A novel explanation for the enhanced colloidal stability of silver nanoparticles in the presence of an oppositely charged surfactant

Skoglund, Sara; Blomberg, Eva; Wallinder, Inger Odnevall; Grillo, Isabelle; Pedersen, Jan Skov; Bergström, Magnus

doi:10.1039/c7cp04662f

Cited by 35 publications

(25 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is most probably due to the stabilization of the micellar clusters of cationic surfactants by the negatively charged silver nanoparticles. This finding is in agreement with small-angle neutron scattering and small-angle X-ray scattering measurements recently conducted [34] to explain the enhanced colloidal stability of silver nanoparticles in the presence of an oppositely charged surfactant.…”

Section: The Ctab Casesupporting

confidence: 91%

Surface‐enhanced Raman scattering as a tool to study cationic surfactants exhibiting low critical micelle concentration

Mathioudakis

Beobide

Bokias

et al. 2019

J Raman Spectroscopy

View full text Add to dashboard Cite

The collection of surface‐enhanced Raman scattering (SERS) by silver nanocolloids was used to identify the critical micelle concentration (CMC) of three cationic surfactants in 0.5‐M NaCl solutions: hexadecyltrimethylammonium bromide, dodecyltrimethylammonium bromide, and benzalkonium chloride. Despite structural similarity between the three test surfactans, differences of the shape and size of the respective micelles affected the corresponding SERS signals. The CMC values determined by this method agreed with the respective values measured by conventional methods, including fluorescence probing and electrical conductivity measurements. The potential for the application of SERS technique for low CMC determination without surface modification of silver nanoparticles by a Raman‐active molecule was also demonstrated.

show abstract

Section: The Ctab Casesupporting

confidence: 91%

Surface‐enhanced Raman scattering as a tool to study cationic surfactants exhibiting low critical micelle concentration

Mathioudakis

Beobide

Bokias

et al. 2019

J Raman Spectroscopy

View full text Add to dashboard Cite

show abstract

“…Possibly, stabilizers such as surfactants like cetyltrimethylammonium bromide (CTAB) could be introduced at higher precursor concentrations to further improve the stability and yield of the process. A positively-charged surfactant such as CTAB can create a micelle cluster in the vicinity of negatively-charged AgNPs, averting their aggregation [31]. In comparison with other precursor concentrations, the FWHM values increased considerably at 10 mM, 15 mM and 20 mM, indicating an increase in size polydispersity of the product.…”

Section: Resultsmentioning

confidence: 99%

Biosynthesis of Silver Nanoparticles Mediated by Extracellular Pigment from Talaromyces purpurogenus and Their Biomedical Applications

et al. 2019

View full text Add to dashboard Cite

In recent years, green syntheses have been researched comprehensively to develop inexpensive and eco-friendly approaches for the generation of nanoparticles. In this context, plant and microbial sources are being examined to discover potential reducing agents. This study aims to utilize an extracellular pigment produced by Talaromyces purpurogenus as a prospective reducing agent to synthesize silver nanoparticles (AgNPs). Biosynthesized AgNPs were characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS), electron probe micro analyser (EPMA), and zeta potential. The pigment functional groups involved in the generation of AgNPs were investigated using Fourier transform infrared spectroscopy. TEM images showed that the generated nanoparticles were spherical, hexagonal, rod-shaped, and triangular-shaped with a particle size distribution from 4 to 41 nm and exhibited a surface plasmon resonance at around 410 nm. DLS and zeta potential studies revealed that the particles were polydispersed and stable (−24.8 mV). EPMA confirmed the presence of elemental silver in the samples. Biosynthesized AgNPs exhibited minimum inhibitory concentrations of 32 and 4 μg/mL against E. coli and S. epidermidis, respectively. Further, cytotoxicity of the AgNPs was investigated against human cervical cancer (HeLa), human liver cancer (HepG2), and human embryonic kidney (HEK-293) cell lines using 5-fluorouracil as a positive control. A significant activity was recorded against HepG2 cell line with a half-maximal inhibitory concentration of 11.1 μg/mL.

show abstract

“…Gao et al reported that the dispersion and stability of Ag NPs mainly attribute to the surface charge [31]. The presence of negatively charged groups improves the stability and dispersion of Ag NPs in aqueous solutions [32].…”

Section: Structural Characterization Of Ag Npsmentioning

confidence: 99%

Biosynthesis and Antibacterial Activity of Silver Nanoparticles Using Yeast Extract as Reducing and Capping Agents

Shu¹,

He²,

et al. 2020

Nanoscale Res Lett

146

View full text Add to dashboard Cite

Biosynthesis for the preparation of antimicrobial silver nanoparticles (Ag NPs) is a green method without the use of cytotoxic reducing and surfactant agents. Herein, shape-controlled and well-dispersed Ag NPs were biosynthesized using yeast extract as reducing and capping agents. The synthesized Ag NPs exhibited a uniform spherical shape and fine size, with an average size of 13.8 nm. The biomolecules of reductive amino acids, alpha-linolenic acid, and carbohydrates in yeast extract have a significant role in the formation of Ag NPs, which was proved by the Fourier transform infrared spectroscopy analysis. In addition, amino acids on the surface of Ag NPs carry net negative charges which maximize the electrostatic repulsion interactions in alkaline solution, providing favorable stability for more than a year without precipitation. The Ag NPs in combination treatment with ampicillin reversed the resistance in ampicillinresistant E. coli cells. These monodispersed Ag NPs could be a promising alternative for the disinfection of multidrugresistant bacterial strains, and they showed negligible cytotoxicity and good biocompatibility toward Cos-7 cells.

show abstract

A novel explanation for the enhanced colloidal stability of silver nanoparticles in the presence of an oppositely charged surfactant

Cited by 35 publications

References 36 publications

Surface‐enhanced Raman scattering as a tool to study cationic surfactants exhibiting low critical micelle concentration

Surface‐enhanced Raman scattering as a tool to study cationic surfactants exhibiting low critical micelle concentration

Biosynthesis of Silver Nanoparticles Mediated by Extracellular Pigment from Talaromyces purpurogenus and Their Biomedical Applications

Biosynthesis and Antibacterial Activity of Silver Nanoparticles Using Yeast Extract as Reducing and Capping Agents

Contact Info

Product

Resources

About