magnesium

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

“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.

INFLUENCE OF ULTRASOUND ON THE SYNTHESIS OF SILVER NANOPARTICLES BY GALVANIC REPLACEMENT IN SODIUM POLYACRYLATE SOLUTIONS

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.

Morphology of Zinc Deposited via Cementation over Magnesium Rotary Disc in ZnCl2+NH4Cl Aqueous Solutions

Zinc cementation by magnesium from ZnCl2+NH4Cl aqueous solutions has been investigated. The amount of magnesium has been established as 0.8–2.0 g per 1 g of conditioned zinc to obtain recovery degree  99 %. At low concentrations of Zn2+ ions (0.025–0.1 M ZnCl2) dispersed deposit is formed with nanoparticles of reduced metal; at high concentrations (0.25–0.5 M) coarse-crystalline and fern-shaped deposit is formed.

Palladium Deposition on Magnesium in PdCl2 Solutions in DMF

Palladium deposition on rotational magnesium disk and magnesium powder via cementation has been investigated in 0.01 M PdCl2 solutions in dimethylformamide. The reduction process started from 323–333 K without the induction period. Spheroidal microparticles of palladium and its agglomerates were found to be formed on the magnesium disk surface. Particles in the form of needles and plates by the width of 80–120 nm were formed on the surface of magnesium powder. The deposited particles are characterized by high adhesion to the substrate surface.