期刊
LANGMUIR
卷 34, 期 48, 页码 14537-14545出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.8b03061
关键词
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资金
- Natural Science Foundation of China [51873222, 51473179, 81773483, 41576098]
- Natural Science Foundation of Zhejiang Province, China [LY13E010004]
- Fujian province-Chinese Academy of Sciences STS project [2017T31010024]
- Youth Innovation Promotion Association of Chinese Academy of Science [2016268]
In this work, we synthesize dodecyl mercaptan-functionalized silver nanoparticles integrated with polypropylene nanocomposite (DM-AgNPs/PP) substrates by a simple in situ melt blending method. The formation and distribution of AgNPs are confirmed by UV-visible spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy, and thermogravimetric analysis. The existence of DM-AgNPs in PP film substrate enhances the thermal degradation and crystallization properties. Further, the antimicrobial activity of as-synthesized DM-AgNPs/PP film substrate is studied using Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria as model microbes, which displayed significantly enhanced bacteriostatic activities under optimized composition and experimental conditions. Interestingly, PP substrate with 0.4% DM-AgNPs exhibits drastically improved antibacterial property via the release of oxygen reactive species and Ag ion diffusion processes; thus, the inhibition rates of E. coli and S. aureus are obtained as 100 and 84.6%, respectively, which is higher than the conventional AgNPs. Finally, we demonstrate the migration study of Ag ions from the DM-AgNPs/PP film using different food simulant solutions by inductively coupled plasma-mass spectrometry analysis and the dissolved Ag ion content is estimated, which is a key prospect for the toxicity analysis. The overall Ag ion migration value is estimated between 1.8 and 24.5 mu g/cm(2) and displayed a lowest limit of Ag ion migration as 0.36 mu g/cm(2). Our work highlights the development of high performance nanocomposites as promising antibacterial and food simulant materials for biomedical and industrial applications.
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