Mechanistic and kinetic study of the formation of silver nanoparticles by reduction of silver(I) in the presence of surfactants and macromolecules

Ismail, Iqbal Mohammad Ibrahim; Ewais, Hassan A.

doi:10.1007/s11243-015-9926-1

Cited by 9 publications

(8 citation statements)

References 30 publications

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“…Therefore, it can be assumed that in reaction mixture all silver cations formed coordination complexes with chitosan macromolecules and the rate of silver nanoparticles formation did not depend on the concentration of the reagents. It is worth noting that authors [ 49 ] observed the similar data. They showed that in the presence of chitosan in the reaction media, the reduction of Ag + by galactose carried out very slowly and the “absorbance‐time” dependence of Ag nanoparticles formation was also a straight line.…”

Section: Resultssupporting

confidence: 76%

“…They showed that in the presence of chitosan in the reaction media, the reduction of Ag + by galactose carried out very slowly and the “absorbance‐time” dependence of Ag nanoparticles formation was also a straight line. [ 49 ] As the reaction temperature increased from 60 to 95°C, the rate constant for CS20 enhanced by an almost one order of magnitude: from 0.0019 to 0.012. The reaction rate in the case of CS30 was slower compared to CS20 and the rate constant enhanced from 0.0001 to 0.002 with increasing temperature from 60 to 95°C.…”

Section: Resultsmentioning

confidence: 99%

“…For kinetic characterization of CS-Ag NPs formation, the absorbance at SPR band maximum was plotted versus reaction time (Figure 2). This approach has also been previously used by several authors [49,50] for the analysis of the kinetic regularities of Ag NPs formation. As can be seen in Figure 2, the dependence of the absorbance at λ max on time was fitted reasonably well (R-squared more than 0.96) by a linear approximation regardless of the reaction temperature and chitosan molecular weight.…”

Section: Effect Of Chitosan Molecular Weight On the Kinetic Of Agno 3...mentioning

confidence: 99%

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Chitosan‐capped silver nanoparticles: A comprehensive study of polymer molecular weight effect on the reaction kinetic, physicochemical properties, and synergetic antibacterial potential

et al. 2022

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The search for novel efficient antibacterial agents is attracting a great attention due to the unregulated use of common antibiotics and development of multidrugresistant bacteria strains. This paper proposes an eco-friendly approach to obtain stable chitosan-capped silver nanoparticles with controlled physicochemical and biological properties using reducing and stabilizing capacity of chitosan. The study of the influence of chitosan characteristics on the kinetic of Ag + reduction showed that an increase in polysaccharide molecular weight led to a decrease in their reducing ability. The synthesized silver nanoparticles were characterized by UV and FTIR spectroscopy, TEM, XRD, DLS. The relationships between physicochemical characteristics of the formed silver nanoparticles and the type of used chitosan, as well as synthesis temperature, were determined. It has been demonstrated that spherically-shaped (13-27 nm) and positively-charged (zeta-potential 26.1-29.5 mV) silver nanoparticles with a single symmetric SPR band at 408-418 nm are stable during 6 months in a colloidal form, and can be produced with the assistance of low-molecular weight chitosan (20-30 kDa) at 95 C. The synthesized silver nanoparticles enhanced the antibacterial activity of kanamycin and ampicillin against both gram-negative and gram-positive bacteria. These results revealed the prospects for the application of chitosan-capped silver nanoparticles to create new effective antibacterial systems (gels, films, etc).

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Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Section: Effect Of Chitosan Molecular Weight On the Kinetic Of Agno 3...mentioning

confidence: 99%

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Chitosan‐capped silver nanoparticles: A comprehensive study of polymer molecular weight effect on the reaction kinetic, physicochemical properties, and synergetic antibacterial potential

et al. 2022

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“…The first-order kinetic rate expression ( 1 ) was used to determine the values of rate constant (k) from the slope of the linear plot of versus time (t) 56 . The plots showed the highest value of slope i.e.…”

Section: Resultsmentioning

confidence: 99%

Mentha-Stabilized Silver Nanoparticles for High-Performance Colorimetric Detection of Al(III) in Aqueous Systems

