Influence of ultrasound on the synthesis of silver nanoparticles by galvanic replacement in sodium polyacrylate solutions

2021 ◽  
Vol 4 (2) ◽  
pp. 17-22
Author(s):  
G. І. Zozulia ◽  
◽  
R. V. Mnykh ◽  
О. І. Kuntyi ◽  
А. S. Lapa ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Reducing Agents ◽  
Maximum Absorption ◽  
Galvanic Replacement ◽  
Sodium Polyacrylate ◽  
Mechanical Stirring ◽  
Magnesium Surface

Sonogalvanic replacement and galvanic replacement synthesis of silver nanoparticles (AgNPs) by magnesium scrap in sodium polyacrylate solutions were studied. It was found that during these processes in NaPA solutions silver is practically not deposited on the magnesium surface. Sodium polyacrylate provides stabilization of AgNPs with the formation of yellow solutions with maximum absorption of ~415 nm. It is shown that sonogalvanic replacement synthesis of AgNPs occurs due to the simultaneous course of galvanic replacement by magnesium and sonoreduction of Ag (I) by radicals and reducing agents. The rate of sonogalvanic replacement synthesis of AgNPs is 20-30% higher compared to galvanic substitution by mechanical stirring.

scholarly journals Synthesis of Antibacterially ActiveSilver Nanoparticles by Galvanic Replacement on Magnesium in Solutions of Sodium Polyacrylate in an Ultrasound

2021 ◽  
Vol 15 (4) ◽  
pp. 493-499
Author(s):  
Galyna Zozulya ◽  
◽  
Orest Kuntyi ◽  
Roman Mnykh ◽  
Martyn Sozanskyi ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Absorption Maximum ◽  
Spherical Shape ◽  
Galvanic Replacement ◽  
Sodium Polyacrylate ◽  
Combined Action ◽  
And Staphylococcus Aureus

“Green” synthesis of silver nanoparticles (AgNPs) by a galvanic replacement (GR) on magnesium in solutions of sodium polyacrylate (NaPA) under ultrasound (42 kHz) is reported. The mechanism of combined action of GR and ultrasound on the formation of nanoparticles is proposed. Synthesized solutions of AgNPs are characterized by an absorption maximum at 410 nm, the value of which does not depend on the concentrations of precursors (AgNO3 and NaPA) and the duration of the process. The dimensions of nanoparticles that have a spherical shape do not exceed 30 nm. With increasing concentration of surfactant, there is a tendency to decrease in size. The rate of synthesis of AgNPs increases almost in proportion to the concentration of AgNO3 in the solution, while the effect of NaPA concentration is negligible. The synthesized nanoparticles efficiently demonstrated a bactericide effect on Escherichia coli and Staphylococcus aureus.

scholarly journals Effect of both protective and reducing agents in the synthesis of multicolor silver nanoparticles

2013 ◽  
Vol 8 (1) ◽  
Author(s):  
Pedro Jose Rivero ◽  
Javier Goicoechea ◽  
Aitor Urrutia ◽  
Francisco Javier Arregui
Keyword(s):  
Silver Nanoparticles ◽  
Reducing Agents

Evolution Analysis of Silver Nanoparticles Synthesised by Lactam Reduction: A Case Study of ϵ-Caprolactam

2018 ◽  
Vol 71 (8) ◽  
pp. 587 ◽  
Author(s):  
Na Zhang ◽  
Jianping Duan ◽  
Dajiang Zhao ◽  
Guisheng Yang
Keyword(s):  
Silver Nanoparticles ◽  
Size Distribution ◽  
Ostwald Ripening ◽  
Silver Ions ◽  
Reducing Agents ◽  
Ag Nps ◽  
Second Stage ◽  
Evolution Analysis ◽  
Ostwald Ripening Mechanism

Without using protecting agent and solvent, silver nanoparticles (Ag NPs) were synthesised by using lactams as reducing agents. Being the most commercially available lactam, ϵ-caprolactam (CL) was taken as a model to illustrate the evolution of Ag NPs in the medium of lactams. The results showed that there were two different stages involved in the Ag NP evolution process. In the first stage, particles were stabilised against further coalescence at a smaller size (< 5 nm) because of face-bound CL. In the second stage, the Ostwald ripening mechanism cooperated with continuous reduction of residual silver ions, which resulted in the resultant particles being distributed with different size distribution. The participation of CL in the reducing and protecting procedures raised a complex evolution of Ag NPs.

