Preparation, morphology, and antibacterial properties of polyacrylonitrile/montmorillonite/silver nanocomposites
Preparation, morphology, and antibacterial properties of polyacrylonitrile/montmorillonite/silver nanocomposites
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DOI：
10.1016/j.matchemphys.2012.07.034
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发表时间：
2012-10-15
影响因子：
4.6
通讯作者：
Ma, Te-Wei
中科院分区：
文献类型：
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作者：
Hwang, Jiunn-Jer;Ma, Te-Wei
采用聚丙烯腈（PAN）插层改性蒙脱土，然后与硝酸银反应。片状粘土具有负电荷和大的表面积，是银离子的分散剂。利用3%NaBH 4还原Ag+（原位）制备了一系列聚丙烯腈/蒙脱土/银纳米复合材料（PAN/o-MMT/Ag）。通过X射线衍射和扫描电镜观察证实了银粒子的存在，其直径为50 - 100 nm。在38.2度、44.4度、64.6度和77.6度处获得XRD衍射峰。利用AFM和TEM对复合材料的表面粗糙度和银纳米粒子（AgNPs）在复合材料中的分散性进行了表征。加入o-MMT使纳米复合材料变得粗糙。AgNP主要位于层状硅酸盐纳米填料中。此外，通过粒度分析仪和原子吸收光谱仪证实了纳米复合材料中的银释放到水中，银在水中以纳米颗粒的形式存在。PAN/3 wt.%的较高F值（F = [AgNO 3/CH 2CH（CN）]，其为盐与PAN重复单元的摩尔比）o-MMT/Ag纳米复合材料对应于更大的平均粒径和更多的AgNPs在2 wt.% AgNPs溶液。采用纸片扩散法研究了PAN/o-MMT/Ag纳米复合薄膜在蒸馏水中浸泡后的AgNPs溶液的杀菌性能。结果显示，AgNPs溶液不抑制丝状真菌的生长，但对革兰氏（+）金黄色葡萄球菌、革兰氏（+）大肠杆菌和肺炎克雷伯氏菌的微小细菌非常有效。特别地，使用2 wt.通过将PAN/3 wt.% o-MMT/Ag纳米复合材料（F = 0.20）在蒸馏水中24 h对细菌的抑制效果最好（16.4 mm）。在蒸馏水中浸泡30天，抑菌圈直径为13.0- 13.6mm，第4次浸泡后抑菌圈直径大于10 mm。(C)2012 Elsevier B. V.保留所有权利。
Modified montmorillonite was intercalated with polyacrylonitrile (PAN) and then reacted with AgNO3. Plate-like clay, with anionic charges and a large surface area, was the dispersant of the silver ions. Aqueous 3% NaBH4-reduced Ag+ (in situ) was utilized to prepare a series of polyacrylonitriie/montmorillonite/silver nanocomposites (PAN/o-MMT/Ag). The presence of silver particles with diameters of 50 -100 nm was confirmed by X-ray and SEM observations. XRD diffraction peaks were obtained at 38.2 degrees, 44.4 degrees, 64.6 degrees and 77.6 degrees. AFM and TEM were used to evaluate the surface roughness of the nanocomposites and the dispersion of the silver nanoparticles (AgNPs) therein nanocomposites. Adding o-MMT made the nanocomposites rougher. The AgNPs were primarily located in the layered silicate nanofiller. In addition, the silver in nanocomposites was released to the water and dominant form of silver was nanoparticle in the water was verified by particle size analyzer and atomic absorption spectrometer. A higher F value (F = [AgNO3/CH2CH(CN)], which was the molar ratio of the salt to the PAN repeat unit) of the PAN/3 wt.% o-MMT/Ag nanocomposites corresponded to larger average particle size and more AgNPs in the 2 wt.% AgNPs solution. The bactericidal property of AgNPs solution, which was obtained by soaking PAN/o-MMT/Ag nanocomposite films in distilled water, was evaluated by the paper disc diffusion method. The results revealed that the AgNPs solution did not inhibit the growth of filamentous fungi but was quite effective against tiny bacteria of Gram ( +) Staphylococcus aureus, Gram () Escherichia coli and Klebsiella pneumonia. In particular, using a 2 wt.% AgNP solution that was obtained by soaking PAN/3 wt.% o-MMT/Ag nanocomposite (F = 0.20) for 24 h in distilled water showed the most effectively inhibited growth of bacteria (16.4 mm). Its antibacterial activity still remained, yielding an inhibition zone with a diameter of 13.0-13.6 mm for 30 days in distilled water, and yielding an inhibition zone with a diameter over 10 mm after fourth submersions in distilled water. (C) 2012 Elsevier B.V. All rights reserved.