Abstract In order to study the antimicrobial effect of silver - titanium bimetallic nano-materials, in this study, through the preparation of TiO2 particles, then using the photoprecipitation method, TiO2/Ag composite materials are synthesized, and finally the core-shell structure of TiO2-Ag nano-composite materials are prepared. The prepared nano-materials are characterized and analyzed. Common Escherichia coli and Staphylococcus aureus are used to evaluate their antimicrobial properties. The results show that there is a maximum absorption peak at 335 nm for TiO2 particles, and the ultraviolet absorption spectra of TiO2/Ag composites and core-shell structure of TiO2-Ag nano-composites change unevenly. The stability of core-shell nano-composites of TiO2-Ag is good and its optical properties are better than expected. The appearance characterization of the prepared nano-materials is analyzed. It is found that the appearance of the prepared nano-materials is basically uniform, and the Ag ions in the core-shell structure of the nano-composites are well dispersed, uniform in size and ideal in effect. In X-ray diffraction analysis, it is found that there are four additional peaks in the TiO2/Ag composite and core-shell structure of the TiO2-Ag nano-composites compared with the TiO2. This is due to the fusion of Ag particles and the fact that Ag particles are not oxidized in the process of ultraviolet irradiation. In the analysis of the antimicrobial properties of the prepared nano-materials, it is found that the antimicrobial effect is most obvious when the reaction time is 45 min, the reaction temperature is 20 °C and the pH of the system is 6. Therefore, through this study, it is found that the antibacterial properties of nano-materials prepared by silver-titanium bimetallic fusion have obvious effect, which reaches the expectation of this study. Although there are some shortcomings in the research process, it still provides experimental basis for the later period of nano-materials with antimicrobial properties, and has important research significance.

中文翻译：

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银钛双金属纳米材料的抗菌作用

摘要 为研究银钛双金属纳米材料的抗菌作用，本研究通过制备TiO2颗粒，然后采用光沉淀法合成TiO2/Ag复合材料，最终得到其核壳结构。制备了TiO2-Ag纳米复合材料。对制备的纳米材料进行表征和分析。常见的大肠杆菌和金黄色葡萄球菌用于评估它们的抗菌特性。结果表明，TiO2颗粒在335nm处有一个最大吸收峰，TiO2/Ag复合材料的紫外吸收光谱和TiO2-Ag纳米复合材料的核壳结构变化不均匀。TiO2-Ag核壳纳米复合材料稳定性好，光学性能好于预期。分析了制备的纳米材料的外观表征。发现所制备的纳米材料外观基本均匀，纳米复合材料核壳结构中的Ag离子分散良好，尺寸均匀，效果理想。在X射线衍射分析中发现，与TiO2相比，TiO2-Ag纳米复合材料的TiO2/Ag复合材料和核壳结构中多了四个峰。这是由于银颗粒的融合以及银颗粒在紫外线照射过程中没有被氧化的事实。对制备的纳米材料的抗菌性能进行分析发现，反应时间为45 min，反应温度为20℃，体系pH为6时，抗菌效果最为明显。因此，通过本研究发现，银钛双金属融合制备的纳米材料的抗菌性能效果明显，达到了本研究的预期。虽然在研究过程中存在一些不足，但仍为后期研制具有抗菌性能的纳米材料提供了实验依据，具有重要的研究意义。