Chemical synthesis of silver nanoparticles

Aragaw, Belete Asefa; Alula, Melisew Tadele; Majoni, Stephen; King’ondu, Cecil K.

doi:10.1016/b978-0-12-824508-8.00017-4

Cited by 3 publications

(1 citation statement)

References 120 publications

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“…The chemical method is more effective to prepare AgNPs than the physical methods due to their controllable size and shape, and long-term stability in water. However, the chemical method for the synthesis of AgNPs requires the use of stabilizing and reducing agents such as sodium citrate, ascorbate, and sodium borohydride, which are hazardous chemicals [2,3]. In order to overcome this problem, cellulose is promising as a reducing agent because of the large amounts of hydroxyl groups, which can interact with silver metal to synthesize AgNPs.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Silver Nanoparticles Deposited on TEMPO-Oxidized Cellulose Nanofibers

Phaonoeng,

Tanpichai,

Boonmahitthisud

2024

SSP

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Silver nanoparticles (AgNPs) were synthesized by a chemical method in which cellulose nanofibers (CNFs) extracted from pineapple leaves served as a stabilizing and reducing agent. In this study, pineapple leaves were oxidized by the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation with sodium hypochlorite (NaClO) to obtain CNFs. After the oxidation, the transformation from hydroxyl groups to carboxylate groups of cellulose was confirmed by Fourier-transform infrared spectroscopy (FTIR), and TEMPO-oxidized CNFs with a higher carboxylate content were obtained. Then, TEMPO-oxidized CNFs with a carboxylate content of 2.49 mmol/g and non-oxidized CNFs with a carboxylate content of 0.68 mmol/g were used as a reducing agent to synthesize AgNPs. The formation of AgNPs was confirmed by color changes of the Ag solutions from white to yellow. Furthermore, AgNPs with an average diameter of 76.5 ± 22.15 nm were obtained when TEMPO-oxidized CNFs were used as a reducing agent, while non-oxidized CNFs generated AgNPs with a larger particle size of 181.2 ± 66.16 nm. This suggested that the TEMPO-oxidized CNFs could be used as a stabilizing and reducing agent for the synthesis of AgNPs with smaller diameters.

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Section: Introductionmentioning

confidence: 99%

Preparation of Silver Nanoparticles Deposited on TEMPO-Oxidized Cellulose Nanofibers

Phaonoeng,

Tanpichai,

Boonmahitthisud

2024

SSP

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Study of the properties of nanocomposites based on thermally-treated-polyacrylonitrile (review)

Козлов

Костишин²,

Ситнов³

et al. 2022

Zavod. lab., Diagn. mater.

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Organic semiconductors and novel carbon forms (fullerene, carbon nanotubes, carbon foam, graphene) promote synthesis of carbon nanocomposites with modified properties based on thermally treated polyacrylonitrile (TPAN) that comprises curved (spherical, ring-like, and tube-like) carbon planes. Here we present a review of the studies regarding the properties of TPAN-based nanocomposites. The features of the IR irradiation procedure with a synergetic effect and the mechanism of polyacrylonitrile (PAN) transformation into carbon nanocrystalline material (CNM) have been analyzed. The developed method is promising for the synthesis of luminescent carbon nanostructures and biocompatible carbon nanostructures with high sensitivity to pH medium; metal-polymer nanocomposites (Ag/PAN, Cu/PAN, Fe3O4/TPAN), which can be used in electronics, catalysis, and in water purification from heavy metals, etc. The results obtained may be used to synthesize TPAN-based novel nanocomposites with modified properties.

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Facile Green Synthesis of Silver Nanoparticles Using Aqueous Leaf Extract of Origanum majorana with Potential Bioactivity against Multidrug Resistant Bacterial Strains

et al. 2022

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The high prevalence of nosocomial bacterial resistance contributes to significant mortality and morbidity around the world; thus, finding novel antibacterial agents is of vital concern. Accordingly, the present study attempted to synthesize silver nanoparticles (AgNPs) using a green approach. Aqueous leaf extract of Origanum majorana was used to synthesize AgNPs and the antibacterial efficiency against multidrug resistant bacterial strains was detected. Characterization of the biogenic AgNPs was performed using ultraviolet-visible spectrophotometry (UV-Vis), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FT-IR) analysis, and X-ray diffraction analysis (XRD). The disc diffusion method was used to detect the antibacterial activity of AgNPs against three nosocomial multidrug-resistant strains. Preliminary UV-Vis analysis revealed the biosynthesis of AgNPs due to peak formation at 374 nm, corresponding to the surface plasmon resonance (SPR) of biogenic AgNPs. TEM micrographs detected the synthesis of small AgNPs with an average particle size of 26.63 nm. EDX analysis revealed the presence of the following elements: oxygen (3.69%), carbon (2.93%), aluminum (1.29), silicon (2.83%), chloride (17.89%), and silver (71.37%). Furthermore, XRD analysis revealed the presence of diffraction peaks at 2 theta (θ) degrees of 38.18°, 44.36°, 64.35°, and 77.54°, assigned to the planes of silver crystals (111), (200), (220), and (311), respectively. Collectively, these findings affirm the synthesis of biogenic AgNPs with potential physicochemical characteristics. The antimicrobial efficiency of the biogenic AgNPs indicated that Klebsiella pneumoniae strain was the most susceptible strain at concentrations of 50 and 100 µg/disk, with inhibitory zones of 21.57 and 24.56 mm, respectively. The minimum inhibitory concentration (MIC) of AgNPs against Klebsiella pneumoniae strain was found to be 10 µg/mL, while the minimum bactericidal concentration (MBC) was found to be 20 µg/mL. In conclusion, aqueous leaf extract of O. majorana mediated synthesis of small sized AgNPs, with potential antimicrobial effectiveness against multidrug-resistant bacterial pathogens.

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Chemical synthesis of silver nanoparticles

Cited by 3 publications

References 120 publications

Preparation of Silver Nanoparticles Deposited on TEMPO-Oxidized Cellulose Nanofibers

Preparation of Silver Nanoparticles Deposited on TEMPO-Oxidized Cellulose Nanofibers

Study of the properties of nanocomposites based on thermally-treated-polyacrylonitrile (review)

Facile Green Synthesis of Silver Nanoparticles Using Aqueous Leaf Extract of Origanum majorana with Potential Bioactivity against Multidrug Resistant Bacterial Strains

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