Immobilizing silver nanoparticles onto the surface of magnetic silica composite to prepare magnetic disinfectant with enhanced stability and antibacterial activity

Zhang, Xiaole; Niu, Hongyun; Yan, Jinping; Cai, Yaqi

doi:10.1016/j.colsurfa.2010.12.009

Cited by 109 publications

(53 citation statements)

References 28 publications

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“…Wang et al reported uniform orange-like Fe 3 O 4 /polypyrrole (PPy) composite microspheres with excellent Cr(VI) ion removal properties . Zhang et al successfully synthesized Fe 3 O 4 \SiO 2 \Ag composite and investigated its potential application as an antibacterial material in water disinfection (Zhang et al 2011). Gan et al had developed Fe 3 O 4 @C@Au composite microspheres with superior SERS detection and recyclable catalytic degradation abilities for organic dyes (Gan et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Fabrication of cube-like Fe3O4@SiO2@Ag nanocomposites with high SERS activity and their application in pesticide detection

Zhao

Wang

et al. 2016

J Nanopart Res

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The cube-like Fe 3 O 4 @SiO 2 @Ag (FSA) nanocomposites with great SERS activity have been successfully synthesized by a layer-by-layer procedure in this paper. The cube-like Fe 3 O 4 @SiO 2 coreshell structures were prepared via a new route and Ag nanoparticles were introduced onto their surface through a one-pot hydrothermal reaction. By controlling the reaction time, the coverage rate of Ag on the FSA surface could be tuned, and then a series of FSA composites were obtained. The SERS properties of these FSA composites were investigated using paminothiophenol (p-ATP) as the probe molecule. It was found that the FSA composites synthesized with a reaction time of 6 h showed the best SERS performance, and the detection limit for p-ATP could reach 1 9 10 -7 M. For practical application, the FSA composites were also used to detect thiram, one of the dithiocarbamate fungicides that has been widely used as a pesticide in agriculture. The detection limit is as low as 1 9 10 -6 M (0.24 ppm), lower than the maximal residue limit of 7 ppm in fruit prescribed by the US Environmental Protection Agency. The resulting substrate with high SERS activity, stability and strong magnetic responsivity makes the FSA composite a perfect choice for practical SERS detection applications.

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Section: Introductionmentioning

confidence: 99%

Fabrication of cube-like Fe3O4@SiO2@Ag nanocomposites with high SERS activity and their application in pesticide detection

Zhao

Wang

et al. 2016

J Nanopart Res

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“…Nanoantimicrobials were proved as an effective solution for the prevention of pathogenic microorganisms [2]. Over the past decades, various nanosized antibacterial agents such as metal, carbon, and metal oxide nanoparticles have been studied for potential in effective treatment of pathogenic microorganisms [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Decoration of Silver Nanoparticles on Multiwalled Carbon Nanotubes: Antibacterial Mechanism and Ultrastructural Analysis

Dinh

Quy

Huy

et al. 2015

Journal of Nanomaterials

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Recently, development of carbon nanocomposites composed of carbon nanostructures and metal nanoparticles has attracted much interests because of their large potential for technological applications such as catalyst, sensor, biomedicine, and disinfection. In this work, we established a simple chemistry method to synthesize multiwalled carbon nanotubes (MWCNTs) decorated with silver nanoparticles (Ag-NPs) using a modified photochemical reaction (Tollens process). The formation and interaction of Ag-NPs with functionalized groups on the surface of MWCNTs were analyzed by X-ray diffraction, transmission electron microscopy, Raman spectroscopy, and Fourier-transform infrared spectroscopy. The average size of Ag-NPs on the MWCNTs was approximately ∼7 nm with nearly uniform size distribution. Antibacterial effect of Ag-MWCNTs nanocomposites was evaluated against two pathogenic bacteria including Gram-negative Escherichia Coli and Gram-positive Staphylococcus aureus bacteria. Interaction and bactericidal mechanism of Ag-MWCNTs with tested bacteria was studied by adapting the electron microscopy. Analysis on ultrastructural changes of bacterial cells indicates that antibacterial action mechanism of Ag-MWCNTs is physical interaction with cell membrane, the large formation of cell-Ag-MWCNTs aggregates, and faster destructibility of cell membrane and disruption of membrane function, hence resulting in cells death.

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“…The Ag NPs are very small, which makes it difficult to eliminate them completely by centrifugation or filtration, and high concentrations of residual nanosilver in solution can cause potential adverse health effects. 18 Third, Ag-based nanomaterials exhibit inferior activity against Gram-positive bacterial pathogens compared with that against Gram-negative bacteria; this phenomenon could be attributed to the thicker and more stable membrane of the former than that of the latter. This feature prevents the Ag ions from entering into the bacterium.…”

Section: Introductionmentioning

confidence: 99%

Vancomycin-modified Fe3O4@SiO2@Ag microflowers as effective antimicrobial agents

Wang

Zhang²,

Zhou³

et al. 2017

IJN

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Nanomaterials combined with antibiotics exhibit synergistic effects and have gained increasing interest as promising antimicrobial agents. In this study, vancomycin-modified magnetic-based silver microflowers (Van/Fe 3 O 4 @SiO 2 @Ag microflowers) were rationally designed and prepared to achieve strong bactericidal ability, a wide antimicrobial spectrum, and good recyclability. High-performance Fe 3 O 4 @SiO 2 @Ag microflowers served as a multifunction-supporting matrix and exhibited sufficient magnetic response property due to their 200 nm Fe 3 O 4 core. The microflowers also possessed a highly branched flower-like Ag shell that provided a large surface area for effective Ag ion release and bacterial contact. The modified-vancomycin layer was effectively bound to the cell wall of bacteria to increase the permeability of the cell membrane and facilitate the entry of the Ag ions into the bacterium, resulting in cell death. As such, the fabricated Van/Fe 3 O 4 @SiO 2 @Ag microflowers were predicted to be an effective and environment-friendly antibacterial agent. This hypothesis was verified through sterilization of Gram-negative Escherichia coli and Gram-positive methicillin-resistant Staphylococcus aureus , with minimum inhibitory concentrations of 10 and 20 μg mL −1 , respectively. The microflowers also showed enhanced effect compared with bare Fe 3 O 4 @SiO 2 @Ag microflowers and free-form vancomycin, confirming the synergistic effects of the combination of the two components. Moreover, the antimicrobial effect was maintained at more than 90% after five cycling assays, indicating the high stability of the product. These findings reveal that Van/Fe 3 O 4 @SiO 2 @Ag microflowers exhibit promising applications in the antibacterial fields.

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Immobilizing silver nanoparticles onto the surface of magnetic silica composite to prepare magnetic disinfectant with enhanced stability and antibacterial activity

Cited by 109 publications

References 28 publications

Fabrication of cube-like Fe3O4@SiO2@Ag nanocomposites with high SERS activity and their application in pesticide detection

Fabrication of cube-like Fe3O4@SiO2@Ag nanocomposites with high SERS activity and their application in pesticide detection

Decoration of Silver Nanoparticles on Multiwalled Carbon Nanotubes: Antibacterial Mechanism and Ultrastructural Analysis

Vancomycin-modified Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@Ag microflowers as effective antimicrobial agents

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