Institute of Macromolecular Chemistry, the National Academy of Sciences of Ukraine, Kyiv, Ukraine.
Zabolotny Institute of Microbiology and Virology, the National Academy of Sciences of Ukraine, Kyiv, Ukraine.
Sci Rep. 2020 Apr 28;10(1):7126. doi: 10.1038/s41598-020-64079-0.
The objective of this work is to study the peculiarities of structural organization, morphology, thermomechanical, electrical and antimicrobial properties of nanocomposites based on pectin-polyethyleneimine interpolyelectrolyte complexes and silver nanoparticles in dependence on the type of reducing agent being applied for chemical reduction of silver ions in the interpolyelectrolyte-metal complexes. The average size of Ag nanoparticles is shown to be increased with decreasing of the activity of reducing agent (E) and equals to 3.8 nm, 4.3 nm, and 15.8 nm, respectively, when engaging sodium borohydride (-1.24 V), hydrazine (-1.15 V) and ascorbic acid (-0.35 V). Moreover, it was found that the crystallite size of Ag nanoparticles also had the smallest value for nanocomposites obtained involving NaBH as reducing agent. Ag-containing nanocomposites prepared by reduction of silver ions in interpolyelectrolyte-metal complexes while applying a range of reducing agents are characterized by different electrical properties and polymer matrix' glass transition temperature. The influence of silver nanoparticles' size incorporated in the polymer matrix on the antimicrobial activity of nanocomposites has been established. The inhibition zone diameter of Staphylococcus aureus and Escherichia coli was higher for nanocomposites obtained using sodium borohydride and hydrazine compared to nanocomposites where ascorbic acid was used as the reducing agent.
这项工作的目的是研究基于果胶-聚乙烯亚胺互聚物复合物和银纳米粒子的纳米复合材料的结构组织、形态、热机械、电和抗菌性能的特性，这些特性取决于所应用的还原剂的类型，用于在互聚物-金属配合物中化学还原银离子。结果表明，随着还原剂（E）活性的降低，Ag 纳米粒子的平均尺寸增大，当使用硼氢化钠（-1.24 V）、水合肼（-1.15 V）和抗坏血酸（-0.35 V）作为还原剂时，Ag 纳米粒子的平均尺寸分别为 3.8nm、4.3nm 和 15.8nm。此外，还发现当使用硼氢化钠作为还原剂时，Ag 纳米粒子的晶粒尺寸对于互聚物-金属配合物中银离子还原得到的纳米复合材料也具有最小的值。使用一系列还原剂还原互聚物-金属配合物中的银离子制备的含银纳米复合材料具有不同的电性能和聚合物基质的玻璃化转变温度。已经确定了掺入聚合物基质中的银纳米粒子的尺寸对纳米复合材料抗菌活性的影响。与使用抗坏血酸作为还原剂的纳米复合材料相比，使用硼氢化钠和水合肼作为还原剂制备的纳米复合材料对金黄色葡萄球菌和大肠杆菌的抑制圈直径更高。
