Preparation And Assembly Of Functional Materials

As an important component of the functional material, hollow materials and vanadium rare-earth luminescence materials are applied with a great value.Hollow nanostructures have been one of the research frontier. They have the advantages of low density,high specific surface area,thermal stability,monodispersity,good compatibilities with other materials and different material can be combined into the hollow interiors et al. So they play an important role in our life.Such as delivery vehicle of drugs,efficient catalyst,photonic building and the reactor of the nanoparticles.The vanadium rare-earth luminescence materials have their stable luminous efficiency illuminated by vacuum ultraviolet and successfully applied in the field of PDP and FED .With the development of the nanotechnology , the vanadium rare-earth luminescence materials will step into a new step development phase.In this paper, porous silica , hollow materials and rare-earth luminescence materials were prepared via acid etching method , hydrothermal synthesis and solvothermal method , and by applying various characterizing methods, such as XRD, TEM, SEM, TGA, EDS et al. Some experiments are discussed about the reaction mechanism. The main contents were as follows:1 Well dispersed porous silica spheres were prepared via acid etching method .The reaction conditions were as follows: SiO2 as the template ,HF aqueous solution, PVP as the surfactant The products were characterized by means of transmission electron microscopy(TEM) ,Fourier transform infrared(FTIR)and DTA/TGA.The reaction mechanism was also explored.2 Hydrothermal method has been employed to fabricated hollow-structure SiO2:Ln materials. This experiment's innovation is that the hollow materials are prepared under acidic condition, which is different from the report in the literature of alkaline condition. We also studied impact of the particles prepared in the condition ,the reaction temperature and the concentration of Ln3+ were the important influencing factors. The structure of the proucts was characterized by TEM , HRTEM, SEM, XRD.The optical properties of Eu-doped fluorescent silica were also characterized by flourence.Due to the porousness in the surface of the silica, the drug releasing and loading behaviors of hollow silica. were also studied.Through the testing ,the resuluts indicated that the hollow silica has high storage capacities and favorable drug released behavior.It is important that the properties of the drugs were not changed in the loading and released process.The synthesized hollow silica has potential for controlled drug IBU deliverty.3 The YVO4 : Eu were prepared under the solvothermal condition using the DMF as the solvent which can decrease the rate of the hydrolysis rate of Re salts.so that the reaction process can be controlled easily. Through optimizing the reaction conditions, monodispersed YVO4:Eu spheres were obtained and the reaction process were explored.,pH and reaction time were also discussed, the YVO4:Eu spheres diameters were about 30nm. The structure was characterized by TEM, SEM, and so on.