Abstract
We investigated the reaction process in magnetite nanoparticle (MNP) synthesis by glow-discharge electrolysis in atmospheric air combined with iron electrolysis using NaCl aqueous solution as electrolyte. The iron electrolysis supplies Fe2+ in the solution, and electrons from the glow discharge induce liquid-phase reactions. We found experimentally that the concentration of dissolved oxygen (DO) in the solution is a key parameter in MNP synthesis. The excess oxidation of ferrous iron species at a high DO concentration causes the generation of hematite nanoparticles, while MNPs are mainly synthesized at a low DO concentration. Simple rate equations were solved to investigate the liquid-phase reaction process. The calculated results showed that the DO concentration reasonably changed the ratio between ferrous and ferric iron species, which will be important for the chemical composition of synthesized nanoparticles. The solution pH, which is locally increased by the glow discharge, affects the liquid-phase reaction process, especially through the hydroxylation of ferrous iron species.
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