Synthesis of silver nanoparticles embedded on silica by gamma irradiation for utilization as antimicrobial agents
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Abstract
Silver nanoparticles deposited on silica (Ag nano/SiO2) have been prepared by Co-60 gamma irradiation of the mixture Ag+/SiO2/H2O/ethanol. The reduction of Ag+ in the suspension of SiO2 is brought by e-aq and H· generated during the radiolysis of water/ethanol solution. The presence of SiO2 prevents agglomeration of Ag clusters. The conversion dose (Ag+® Ag0) was determined by UV-Vis spectroscopy. Transmission electron microscopy (TEM) characterized the size of Ag nanoparticles. As a result, the particle sizes were determined to be in the range of 5-20 nm for an Ag+ concentration of 5 mM. The crystal structure of silver nanoparticles was also investigated by X-ray diffraction (XRD). In addition, the antifungal activity of Ag nano/SiO2 was tested against Aspergillus niger var Tieghn by plate count method. The results indicated that the antifungal efficiency of Ag nano/SiO2 was about 64, 71, 81, 82, and 96% at the concentrations of Ag nanoparticles of 30, 50, 70, 100, and 150 ppm, respectively.通过伽马辐照合成嵌入二氧化硅的银纳米粒子，以用作抗菌剂
通过 Co-60 伽马辐照 Ag+/SiO2/H2O/ethanol 混合物，制备了沉积在二氧化硅上的银纳米粒子（Ag nano/SiO2）。Ag+ 在二氧化硅悬浮液中的还原是由水/乙醇溶液放射性分解过程中产生的 e-aq 和 H- 引起的。二氧化硅的存在可防止银簇聚集。转换剂量（Ag+® Ag0）是通过紫外可见光谱测定的。透射电子显微镜（TEM）确定了银纳米颗粒的尺寸。结果表明，当 Ag+ 浓度为 5 mM 时，颗粒大小在 5-20 nm 之间。银纳米粒子的晶体结构也通过 X 射线衍射（XRD）进行了研究。此外，还通过平板计数法测试了纳米银/二氧化硅对黑曲霉变种 Tieghn 的抗真菌活性。结果表明，在 Ag 纳米粒子的浓度分别为 30、50、70、100 和 150 ppm 时，Ag 纳米/SiO2 的抗真菌效率分别为 64%、71%、81%、82% 和 96%。
本文章由计算机程序翻译，如有差异，请以英文原文为准。
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