Abstract
The carbon coating in carbon-encapsulated magnetic nanoparticles is considered as a tight and impermeable barrier which should perfectly protect the magnetic core material from external chemical environment. To study the integrity of the coating, carbon-encapsulated iron nanoparticles were subjected to corrosion tests, in which various corrosion agents were used. Several mineral and organic acids, as well as active gaseous environments with various oxidation potential, were applied. Additionally, the corrosion resistance was studied under the so-called galvanic corrosion, using two metal ions (copper and silver) which have higher redox potential than the zero-valent iron. The release of iron from the core as well as the morphology, structural features, chemical composition, and magnetic properties of carbon-encapsulated iron nanoparticles was systematically monitored at each stage of the corrosion process. The largest release of Fe from the encapsulate core was observed when nitric acid was used as the corrosion agent.
Highlights
Carbon-encapsulated nanoparticles were discovered in 1993 [1] during the intensive research on the formation of fullerenes and carbon nanotubes in carbon arc discharge
The corrosion resistance has been studied for a variety of corrosion agents, which included (1) mineral acids and organic acid, (2) galvanic corrosion agents [Cu(II) and Ag(I)], and (3) ionized gases (Ar, O2, H2O, NH3)
It has been shown that mineral and organic non-oxidative acids do not lead to the substantial perforation of carbon coating in carbon-encapsulated iron nanoparticles
Summary
Carbon-encapsulated nanoparticles were discovered in 1993 [1] during the intensive research on the formation of fullerenes and carbon nanotubes in carbon arc discharge. They comprise of four crystalline phases: Figure 3 Fe content in carbon-encapsulated iron nanoparticles subjected to corrosions tests in mineral and organic acids at room (a) and boiling point (b) temperature.
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