Synthesis of Fe/Fe3O4 core-shell nanoparticles by electrical explosion of the iron wire in an oxygen-containing atmosphere

Abstract

Magnetic nanoparticles based on iron and its oxides are promising in various biomedical applications. Currently, as a rule, ferromagnetic iron oxide particles with a low specific magnetic moment are used for medical purposes. In the present work, a new method for the synthesis of magnetic nanoparticles based on the electric explosion of a Fe wire is proposed. When wires are dispersed by high current electric pulse in an inert atmosphere containing less than 5% oxygen, nanoparticles with a core-shell structure are formed, where the core is α-Fe and the shell is formed by a mixture of oxides Fe 3 O 4 and FeO. The oxygen concentration in the buffer gas has been found to determine the size of the resulting nanoparticles, their shape, and iron content. The iron oxide shell protects the iron core from the external environment, preventing the rapid dissolution of Fe containing in the nanoparticles, in contrast to nanoparticles obtained in argon atmosphere. The specific magnetic moment of nanoparticles, depending on the content of iron oxides, varies from 90 to 180 emu/g. Keywords Fe-Fe 3 O 4 nanoparticles . Electrical explosion of a wire . Oxidation . Core-shell structures . Magnetic properties

Fabrication of strong bioresorbable composites from electroexplosive Fe-Fe3O4 nanoparticles by isostatic pressing followed by vacuum sintering

“…Thus, we can assume that the iron core of the particles is covered by an iron oxide shell. The earlier studies of similar particles confirm such structure [18]. The size distribution of nanoparticles is close to the normal-logarithmic variant of the distribution with asymmetry on the right side.…”

“…To produce nanoparticles, an iron wire with a diameter of 0.3 mm and a length of 65 mm was exploded by a pulse of current at a voltage of 28.5 kV and a capacitance of 1.6 μF in a mixture of argon and oxygen gases, where the oxygen content was 1.3 vol. % according to the method described in [ 18 ]. In this mode, Fe - Fe 3 O 4 particles with a core-shell structure are formed, with the iron content being about 81 wt.…”

“…Fe - Fe 3 O 4 nanocomposites can be obtained by electrical explosion of a Fe wire (EEW) in an oxygen-containing atmosphere [ 18 ]. The formation of nanoparticles during an electrical explosion occurs during rapid condensation of metal vapors, which contributes to the uniform distribution of the phases formed over the bulk of the nanoparticle with small sizes of coherent scattering regions [ 19 , 20 ].…”

Preparation and Properties of Iron Nanoparticle-Based Macroporous Scaffolds for Biodegradable Implants

“…The technique of Fe nanopowder preparation has been described in detail previously [ 36 ]. To prepare the Fe nanopowder, an Fe wire (99.8%) with a diameter of 0.3 mm and a length of 65 mm was exploded by a high-current impulse at a voltage of 28.5 kV and a capacitance of 1.6 µF in argon (2 × 10 5 Pa).…”

Magnetite Nanoparticles Different Sizes Effectiveness On Growth And Secondary Metabolites In Ginkgo Biloba L. Callus

“…Many methods are used for the synthesis of metal nanoforms such as physical, chemical and biological measures [8][9]. Magnetite nanoparticles can be prepared by various chemical and green methods for many applications, the most important of which is in the agricultural field [10][11][12]. In this regard, there are several types of research on plant species using iron nanoparticles [4,[13][14][15][16][17][18].…”