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Preparation And Characterization Of Rare Earth Activated Antibacterial Nonwovens By Magnetron Sputtering

Posted on:2009-11-03Degree:MasterType:Thesis
Country:ChinaCandidate:X Y ZhaoFull Text:PDF
GTID:2121360272456622Subject:Textile Engineering
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As the most-watched inorganic antibacterial, TiO2 photocatalysis material makes use of mainly brightness under ultraviolet 387.5 nm, which has restricted its usage range greatly. Some methods were employed to enhance the efficiency of TiO2 based photocatalysis and extend the range of excitation light wavelength, such as metal ion doping, semiconductor compounding and so on.In this paper, classification of the antibacterial finishing agents and techniques employed for the preparation of the nanostructured antibacterial textiles home and abroad were first introduced. For there was limit existing in the range of excitation light wavelength, in this research, magnetron sputter coating which was friendly to the environments was used to deposit nanostructured both rare earth Nd and TiO2 on polyester (PET) nonwovens at room temperature to obtain the rare earth enabled TiO2 antibacterial thin films. Therefore, absorption spectrum of TiO2 was widened and better antibacterial performance under visible light was conferred. In this way, the antibacterial function of surface was realized for textile materials.In this research, the impacts of sputtering parameters of Nd and TiO2 such as sputtering power, gas pressure and gas flow, deposition pattern and time on antibacterial properties of the samples were investigated. Furthermore, the effect of reaction gases in magnetron sputtering on antibacterial properties was also studied. The antibacterial performance was assessed using shake flask test. The surface morphology was observed with AFM. The crystal structure were characterized by X-ray Diffraction (XRD). And surface elemental distribution and quantitative analysis were measured employing inductively couple plasma spectrometry (ICP). The ultraviolet-visible light spectrum, hygienic safty, compatibility of the thin film and substrate, antibacterial stability were also investigated and analyzed.The antibacterial test results revealed that deposited by the pattern of TiO2/Nd/TiO2 , the bactericidal performance was improved greatly by mixing a certain amount of rare earth Nd in TiO2 nanostructured film. Within the scale of experiment, antibacterial performance was improved as the content of rare earth Nd increased. When the sputtering time ratio of TiO2/Nd is 10, the rare earth enabled TiO2 thin film acquired the best antibacterial performance. By the further added content of rare earth Nd, the antibacterial performance of sample was decreased.As the sputtering time prolonged, the antibacterial perfomances improved gradually and stabled after 60min. Meanwhile using O2 as the reaction gas in the magnetron sputtering also enhanced the antibacteial performances. However sputtering power, gas pressure and gas flow had slight influences on antibacterial properties.AFM, XRD and ICP analysises indicated that a better crystallinity anatase TiO2 was obtained in the rare earth enabled TiO2 thin film. The nano-structured film sputtered on the PET nonwoven was made up of especially small nano-sized particles which were coated continuously. As the transition element, the rare earth Nd that doped in TiO2 thin film could induce lattice distortion, charge capture and particle refining, which are the major reasons to improve the antibacteial properties.
Keywords/Search Tags:Magnetron sputter coating, TiO2, Nd, Rare earth enabled, Nanostructured film, Antibacterial, PET nonwovens
PDF Full Text Request
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