Nano-Particale Preparation of Rare Earth Oxide by Laser Vapor Condensation and the Antibacterial Characteristics Research

Abstract: In this article,CeO2 particles was well prepared by laser heating gas-evaporation method with a 100W CW CO2 laser as light source and Ce2(CO3)3 as targets. The effects on products of process reaction parameters have been well researched. Measurements such as XRD, TEM were used to characterize the superfine particles. The results show that many parameters such as laser power density, reaction pressure, sort and rate of airflows affect the sizes and crystal system of nano-particles. The size of the particle is between 50-80 nm in Ar atmosphere, and 10-20 nm in deoxidization atmosphere H2.Antibacterial activity of ZnO-CeO2 solid nano-powders was studied by measuring the change of sterilization efficacy to the bacterial. ZnO-CeO2 nano-particles were prepared by Laser Vapor Condensation (LVC) with oxygen as loading gas. The size of the particle can be affected greatly by some reacting conditions such as the flow of loading gas and the reacting pressure. Rod-like powders with different molar ratios (Zn/Ce) and sizes were produced in the changed reacting conditions for studing the effects of sterilization efficacy to the bacterial. It was found that antibacterial activity of oxide powders increase with decreasing particle size and increasing ceria concentration. The changes of antibacterial action for S. aureus were similar to those for B.niger. Both the preparing mechanism of LVC and the sterilization assumption were proposed in this paper…
Key words: Cerium dioxide; Nano-particles; Antibacterial activity; ZnO-CeO_2; Laser chemistry

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