| Bacteria,fungi and other microorganisms in the daily living environment have always threatened people's life and health.Therefore,the study of antibacterial materials is in line with the current needs of people and has a broad market and application value.The rare earth-silver composite inorganic antibacterial material prepared in this paper has good stability,antibacterial broad-spectrum,antibacterial efficiency and safety,and has a good application prospect.This study selects the sol-gel prepared Ag@Si O2,respectively investigates the silver ion concentration,p H value and reaction time on the three on the material had a greater influence on the antimicrobial effect of preparation conditions,to get the best antibacterial materials Ag@Si O2 preparation conditions for:silver ion solution concentration 7 x 10-5 mol/L,p H=6,reaction time 90 min.This is the condition in which the least amount of material is used and the antibacterial effect of up to 100%.In order to improve the antibacterial properties and stability of the materials,the properties of the materials were optimized by thermal modification and the addition of rare earth.When the roasting temperature was 400?and the concentration of rare earth ion solution was 5×10-3 mol/L,the concentration of silver ion solution could be reduced to 6×10-5 mol/L to achieve 100%antibacterial effect.Based on a variety of factors,the composite material modified by rare earth Sm was selected for application research,and the structure analysis and performance characterization of the material were carried out on its behalf.By means of SEM,XRD,XPS,ICP,BET,particle size and other detection methods,it is proved that the composite antibacterial material has the advantages of uniform particle size,good dispersion,fluffiness and amorphous structure,large pore structure and large specific surface area.The active metal elements supported by the material were elemental silver and trivalent rare earth oxides,which were consistent with the experimental design.In order to study the antibacterial mechanism of the materials,several experiments were designed and compared.According to the comprehensive judgment of the experimental results,the elemental silver can inhibit and kill bacteria through the action of ion dissolution and activation of reactive oxygen species.The addition of rare earth elements can effectively control the degeneration and discoloration of elemental silver,and help the silver element to produce more reactive oxygen species to participate in the antibacterial process and play a synergistic role in sterilization.Through the observation of living bacteria,it was found that silver element and reactive oxygen species had an obvious damaging effect on the cell wall of bacteria,leading to the change of cell wall permeability,and even the shrinkage and damage of cell wall,as well as the leakage of cell contents,leading to cell death.Finally,the antibacterial functional coating was prepared by adding antibacterial materials to the coating,and the influence of the amount of antibacterial materials on the antibacterial effect of the coating was discussed.The results showed that the antibacterial effect of the coating was 100%,and the mechanical properties and application value of the coating were not affected. |
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