Agafonov A.V.

MECHANOCHEMICAL SYNTHESIS OF CALCIUM TITANATE AND RESEARCH OF ITS PHOTOCATALYTIC ACTIVITY

Recently much attention is paid to the synthesis and study of the properties of inor-ganic materials, based on alkaline earth titanates with a perovskite structure that have vari-ous polymorphic forms depending on the temperature. Calcium titatanat (CaTiO3) can be se-lected from the variety of perovskites because of its relatively high dielectric constant, unique photochemical properties, chemical stability, and compatibility with biological tissues, which leads to its application in microelectronics, photocatalysis and biomedicine as bone implants. In this paper, a solid-phase synthesis of calcium titanate was carried out by ceramic technol-ogy using mechanochemistry methods. This method allows to obtain calcium titanate directly by mechanochemical activation from the initial mixture of Ca (OH)2 and TiO2, which signifi-cantly reduces the energy consumption for its production.

2016, Т. 59, № 6, Стр. 83-88

SOLUTION METHOD FOR PRODUCTION OF OPTICALLY ACTIVE MULTILAYER TITANIUM DIOXIDE -NANOSILVER COATINGS ONTO POLYETHER SUBSTRATE

Photochromic multilayer TiO2/Ag/TiO2 coating was prepared on plastic PET substrate using a solution method. The titanium dioxide sol was successfully produced using the titanium tetraisopropoxide as precursor and the nitric acid as peptizing agent via the low-temperature sol-gel synthesis in aqueous medium. Titanium dioxide films were prepared by a sol-gel dip coating method from a colloid solution of nanocrystalline TiO2 sol. Thus, nanocrystalline tita-nium dioxide sol and an aqueous solution of silver complex [Ag(NH3)2]NO3 followed by a pho-tolysis for the reduction of silver ions to Ag nanoparticles with a plasmon resonance have been alternately deposited layer-by-layer. In result, heterostructures possessing photochromic prop-erties were formed. The TiO2/Ag/TiO2 coating was investigated by UV-Vis spectroscopy, X-ray diffraction and atomic force microscope (AFM) with different resolutions.

2016, Т. 59, № 6, Стр. 78‒82
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