silver oxide nanoparticles
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Fuel ◽  
2022 ◽  
Vol 310 ◽  
pp. 122296
Author(s):  
Rozina ◽  
Mushtaq Ahmad ◽  
Saira Asif ◽  
Jiří Jaromír Klemeš ◽  
Muhammad Mubashir ◽  
...  

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 527
Author(s):  
Denis N. Chausov ◽  
Veronika V. Smirnova ◽  
Dmitriy E. Burmistrov ◽  
Ruslan M. Sarimov ◽  
Alexander D. Kurilov ◽  
...  

Microbial antibiotic resistance is an important global world health problem. Recently, an interest in nanoparticles (NPs) of silver oxides as compounds with antibacterial potential has significantly increased. From a practical point of view, composites of silver oxide NPs and biocompatible material are of interest. A borosiloxane (BS) can be used as one such material. A composite material combining BS and silver oxide NPs has been synthesized. Composites containing BS have adjustable viscoelastic properties. The silver oxide NPs synthesized by laser ablation have a size of ~65 nm (half-width 60 nm) and an elemental composition of Ag2O. The synthesized material exhibits strong bacteriostatic properties against E. coli at a concentration of nanoparticles of silver oxide more than 0.01%. The bacteriostatic effect depends on the silver oxide NPs concentration in the matrix. The BS/silver oxide NPs have no cytotoxic effect on a eukaryotic cell culture when the concentration of nanoparticles of silver oxide is less than 0.1%. The use of the resulting composite based on BS and silver oxide NPs as a reusable dry disinfectant is due to its low toxicity and bacteriostatic activity and its characteristics are not inferior to the medical alloy nitinol.


2021 ◽  
Vol 2114 (1) ◽  
pp. 012071
Author(s):  
Hussien. A. Yassien ◽  
Najwa J. Jubier

Abstract In this research, mechanical properties (hardness, impact strength, comparison strength) and thermal conductivity are examined for PMMA/polypropylene fiber composites reinforced with a different weight fraction of Ag2O nanoparticles (0%,0.05%,0.1%,0.15%,0.2%,0.25 and 0.3%). Samples prepared by Hand Lay-Up Moulding method at room temperature according to the international standard dimensions for each test, results showed a noticeable improvement in the values of mechanical properties and thermal conductivity with increasing the weight fraction of the silver oxide nanoparticles.


Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6915
Author(s):  
Veronika V. Smirnova ◽  
Denis N. Chausov ◽  
Dmitriy A. Serov ◽  
Valery A. Kozlov ◽  
Petr I. Ivashkin ◽  
...  

A method for obtaining a stable colloidal solution of silver oxide nanoparticles has been developed using laser ablation. The method allows one to obtain nanoparticles with a monomodal size distribution and a concentration of more than 108 nanoparticles per mL. On the basis of the obtained nanoparticles and the PLGA polymer, a nanocomposite material was manufactured. The manufacturing technology allows one to obtain a nanocomposite material without significant defects. Nanoparticles are not evenly distributed in the material and form domains in the composite. Reactive oxygen species (hydrogen peroxide and hydroxyl radical) are intensively generated on the surfaces of the nanocomposite. Additionally, on the surface of the composite material, an intensive formation of protein long-lived active forms is observed. The ELISA method was used to demonstrate the generation of 8-oxoguanine in DNA on the developed nanocomposite material. It was found that the multiplication of microorganisms on the developed nanocomposite material is significantly decreased. At the same time, the nanocomposite does not inhibit proliferation of mammalian cells. The developed nanocomposite material can be used as an affordable and non-toxic nanomaterial to create bacteriostatic coatings that are safe for humans.


Author(s):  
Mubin Mustafa Kiyani ◽  
Nurain Baig Moghul ◽  
Ambreen Javed ◽  
Maisra Azhar Butt ◽  
Hassan Burair Abbas ◽  
...  

2021 ◽  
Author(s):  
Manon Mani Vellingiri ◽  
Mithu Ashwin John Kennedy ◽  
Parimala Gnana Soundari Arockiam Jeyasundar ◽  
Swamiappan Sathiskumar ◽  
Ulaganathan Priyadharshini ◽  
...  

Abstract The present study focused to synthesize the silver oxide nanoparticles (AgONPs) from endophytic fungus, as the strain eventually possess the medicinal property acquired from the medicinal tree, Aegle marmelos. About 35 pigmented endophytic fungi were isolated, screened for antagonistic activity against 12 clinical human pathogens and antioxidant activity through DPPH radical scavenging assay; among the isolates, FC36AY1 explored the highest activity. The endophytic fungus was identified as Aspergillus terreus FC36AY1 through microscopic and Internal Transcribed Spacer (ITS) 1, ITS 4 and 18S rRNA amplification. The AgONPs were synthesized from the strain FC36AY1 and characterized for its confirmation, functional groups, nanostructures with unit cell dimensions, size and shape, presence of elements through UV-Vis spectrophotometry, FT-IR, X-Ray Diffraction, Scanning Electron Microscopic with EDX analysis. The myco-generated AgONPs manifested their antimicrobial and antioxidant properties with maximum activity at minimum concentration. Moreover, the inhibition of angiogenesis by the AgONPs in Hen’s Egg Test on the Chorio-Allantoic Membrane analysis evinced significant bioactivity at least concentration. Thus the results of this investigation revealed that this bioactive fungal mediated AgONPs can be exploited as potential in biomedical applications.


2021 ◽  
Vol 16 (3) ◽  
pp. 651-660
Author(s):  
Brahim El-Ghmari ◽  
Hanane Farah ◽  
Abdellah Ech-Chahad

In this paper, a facile and green approach for the synthesis of silver oxide nanoparticles Ag2O NPs was performed using the extract of the wild plant Herniaria hirsuta (H. hirsuta). Different spectral methods were used for the characterization of the biosynthesized Ag2O NPs, ultraviolet-visible (UV-Vis) spectroscopy gave a surface plasmon resonance (SPR) peak of Ag2O NPs is 430 nm, estimation of direct and indirect forbidden gap bands are respectively 3.76 eV and 3.68 eV; Fourier transform infrared (FTIR) spectral analysis revealed the groups responsible for the stability and synthesis of Ag2O NPs. The morphology of Ag2O NPs was studied by scanning electron microscopy (SEM) showing a nearly spherical shape of Ag2O NPs, and X-ray diffraction (XRD) study confirmed the crystallinity of Ag2O NPs with a crystallinity size of 15.51 nm. The catalytic activity of Ag2O NPs, as well as the rings number were studied by the degradation of methylene blue dye. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).


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