Role of a cystine-based Gemini surfactant ligand in the synthesis of catalytic active silver nanoparticles

Torres, María Andrea Molina; Gómez, Emma Laura Alfaro; Fernández, Mariana A.; Veglia, Alicia V.; Pacioni, Natalia L.

doi:10.1016/j.molliq.2019.03.168

Cited by 13 publications

(2 citation statements)

References 38 publications

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“…A feature to notice is the emergence of a double band at 500 cm −1 in the case of AgCys NPs and a sharp band at 480 cm −1 in the case of CuCys NPs, where free cysteine and AuCys NPs do not present any relevant peaks (Figure 3a). Bands between 512 and 520 cm −1 have been previously identified as stretching vibrations belonging to the S−S bond formed in cystine 10,15,21,61 that do not exclude molecular interaction with the metal surface through the thiol group, argumenting the S−S bond being tilted against the NP surface and interacting through electron lone pairs without sulfide bridge cleavage. 10 More recent results demonstrate that the S−S band vanishes after prolonged sample incubation, 15 an effect that is attributed to kinetic and thermodynamic reasons.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Interaction Mechanisms and Interface Configuration of Cysteine Adsorbed on Gold, Silver, and Copper Nanoparticles

et al. 2022

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Cysteine-protected metal nanoparticles (NPs) have shown interesting physicochemical properties of potential utility in biomedical applications and in the understanding of protein folding. Herein, cysteine interaction with gold, silver, and copper NPs is characterized by Raman spectroscopy and density functional theory calculations to elucidate the molecular conformation and adsorption sites for each metal. The experimental analysis of Raman spectra upon adsorption with respect to free cysteine indicates that while the C−S bond and carboxyl group are similarly affected by adsorption on the three metal NPs, the amino group is sterically influenced by the electronegativity of each metal, causing a greater modification in the case of gold NPs. A theoretical approach that takes into consideration intermolecular interactions using two cysteine molecules is proposed using a S−metal−S interface motif anchored to the metal surface. These interactions generate the stabilization of an organo−metallic complex that combines gauche (P H ) and anti (P C ) rotameric conformers of cysteine on the surface of all three metals. Similarities between the calculated Raman spectra and experimental data confirm the thiol and carboxyl as adsorption groups for gold, silver, and copper NPs and suggest the formation of monomeric "staple motifs" that have been found in the protecting monolayer of atomic-precise thiolatecapped metal nanoclusters.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Interaction Mechanisms and Interface Configuration of Cysteine Adsorbed on Gold, Silver, and Copper Nanoparticles

et al. 2022

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“…The accurate determination of their concentration is one of the most critical parameters, mainly because nanoparticles (NP) are frequently obtained with a certain degree of polydispersity, 39 indeed when it is possible to get highly uniform NP, for example, nanospheres. 40,41 A few publications discuss this major challenge in nanoscience, focusing on polydispersity. 42,43 However, the calculation of NP concentration in multi-shape samples remains generally underestimated due to overlooking each shape's contribution to the total NP concentration.…”

Section: Introductionmentioning

confidence: 99%

MultiShapeC, an algorithm to assess concentration in multi-shape nanoparticle samples: nanosilver, a case study

2022

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Citrus sinensis peel waste assisted synthesis of AgNPs: effect of surfactant on the nucleation and morphology

2020

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Silver nanoparticles (AgNPs) were synthesized by using Citrus sinensis peel waste extract. Optical images and UV-visible spectroscopy reveals the appearance of yellow to brown-red color and surface plasmon resonance (SPR) band at 400-480 nm, respectively, due to the formation of AgNPs. The stable perfect transparent silver sols were formed in presence of cetyltrimethylammonium bromide (CTAB). The brownish precipitates appeared with sodium dodecyl sulphate (SDS) after 3 h. The nucleation, position of SPR band and intensity depends on the head group nature of cationic and anionic micelles of SDS and CTAB. The as-prepared AgNPs were characterized using conventional techniques such as Fouriertransform infra-red, energy dispersed X-ray detector, scanning electron microscope, transmission electron microscope, and X-ray diffractometer. Zeta potential of CTAB-AgNPs was calculated and found to be stable for ca. 1 week. Molar concentration (3.3 × 10 −4 mol/L) and aggregation number (607,339.917) of DPE-AgNPs were calculated. Ascorbic acid, citric acid and total reducing sugars were estimated in dry and fresh peel extract. Gram positive Staphylococcus aureus and Gram-negative Escherichia coli bacteria shows excellent antibacterial activities toward DPE-AgNPs.

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Role of a cystine-based Gemini surfactant ligand in the synthesis of catalytic active silver nanoparticles

Cited by 13 publications

References 38 publications

Interaction Mechanisms and Interface Configuration of Cysteine Adsorbed on Gold, Silver, and Copper Nanoparticles

Interaction Mechanisms and Interface Configuration of Cysteine Adsorbed on Gold, Silver, and Copper Nanoparticles

MultiShapeC, an algorithm to assess concentration in multi-shape nanoparticle samples: nanosilver, a case study

Citrus sinensis peel waste assisted synthesis of AgNPs: effect of surfactant on the nucleation and morphology

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