Synthesis And Property Characterization Of Rare Earth Complex Nano Antibacterial Material

Spreading of harmful bacteria is threatening critically our life andmanufacture. With science development and life level improvment, ourrequirements to health and sanitation are higher than that before. It is animportant key that harmful bacteria birth and breed are controlled and killed.The main carriers of antibacterial materials containing silvers are claymineral like montmorillonite, zeolite. The inorganic antibacterial agents thathave low stability, limited life can't be smashed to nanograde and conform tothe norm of new antibacterial function material. As a carrier, BaTiO₃ has manyparticular properties, such as, good physical and chemical stability andspecial characterization, long life, non-harm, sustaining the high temperature,convenient, low synthsis temperature and little partical. Furthermore, there arebetter antibacterial properties when it was doped with some Ag⁺,La³⁺.Ag-doped nano-BaTiO₃ powder and rare earth complex nano-BaTiO₃powder are prepared by Sol-gel method using Ba(CH₃COO)₂,Ti(O_C4H₉)₄,La₂O₃ and AgNO₃ as raw materials. Ag-doped nano-BaTiO₃ powder thatn_Ba:n_Ag is 1:0.05 is calcinated 2 hours at temperature 800 ℃ and pH 3.5. Rareearth complex nano-BaTiO₃ powder adding PEG as the surface-active agent iscalcinated 3 hours at temperature 850℃ and pH4.5. The amount of Ag⁺,La³⁺doped in BaTiO₃is 0.100 in rare earth complex nano-BaTiO₃ powder. Thesample microcrystalline analysed with SEM and particle analysis techniqueshow that the mean particle diameters are 65nm～70nm and areperovskite-type structure of cubic system. Chemical complex of Ag⁺,La³⁺,Ba²⁺ and Ti⁴⁺ characterized by AAS and ICP-AES is the same with the theory.The results with DTA show that freewater, PEG, Hac and n-C4H9OH evaporateunder 320℃. Organic compounds oxidate and precursors of the samplesdecoposite between 320～500℃. The results show that Ag-doped nano-BaTiO3powder has distinctive antibacterial activities to Staphylocouus aureusand,Escherichia coi and Pseudomonas aeruginosa. The antibacterial activities ofrare earth complex sample (nBa:nAg=1:0.030) are the best. The antibacterialactivities of rare earth complex nano-BaTiO3 powder are better than Ag-dopednano-BaTiO3 powder.