Synthesis of Stable Dispersions of Water-Soluble and Sers-Active Silver Nanoparticles Using Pam

Xiong, Jing; Xue, Qunji; Wu, Xuedong

doi:10.1142/s179329201350046x

Cited by 4 publications

(6 citation statements)

References 41 publications

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“…The UV absorption below 400 nm is significantly enhanced but the peak is not clearly observed. The results agree with the pH effect reported by Xiong et al (2013) that the higher absorbance was observed with increasing pH. The TEM image links this slight blue shift in the UV-vis spectrum to the reduction in particle size.…”

Section: Effect Of Phsupporting

confidence: 92%

“…3(b)-(d) confirm the largest size of nanoparticles from the synthesis using the highest AgNO 3 concentration of 0.5 M (A9). Redshifts were previously observed in Ag nanoparticles synthesized with increased AgNO 3 concentrations (Baláž et al, 2019;Dragan et al, 2018;Tolouietabar et al, 2020;Xiong et al, 2013). However, the intensity of the peak is substantially reduced suggesting that the nanoparticle concentration is decreased.…”

Section: Effect Of Agno 3 Concentrationmentioning

confidence: 60%

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Effects of synthesis conditions and storage on silver nanospheres chemically reduced by mulberry leaf extracts

Pholnak¹,

Khunsare²,

Sirisathitkul³

et al. 2021

JART

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Silver (Ag) nanospheres were chemically reduced from 1 mM silver nitrate (AgNO3) solutions using mulberry (Morus alba Linn.) leaf extracts. The increase of pH in the synthesis from 9 to 13 modified the surface plasmon resonance peak in UV-Vis spectra relating to the particle diameter around 20 nm. Smaller nanoparticles were obtained from the syntheses at pH 7.4-7.7 and their density was slightly increased with the increase in synthesis temperature from 25 °C to 90 °C. The particle size was increased with increasing AgNO3 concentration from 0.1 to 0.5 M but the mixed phases were obtained from the 0.5 M AgNO3 precursor. After storing for 10 months at room temperature, the nanosuspensions remained without Ag sediment but their colors had significantly changed due to particle agglomerations. The colors were characterized by the smartphone colorimetry according to the RGB, CIE space, as well as chroma and hue angle. Based on the chroma and CIE b* values, the effect of synthesis pH in the stored nanosuspensions was comparable to that before the storage. Although the temperature had only moderate effects, nanosuspensions synthesized at 25 °C, 80 °C, and 90 °C were clearly distinguished by the hue and CIE b* values.

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Section: Effect Of Phsupporting

confidence: 92%

Section: Effect Of Agno 3 Concentrationmentioning

confidence: 60%

Effects of synthesis conditions and storage on silver nanospheres chemically reduced by mulberry leaf extracts

Pholnak¹,

Khunsare²,

Sirisathitkul³

et al. 2021

JART

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show abstract

“…AgNPs can be prepared by a variety of methods such as thermal decomposition, 27 microemulsion, 28 sol-gel, 29 green synthesis using microbes, 30 thermal, radiation and chemical reduction methods, 27,[31][32][33][34] etc. Reduction in the presence of a mild reducing agent is the most promising approach for the synthesis of AgNPs .…”

Section: Synthesis Of Silver Nanoparticlesmentioning

confidence: 99%

Antibacterial activities of silver nanoparticles and antibiotic-adsorbed silver nanoparticles against biorecycling microbes

Khurana

Vala

Andhariya

et al. 2014

Environ. Sci.: Processes Impacts

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Silver nanoparticles have a huge share in nanotechnology based products used in clinical and hygiene products. Silver nanoparticles leaching from these medical and domestic products will eventually enter terrestrial ecosystems and will interact with the microbes present in the land and water. These interactions could be a threat to biorecycling microbes present in the Earth's crust. The antimicrobial action towards biorecycling microbes by leached silver nanoparticles from medical waste could be many times greater compared to that of silver nanoparticles leached from other domestic products, since medical products may contain traditional antibiotics along with silver nanoparticles. In the present article, we have evaluated the antimicrobial activities of as-synthesized silver nanoparticles, antibiotics - tetracycline and kanamycin, and antibiotic-adsorbed silver nanoparticles. The antimicrobial action of silver nanoparticles with adsorbed antibiotics is 33-100% more profound against the biorecycling microbes B. subtilis and Pseudomonas compared to the antibacterial action of silver nanoparticles of the same concentration. This study indicates that there is an immediate and urgent need for well-defined protocols for environmental exposure to silver nanoparticles, as the use of silver nanoparticles in nanotechnology based products is poorly restricted.

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“…Ag, Au, Cu, Pt, Ti, and Pd NPs). This could be achieved using chemical reducing agents, such as ethylene glycol [12,13], hydrazine hydrate [14,15], and glucose [16], in the presence of PAAm as a capping (a stabilizing agent). The hydrothermal technique, another oldest technique, was defined by Roy [17] as the synthesis of NPs from a component of solid phases, involving water as a catalyst and at occasional instances where the synthesis reaction was conducted at elevated temperature (>100 °C) and pressure (>1 atm) [17].…”

Section: Introductionmentioning

confidence: 99%

Comparative catalytic reduction of 4-nitrophenol by polyacrylamide-gold nanocomposite synthesized by hydrothermal autoclaving and conventional heating routes

Salaheldin

2017

Adv. Nat. Sci: Nanosci. Nanotechnol.

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Gold nanoparticles (AuNPs) in polymeric polyacrylamide (PAAm) matrix were synthesized using conventional heating and autoclaving thermal techniques. The synthesized Au/PAAm nanocomposite was characterized using UV–vis spectroscopy and high-resolution transmission electron microscopy. The size of the synthesized particles was approximately 6.37 nm and 8.19 nm with the conventional heating and autoclaving thermal techniques, respectively. Electron diffraction x-ray spectroscopy and the Fourier transformation infrared spectroscopy were used for the composition and elemental studies, which confirmed that the Au metallic atoms were synthesized and embedded within a PAAm matrix via a coordination bond between the carbonyl (–CONH2) group and the metallic NPs. X-ray diffraction confirmed the crystalline nature of the fabricated AuNPs with face centered cubic of nanocrystals. The catalytic activity of the as-prepared Au/PAAm nanocomposite for the reduction of 4-nitrophenol to 4-aminophenol was studied in the presence of sodium borohydrate. The synthesized AuNPs had an effective catalytic activity; the smaller NPs synthesized NPs with the conventional heating technique had a higher reaction kinetic rate in comparation with those synthesized with the autoclaving technique. Therefore, the Au/PAAm nanocomposite can be widely used as an eco-friendly, non-toxic, a fast and cost-effective product to remove versatile organic pollutants such as aromatic nitro compounds.

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Synthesis of Stable Dispersions of Water-Soluble and Sers-Active Silver Nanoparticles Using Pam

Cited by 4 publications

References 41 publications

Effects of synthesis conditions and storage on silver nanospheres chemically reduced by mulberry leaf extracts

Effects of synthesis conditions and storage on silver nanospheres chemically reduced by mulberry leaf extracts

Antibacterial activities of silver nanoparticles and antibiotic-adsorbed silver nanoparticles against biorecycling microbes

Comparative catalytic reduction of 4-nitrophenol by polyacrylamide-gold nanocomposite synthesized by hydrothermal autoclaving and conventional heating routes

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