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首页> 美国卫生研究院文献>Nanoscale Research Letters >Plant-Mediated Synthesis of Silver Nanoparticles and Their Stabilization by Wet Stirred Media Milling
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Plant-Mediated Synthesis of Silver Nanoparticles and Their Stabilization by Wet Stirred Media Milling

机译：植物介导的纳米银的合成及其通过湿式搅拌介质研磨的稳定性

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Within this study, a stable nanosuspension of silver nanoparticles (Ag NPs) was prepared using a two-step synthesis and stabilization approach. The Ag NPs were synthesized from a silver nitrate solution using the Origanum vulgare L. plant extract as the reducing agent. The formation of nanoparticles was finished upon 15 min, and subsequently, stabilization by polyvinylpyrrolidone (PVP) using wet stirred media milling was applied. UV-Vis spectra have shown a maximum at 445 nm, corresponding to the formation of spherical Ag NPs. Infrared spectroscopy was used to examine the interaction between Ag NPs and the capping agents. TEM study has shown the formation of Ag NPs with two different average sizes (38 ± 10 nm and 7 ± 3 nm) after the plant-mediated synthesis, both randomly distributed within the organic matrix. During milling in PVP, the clusters of Ag NPs were destroyed, the Ag NPs were fractionized and embedded in PVP. The nanosuspensions of PVP-capped Ag NPs were stable for more than 26 weeks, whereas for the non-stabilized nanosuspensions, only short-term stability for about 1 week was documented.
机译：在这项研究中，使用两步合成和稳定化方法制备了稳定的银纳米颗粒（Ag NPs）纳米悬浮液。使用牛至属植物提取物作为还原剂，由硝酸银溶液合成了Ag NP。 15分钟后完成纳米颗粒的形成，随后使用湿式搅拌介质研磨通过聚乙烯吡咯烷酮（PVP）进行稳定化处理。 UV-Vis光谱显示在445 nm处有最大值，对应于球形Ag NP的形成。红外光谱用于检查银纳米颗粒和封端剂之间的相互作用。 TEM研究表明，在植物介导的合成后，形成了具有两种不同平均尺寸（38±10 nm和7±3 nm）的Ag NP，它们均随机分布在有机基质中。在PVP研磨过程中，Ag NP的簇被破坏，Ag NP被分离并包埋在PVP中。 PVP封端的Ag NPs的纳米悬浮液稳定超过26周，而未稳定的纳米悬浮液仅记录了约1周的短期稳定性。

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