized by using XRD and Raman. The results show that at calcination temperature of 800℃ appeared the anatase phase of TiO2 in TiO2/vermiculite nanocomposites, while pure TiO2 is all converted to rutile at the same temperature. The average crystal size of TiO2 in TiO2/vermiculite nanocomposites and pure TiO2 both increase with the calcination temperature. The average grain size of TiO2 in TiO2/vermiculite nanocomposites is less than that of pure TiO2 at the same calcination temperature. The results also show that the silicon-oxygen structure in layered vermiculite structure can effectively depress the phase transformation from anatase to rutile, thus enhancing the transition temperature and inhibitting the growth of anatase crystals.

关 键 词：VERMICULITE TiO2 ANATASE RUTILE structural phase TRANSITION 

分 类 号：TB33[一般工业技术—材料科学与工程]