Ag Nanoparticles/α-Ag2WO4 Composite Formed by Electron Beam and Femtosecond Irradiation as Potent Antifungal and Antitumor Agents

Assis, Marcelo; Robeldo, Thaiane; Foggi, Camila Cristina de; Kubo, Andressa Mayumi; Mínguez‐Vega, Gladys; Condoncillo, E.; Beltrán‐Mir, Héctor; Torres–Mendieta, Rafael; Andrés, Juán; Oliva, Mónica; Vergani, Carlos Eduardo; Barbugli, Paula Aboud; Camargo, Emerson R.; Borra, Ricardo Carneiro; Longo, Elson

doi:10.1038/s41598-019-46159-y

Cited by 51 publications

(49 citation statements)

References 84 publications

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“…Ag NPs are able to penetrate cell membranes and release Ag + ions, which have a high affinity to react with phosphorus and sulfur compounds, either from the membrane or from inside of the cell. [61] In addition, Ag NPs can generate reactive oxygen species (ROS), which cause an accumulation of intracellular ROS, leading to bacterial death from oxidative stress [62]. The halo inhibition test (AATCC 147) is only a qualitative test that shows bacterial inhibition, requiring a qualitative test to determine the percentages of inhibition (AATCC 100).…”

Section: Resultsmentioning

confidence: 99%

Ag nanoparticles-based antimicrobial polycotton fabrics to prevent the transmission and spread of SARS-CoV-2

Tremiliosi

Simões

Minozzi

et al. 2020

Preprint

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Pathogens (bacteria, fungus and virus) are becoming a potential threat to the health of human beings and environment worldwide. They widely exist in the environment, with characteristics of variety, spreading quickly and easily causing adverse reactions. In this work, an Ag-based material is used to be incorporated and functionalized in polycotton fabrics using pad-dry-cure method. This composite proved to be effective for inhibiting the SARS-CoV-2 virus, decreasing the number of replicates in 99.99% after an incubation period of 2 minutes. In addition, it caused 99.99% inhibition of the pathogens S. aureus, E. coli and C. albicans, preventing cross-infections and does not cause allergies or photoirritation processes, demonstrating the safety of its use.

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Section: Resultsmentioning

confidence: 99%

Ag nanoparticles-based antimicrobial polycotton fabrics to prevent the transmission and spread of SARS-CoV-2

Tremiliosi

Simões

Minozzi

et al. 2020

Preprint

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“…When they are immobilized on semiconductor surfaces have gained importance because they exhibit increased stability and high surface areas, which enhance the local field energy under visible light excitation through the SPR effect to promote the dual capability of adsorption and photocatalysis when compared with their corresponding single‐component materials. In particular, Ag nanoparticles is a good choice for surface modification because the price of Ag is much lower than those of Au, or even Pt, and Pd, and have exceptional optical, electronic, catalytic, and antibacterial properties . Active materials decorated with Ag nanoparticles have shown superior performance in terms of their increased conductivity, catalytic activity, and sensing properties .…”

Section: Introductionmentioning

confidence: 99%

Ag Nanoparticles/AgX (X=Cl, Br and I) Composites with Enhanced Photocatalytic Activity and Low Toxicological Effects

et al. 2020

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Periodic structures induced by electron irradiation are a unique phenomenon when electron beams irradiate on the surface of some materials. These periodic structures have potential for technological applications. However, the fuzzy nature of the electron-induced structuring hinders its further exploration in such applications. In this paper, novel Ag nanoparticle/AgX (X=Cl, Br and I) composites, with enhanced photocatalytic activity and low toxicological effects, were prepared, for the first time, using electron beam irradiation. The remarkable advantage of this approach is that the Ag nanoparticles/AgX composites can be easily prepared in one-step without the need for high-pressure conditions, surfactants, ionic liquids, or reducing agents. Furthermore, our method does not involve any toxic substances, which makes the as-synthesized samples highly applicable for technological applications. The structure, morphology and physicochemical properties of the Ag nanoparticles/AgX composites were studied using various characterization techniques. Using first-principles calculations based on density functional theory and the quantum theory of atoms in molecules, we reveal how the concentration of excess electrons in the AgX materials induces the formation of the Ag nanoparticles under electron beam irradiation. These results extend the fundamental understanding of the atomic process underlying the mechanism of AgÀ X bond rupture observed during the transformation induced via electron irradiation of the AgX crystals by increasing the total number of electrons in the bulk structure. Thus, our findings provide viable guidance for the realization of new materials for the degradation of contaminated wastewater with low toxicity.

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“…It should be pointed out that from our simulations, the adsorption of dye occurs with ZrO 2 /MWCNT which form hydrogen bonds and weak van der Waals interactions (Verlicchi & Ghirardini 2019). The XRD and SEM characterization provides fundamental evidence of the high yield and purity of composite preparation (Dagar & Narula 2017;Assis et al 2019). UV-visible spectroscopy, the EDS test, and DLS are accurate, convenient, and rapid characterization tools for monitoring the adsorption and pollution removal process in aqueous systems (Kassem et al 2019;Higashiwaki & Fujita 2020;Kharlamova & Eder 2020).…”

Section: Introductionmentioning

confidence: 66%

Photo-catalytic dye degradation of methylene blue by using ZrO2/MWCNT nanocomposites

Gangadhar

Ramesh

Jagadish

et al. 2021

Water Practice and Technology

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Photocatalytic degradation of the dyes was deliberated by altering the catalyst and dye concentrations. The Zirconium oxide/Multiwall carbon nanotube (ZrO2/MWCNT) catalyst was facilely synthesized by a hydrothermal synthesis method. The nanocomposite ZrO2/MWCNT was formed in hydrothermal condition 95 °C of low growth temperature. The physico-chemical properties were successfully characterized using X-ray diffraction, (XRD) Scanning Electron Microscope (SEM), Energy dispersive Spectroscopy (EDS), Dynamic light scattering (DLS) analysis, X-ray photoelectron spectroscopy (XPS). The presence of Orbicular shaped ZrO2 nanocrystallines and Multiwall carbon nanotube was characterized by XRD pattern shows the presence of ZrO2 and MWCNT with the 2θ peaks at 19.62, 22.5 & 30.2. The thermal behavior of the ZrO2/MWCNT partials was also investigated by differential thermal analysis, and their vibrational bands were identified by infrared spectroscopy. The photo catalytic degradation of methylene blue in industrial wastewater was observed under UV light irradiation using the synthesized ZrO2/MWCNT as catalyst. The results revealed that the ZrO2/MWCNT nanoparticles exhibited high degeneration with COD and TOC reducing from 241 mg/L and 148.00 mg/L to 2.34 mg/L and 1.26 mg/L respectively with the efficiency of 90–94% over 25–60 min duration of UV irradiation time. In comparison with the pristine Zirconium Oxide and MWCNT, the composite ZrO2/MWCNT nanoparticles exhibited more efficient, the durable and stable photo-catalytic activity during experiments.

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Ag Nanoparticles/α-Ag2WO4 Composite Formed by Electron Beam and Femtosecond Irradiation as Potent Antifungal and Antitumor Agents

Cited by 51 publications

References 84 publications

Ag nanoparticles-based antimicrobial polycotton fabrics to prevent the transmission and spread of SARS-CoV-2

Ag nanoparticles-based antimicrobial polycotton fabrics to prevent the transmission and spread of SARS-CoV-2

Ag Nanoparticles/AgX (X=Cl, Br and I) Composites with Enhanced Photocatalytic Activity and Low Toxicological Effects

Photo-catalytic dye degradation of methylene blue by using ZrO2/MWCNT nanocomposites

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