Sharma

Dhillon

Kumar

2018

Sci Rep

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The present paper reports a facile and selective colorimetric method for the detection of potential environmental and health hazardous metal ions using green synthesized silver nanoparticles (AgNPs). Here the organic functional groups present in the plant extract (Mentha arvensis) are used as reductants and stabilizers in the synthesis of AgNPs. They also provide a suitable binding site to the (Al(III)) analyte in the detection mechanism. The leaf extract of Mentha arvensis was used to synthesize AgNPs at room-temperature and at 80 °C. The AgNPs synthesized at 80 °C exhibit excellent selective colorimetric detection of Al(III). The as-synthesized AgNPs have been characterized, and the synthesis, stabilization of NPs and detection mechanism has also been illustrated by using UV-vis, XPS, FTIR, TEM, EDX, SEM, AAS, and TGA analytical tools and techniques. The selectivity of detection probe was supported by the reaction between probe and metal ions followed first-order kinetics having the highest value of the regression coefficient (R2 = 0.99) for Al(III) and the analysis of thermodynamic parameters. The prepared sensor showed a lower limit of detection (LOD) of 1 nM (S/N = 3.2) in real water samples. The proposed method can be successfully utilized for the detection of Al(III) from both drinking and real water samples at the nanomolar level.

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“…AgNPs can be produced by chemical [ 22 , 23 ], physical or biological routes [ 24 , 25 ]. Biological synthesis uses clean routes, without producing toxic residues.…”

Section: Introductionmentioning

confidence: 99%

Elucidating Protein Involvement in the Stabilization of the Biogenic Silver Nanoparticles

et al. 2016

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Silver nanoparticles (AgNPs) have been broadly used as antibacterial and antiviral agents. Further, interests for green AgNP synthesis have increased in recent years and several results for AgNP biological synthesis have been reported using bacteria, fungi and plant extracts. The understanding of the role and nature of fungal proteins, their interaction with AgNPs and the subsequent stabilization of nanosilver is yet to be deeply investigated. Therefore, in an attempt to better understand biogenic AgNP stabilization with the extracellular fungal proteins and to describe these supramolecular interactions between proteins and silver nanoparticles, AgNPs, produced extracellularly by Aspergillus tubingensis—isolated as an endophytic fungus from Rizophora mangle—were characterized in order to study their physical characteristics, identify the involved proteins, and shed light into the interactions among protein-NPs by several techniques. AgNPs of around 35 nm in diameter as measured by TEM and a positive zeta potential of +8.48 mV were obtained. These AgNPs exhibited a surface plasmon resonance (SPR) band at 440 nm, indicating the nanoparticles formation, and another band at 280 nm, attributed to the electronic excitations in tryptophan, tyrosine, and/or phenylalanine residues in fungal proteins. Fungal proteins were covalently bounded to the AgNPs, mainly through S–Ag bonds due to cysteine residues (HS–) and with few N–Ag bonds from H2N– groups, as verified by Raman spectroscopy. Observed supramolecular interactions also occur by electrostatic and other protein–protein interactions. Furthermore, proteins that remain free on AgNP surface may perform hydrogen bonds with other proteins or water increasing thus the capping layer around the AgNPs and consequently expanding the hydrodynamic diameter of the particles (~264 nm, measured by DLS). FTIR results enabled us to state that proteins adsorbed to the AgNPs did not suffer relevant secondary structure alteration upon their physical interaction with the AgNPs or when covalently bonded to them. Eight proteins in the AgNP dispersion were identified by mass spectrometry analyses. All these proteins are involved in metabolic pathways of the fungus and are important for carbon, phosphorous and nitrogen uptake, and for the fungal growth. Thereby, important proteins for fungi are also involved in the formation and stabilization of the biogenic AgNPs.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1538-y) contains supplementary material, which is available to authorized users.

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Mechanistic and kinetic study of the formation of silver nanoparticles by reduction of silver(I) in the presence of surfactants and macromolecules

Cited by 9 publications

References 30 publications

Chitosan‐capped silver nanoparticles: A comprehensive study of polymer molecular weight effect on the reaction kinetic, physicochemical properties, and synergetic antibacterial potential

Chitosan‐capped silver nanoparticles: A comprehensive study of polymer molecular weight effect on the reaction kinetic, physicochemical properties, and synergetic antibacterial potential

Mentha-Stabilized Silver Nanoparticles for High-Performance Colorimetric Detection of Al(III) in Aqueous Systems

Elucidating Protein Involvement in the Stabilization of the Biogenic Silver Nanoparticles

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