Synthesis And Properties Of Perovskite Structure Nanomaterials

Due to its unique of optics, electricity and magnetism performance, perovskite MTiO3(M=Ba, Sr, Ca) structure nanomaterials have been paid more attentions for biological and ceramic materials in a wide range of applications. This paper focused on the preparation, characterization and testing of perovskite MTiO3(M=Ba, Sr, Ca) structure nanomaterials, porous tetragonal BaTiO3ceramic material. We explored the morphology of the preparation of micro/nano material experiment conditions, biocompatibility of MTiO3and the mechanism of the porous tetragonal BaTiO3ceramic material. X-ray diffraction (XRD), Scanning electron microscopy(SEM) and Transmission electron microscopy (TEM) were systematically studied on the as-obtained nanostructure materials. The results were as follows:1.Perovskite MTiO3structure nanomaterials were successfully synthesized on Ti foil by a simple hydrothermal method.First, we prepared the porous three-dimensional titanate nanowire bioscaffold which possesses of highly ductility, specific surface, good mechanical behaviour and excellently permeability. Then MTiO3incorporated titanate nanowire into the MTiO3nanoparticles modified titanate nanowire bioscaffold was prepared by hydrothermal method.The phase composition and morphology of the as-obtained products were characterized by X-ray diffraction, field emission scanning electron microscopy and high resolution transmission electron microscopy. The effects of reaction time, reaction temperature and alkaline concentration were studied.Moreover, two types of formation process were proposed to elucidate the growth mechanism of MTiO3structure nanomaterials.Based on the images and biochemical assays of the MG63cells proliferation and differentiation, the biocompatibility and bioactivity of titanate nanowire@BaTiO3,titanate nanowire@SrTiO3and CaTiO3were systematically investigated.2. Porous tetragonal BaTiO3ceramic was successfully prepared by a combination of hydrothermal and low-temperature-sintering method. The hollow TiO2@BaCO3as the sintering precursor was synthesized via a simple hydrothermal method, and then porous BaTiO3was generated by calcining the hollow TiO2@BaCO3precursor at900℃without additive.The hollow TiO2@BaCO3structure plays two important roles in the preparing of the porous BaTiO3ceramic. First, the TiO2@BaCO3hollow structure provides high surface areas and increases the contact points between BaCO3and TiC2, which can reduce the sintering temperature of the BaTiO3ceramic. On the other hand, the cavity of the ordered arranged TiO2@BaCCO3hollow sphere shows important influence on the porous structure, and the pore size of the as-prepared porous BaTiO3ceramic can be tuned from several nm to hundreds nm by changing the sintering temperature.The formation mechanism of the porous BaTiO3ceramic was proposed.