“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.
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.
The influence of technological factors on the regularities of obtaining silver nanoparticles using polyvinylpyrrolidone as reducing agent has been researched and its influence in compositions content on antimicrobial properties of last ones have been defined. The impact of temperature and polyvinylpyrrolidone content as well as Ag+ concentration on the kinetics of the reduction reaction of silver ions was determined. Silver-containing composites in the form of porous blocks and films were synthesized and their bactericidal and fungicidal properties were studied.
Stable silver nanoparticles were rapidly synthesized by simple, eco-friendly atmospheric pressure plasma method using non-ionic Tween 80 (polyoxyethylene-(80)-sorbitan monooleate) as capping agent. Influences of Tween 80 concentration on the formation efficiency of silver nanoparticle, their average size and stability have been studied. The synthesized silver nanoparticles had significant antibacterial activity on two strains of Gram bacteria.
The contact non-equilibrium low-temperature plasma technique is used to synthesize silver nanoparticles (AgNPs) employing polyvinyl pyrrolidone (PVP) as a capping agent. Influences of PVP concentration on the formation efficiency of silver nanoparticle, their average size and stability have been studied. The synthesized silver nanoparticles had a significant antibacterial activity against two strains of Gram bacteria. Silver nanoparticles (AgNPs)-alginate composite beads with different PVP concentration were synthesized as materials for water purification.
The results of investigations of the influence of main parameters (surfactant concentration and temperature) on the synthesis of silver nanoparticles (AgNPs) by the sonoelectrochemical method in polyvinylpyrrolidone (PVP) solutions by cyclic voltammetry (CVA) are presented. It is shown that the ultrasonic field (22 kHz) leads to an increase in the anodic and cathodic currents by ~30%.
The article presents the results of studies of electrochemical deposition of silver nanoparticles (AgNPs) on the silicon surface in dimethylformamide solutions of 0.025M; 0.05M; 0.1M (NH4)[Ag(CN)2]. Combination of a pulsed electrolysis mode and an organic aprotic solvent medium (DMF) ensures the formation of 50-150 nm spherical AgNPs with uniform distribution over the silicon surface. It is shown that the main factors influencing the morphology and size of silver nanoparticles are the value of the cathode potential, the concentration of ions [Ag(CN)2]- and the duration of electrolysis.
This work presents the results of research the electromagnetic radiation influence on the change in the geometric shape of spherical silver nanoparticles, obtained by method of photostimulated recovery of Ag ions from salt solution (AgNO3). Сrystalline sodium citrate (Na3C6H5O7) was used to recover Ag by anions of citrate acid. Due to adsorption on the surface of silver nanoparticles and creating electrostatic barrier that prevents aggregation of silver nanoparticles, sodium citrate was also used as a stabilizer.
The polymerization of hydroxylapatite compositions of 2-hydroxyethylmethacrylate with polyvinylpyrrolidone in the presence of silver salts was researched, and it was found that silver salts retard the polymerization velocity. The composites as porous blocks, that containing in their structure silver nanoparticles, were synthesized and their antibacterial and antifunginal properties were confirmed.
The regularities of receiving the silver nanoparticles by reaction of silver restoring from salts with polyvinylpyrrolidone without using the conventional restoring agents, including toxic substances, were researched. The influence of silver salt nature, medium, polyvinylpyrrolidone molecular weight on the size of nanoparticles was determined. Досліджено закономірності одержання наночастинок срібла реакцією відновлення його з солей полівінілпіролідоном без використання традиційних відновників, зокрема токсичних.