A Comparison Method of Silver Nanoparticles Prepared by the Gamma Irradiation and in situ Reduction Methods

Lee, Chul Jae; Karim, Mohammad Rezaul; Vasudevan, T.; Kim, Hee Jin; Raushan, K.; Jung, Maeng Joon; Kim, Dong Yeub; Lee, Mu Sang

doi:10.5012/bkcs.2010.31.7.1993

Cited by 16 publications

(6 citation statements)

References 27 publications

(20 reference statements)

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“…UV–Vis spectrum of reaction mixture at different wavelengths ranging from 300 to 700 nm showed strong absorption peak with centering at 420 nm ( Figure 2 ) indicated the formation of Ag-NPs. This absorption is close to that seen for silver nanoparticles formed by different methods [ 31 ]. The wide absorption peak may be induced by the wide size distribution of Ag nanoparticles.…”

Section: Resultssupporting

confidence: 85%

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Biosynthesis of Silver Nanoparticles Using Brown Marine Macroalga, Sargassum Muticum Aqueous Extract

et al. 2013

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Biological synthesis of nanoparticles is a relatively new emerging field of nanotechnology which has economic and eco-friendly benefits over chemical and physical processes of synthesis. In the present work, for the first time, the brown marine algae Sargassum muticum (S. muticum) aqueous extract was used as a reducing agent for the synthesis of nanostructure silver particles (Ag-NPs). Structural, morphological and optical properties of the synthesized nanoparticles have been characterized systematically by using FTIR, XRD, TEM and UV–Vis spectroscopy. The formation of Ag-NPs was confirmed through the presence of an intense absorption peak at 420 nm using a UV–visible spectrophotometer. A TEM image showed that the particles are spherical in shape with size ranging from 5 to 15 nm. The nanoparticles were crystalline in nature. This was confirmed by the XRD pattern. From the FTIR results, it can be seen that the reduction has mostly been carried out by sulphated polysaccharides present in S. muticum.

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Section: Resultssupporting

confidence: 85%

“…This absorption is close to that seen for silver nanoparticles formed by different methods [31]. The wide absorption peak may be induced by the wide size distribution of Ag nanoparticles.…”

Section: Resultssupporting

confidence: 83%

Biosynthesis of Silver Nanoparticles Using Brown Marine Macroalga, Sargassum Muticum Aqueous Extract

et al. 2013

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“…The Raman peak at 956 cm −1 is the shifted peak of the PVP's breathing ring mode at 935 cm −1 . 45 The Raman peak at 1400 cm −1 can be interpreted as the vibration of the carbonate, 46,47 which may have been formed by the chemical interaction of Ag NPs' and PVP's C═O atomic group. The peak at 1638 cm −1 is the Raman signal that comes from PVP's carbonyl bond stretching mode.…”

Section: Crm Experimentsmentioning

confidence: 99%

Penetration of silver nanoparticles into porcine skinex vivousing fluorescence lifetime imaging microscopy, Raman microscopy, and surface-enhanced Raman scattering microscopy

et al. 2014

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In order to investigate the penetration depth of silver nanoparticles (Ag NPs) inside the skin, porcine ears treated with Ag NPs are measured by two-photon tomography with a fluorescence lifetime imaging microscopy (TPT-FLIM) technique, confocal Raman microscopy (CRM), and surface-enhanced Raman scattering (SERS) microscopy. Ag NPs are coated with poly-N-vinylpyrrolidone and dispersed in pure water solutions. After the application of Ag NPs, porcine ears are stored in the incubator for 24 h at a temperature of 37°C. The TPT-FLIM measurement results show a dramatic decrease of the Ag NPs' signal intensity from the skin surface to a depth of 4 μm. Below 4 μm, the Ag NPs' signal continues to decline, having completely disappeared at 12 to 14 μm depth. CRM shows that the penetration depth of Ag NPs is 11.1 ± 2.1 μm. The penetration depth measured with a highly sensitive SERS microscopy reaches 15.6 ± 8.3 μm. Several results obtained with SERS show that the penetration depth of Ag NPs can exceed the stratum corneum (SC) thickness, which can be explained by both penetration of trace amounts of Ag NPs through the SC barrier and by the measurements inside the hair follicle, which cannot be excluded in the experiment.

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“…In a valuable study, Lee et al (2010) compared between the in-situ reduction and γ-irradiation methods and they recorded more stability and lower average size of Ag NPs prepared by the former. Silver ions "Ag + " can be reduced by chemical, electrochemical and photochemical reduction as well as thermal, ultrasound, microwave and electron irradiation.…”

Section: Resultsmentioning

confidence: 99%

Environmentally Benign Hybrid Nanocomposite Beads for Azo Dyes Remediation via Synchronized Dual Degradation Mechanisms

Elfadl

El-Sherif

Deghiedy

2021

Preprint

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Practically, 12% of used dyes are excluded as waste in the mobile aqueous environment. Methyl orange (MO), an industrial azo dye, is known to be carcinogenic. Accordingly, this work was engaged to fabrication of a high-efficiency visible light photocatalysts based on Ag-Alginate/Chitosan-coated MgO nanocomposite beads. MgO and Ag were prepared via precipitation and γ-radiation reduction technique as a green physical one, respectively. The degradation mechanisms depended on catalytic reduction by means of sodium borohydride/Ag and photo oxidative degradation. XRD proved the periclase crystalline form of MgO of size 20 nm and the formation of face centered cubic silver crystals of size 15 nm. The degradation yield varied directly with time, MgO and dye concentration until certain limit. Five and twenty minutes were enough to get clear solution of MO (30 and 15 ppm, respectively) while 60 min was required to achieve the same target for 60 ppm MO solution. The catalysts showed high efficiency for MO of high concentration. The incorporation of Ag into catalytic beads could support both mechanisms as it could elevate the degradation efficiency up to 50% and save the time to a great extent. Thus, this carrier fruitfully converted wastewater into an effluent that can be repaid to the water cycle with minimal strike on the ecosystem.

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A Comparison Method of Silver Nanoparticles Prepared by the Gamma Irradiation and in situ Reduction Methods

Cited by 16 publications

References 27 publications

Biosynthesis of Silver Nanoparticles Using Brown Marine Macroalga, Sargassum Muticum Aqueous Extract

Biosynthesis of Silver Nanoparticles Using Brown Marine Macroalga, Sargassum Muticum Aqueous Extract

Penetration of silver nanoparticles into porcine skinex vivousing fluorescence lifetime imaging microscopy, Raman microscopy, and surface-enhanced Raman scattering microscopy

Environmentally Benign Hybrid Nanocomposite Beads for Azo Dyes Remediation via Synchronized Dual Degradation Mechanisms

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