银纳米粒子
纳米复合材料
抗菌活性
材料科学
核化学
壳聚糖
透射电子显微镜
扫描电子显微镜
离子键合
纳米颗粒
化学工程
抗菌剂
离子
纳米技术
化学
复合材料
有机化学
细菌
生物
生物化学
工程类
遗传学
抗生素
作者
Siva Kumar Krishnan,E. Prokhorov,Montserrat Hernández‐Iturriaga,Josué D. Mota‐Morales,Milton Vázquez‐Lepe,Yuriy Kovalenko,Isaac C. Sánchez,Gabriel Luna‐Bárcenas
标识
DOI:10.1016/j.eurpolymj.2015.03.066
摘要
In the present work chitosan–silver (CS/Ag) nanocomposites, either in the form of nanoparticles (AgNP) or as ionic dendritic structures (Ag+), are synthesized by a simple and environmentally friendly in situ chemical reduction process. The antibacterial activity of the resulting nanocomposites in the form of films is studied against two bacteria, Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli. The relationship between electrical, structural and antibacterial properties of CS/AgNP and CS/Ag+ nanocomposites are studied by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction, and UV–Vis, impedance, infrared and X-ray photoelectron spectroscopies. The results demonstrate that in contrast to CS/Ag+ ion films, the CS/AgNP composites films (average particle size less than 10 nm) showed a significantly higher antibacterial potency. The collective action of AgNP and Ag+ ions facilitate the enhancement and synergetic antibacterial activity below certain critical concentration. The bactericide activity of both CS/AgNP and CS/Ag+ ion composite films increases by increasing the concentration of Ag. The composites containing 1 wt.% of silver nanoparticles and about of 2 wt.% of silver ions exhibit a maximum antibacterial activity, which is close to their electrical percolation threshold. The concentration of AgNP and Ag+ ions above the threshold level greatly diminish the antibacterial potential.
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