Single Dispersion Of Sio <sub> 2 </ Sub> Microspheres And Micro-nano-composite Carbon Materials Preparation And Performance

Compared with the Stober method or the improved to prepare monodisperse silica spheres, the influence of small amount of surfactant additives including the addition ratio and the nature of the surfactants and different alcoholic solvents was investigated. The monodispersity silica spheres was prepared in microemulsions at a concentration of 10-4 M surfactant or upper and lower one order of magnitude. The surfactant was removed with washing of the synthesized silica nanoparticles. The structures of the different silica spheres was studied with scanning electron microscopy (SEM), X-ray diffraction (XRD) and fourier transform infrared absorption(FT-IR).Carbon/TiO2 composites were prepared via the reaction under Autogenic Pressure at Elevated Temperature (RAPET) using alkoxides as precursor, and then porous TiO2 hollow spheres were derived after removing the carbon ingredient by calcination at 600℃. The influence of surfactant additives, including the addition ratio and the nature of the surfactants, on the morphology and the structures of the Carbon/TiO2 composites and the derived TiO2 were also studied with scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-Vis diffuse reflectance spectrophotoscopy (DRS) and nitrogen adsorption-desorption measurements. The results revealed that the morphology of the products turned to spherical and then fusiform and the structures turned from hollow to solid with the increasing of surfactant additive. The BET surface area of the hollow TiO2 was modified from 12m2/g to 57m2/g after calcinations. The XRD investigation indicates that the phases of the TiO2 in both the carbon/TiO2 composites and the derived TiO2 hollow spheres are anatase.The reaction under Autogenic Pressure at Elevated Temperature (RAPET) is a new simple efficient method to prepare inorganic materials. The carbon and carbon composites were prepared via the method of RAPET using natural products such as sweet potato and coriander and the absorbent cotton and viscose fiber doped by TBOT and TEOS. The carbon and the carbon composites were studied with scanning electron microscopy (SEM), X-ray diffraction (XRD) and nitrogen adsorption-desorption measurements. The BET surface area of the materials are different from 4m2/g to 405m2/g. The XRD investigation indicates that the phases of the TiO2 in the carbon/TiO2 composites are anatase.