Synthesis of Silver Nanoparticles Using o-Hydroxybenzoic, p-Hydroxybenzoic, and o,p-Dihydroxybenzoic Acids as Reducing Agents

2017 ◽  
Vol 901 ◽  
pp. 26-31 ◽  
Author(s):  
Dian Susanthy ◽  
Fadliah ◽  
Endang Tri Wahyuni ◽  
Sri Juari Santosa
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Reducing Agents ◽  
Reducing Agent ◽  
Para Position ◽  
Hydroxyl Groups ◽  
Hydroxybenzoic Acid ◽  
Dihydroxybenzoic Acid ◽  
Transmission Electron ◽  
Shape And Size

Synthesis of silver nanoparticles (AgNPs) by reduction of AgNO3 with o-hydroxybenzoic, p-hydroxybenzoic and o,p-dihydroxybenzoic acids as reducing agents was investigated. This research was conducted to determine the effect of the position and number of hydroxyl groups towards the size, shape and stability of the resulted AgNPs. Surface Plasmon Resonance (SPR) of AgNPs was characterized by UV/Vis spectrophotometer, the shape and size of AgNPs was determined by Transmission Electron Microscope (TEM). The results showed that the reducing agent that has substituents in the para position (p-hydroxybenzoic acid) has the higher reduction ability than the others. AgNPs were yielded by all types of reducing agents in alkaline system. Reducing agents which have greater number of substituents (o,p-dihydroxybenzoic acid) could produce AgNPs with smaller concentration of AgNO3 than the others. AgNPs that was produced by reducing agent having substituents on the para position (p-hydroxybenzoic acid) was more stable and smaller particle size, i.e. 34 ± 1.78 nm than reducing agent that has substituent on the ortho para positions (with particle size 45 + 3.67 nm) and ortho positions (with particle size 70 ± 4.96 nm).

scholarly journals Synthesis of silver nanoparticles using reducing agents obtained from natural sources (Rumex hymenosepalus extracts)

2013 ◽  
Vol 8 (1) ◽  
pp. 318 ◽  
Author(s):  
Ericka Rodríguez-León ◽  
Ramón Iñiguez-Palomares ◽  
Rosa Navarro ◽  
Ronaldo Herrera-Urbina ◽  
Judith Tánori ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Reducing Agents ◽  
Natural Sources

Green synthesis, characteristics and antimicrobial activity of silver nanoparticles mediated by essential oils as reducing agents

2020 ◽  
Vol 28 ◽  
pp. 101746
Author(s):  
Matheus Vinicius de Oliveira Brisola Maciel ◽  
Aline da Rosa Almeida ◽  
Michelle Heck Machado ◽  
Welman Curi Elias ◽  
Cleonice Gonçalves da Rosa ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Essential Oils ◽  
Green Synthesis ◽  
Reducing Agents

Highly effective antimicrobial nanocomposites based on hydrogel matrix and silver nanoparticles: long-lasting bactericidal and bacteriostatic effects

Soft Matter ◽  
2019 ◽  
Vol 15 (40) ◽  
pp. 8059-8066 ◽  
Author(s):  
Melisa Monerris ◽  
Martin F. Broglia ◽  
Edith I. Yslas ◽  
Cesar A. Barbero ◽  
Claudia R. Rivarola
Keyword(s):  
Silver Nanoparticles ◽  
Reducing Agents ◽  
Hydrogel Matrix ◽  
Highly Effective

Bactericidal and bacteriostatic properties of nanocomposites based on hydrogel matrixes as reducing agents and stabilizers of silver nanoparticles synthesized in situ photochemically without the addition of additives.

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