Application of mechanical separation method with filtration for nanodispersed FeNi powders with carbon coating

https://doi.org/10.1080/1536383X.2024.2400270

It was shown that the method of mechanical separation with filtration could be used to separate metal nanoparticles in a carbon shell. The method was used for separation of FeNi nanoparticles with a carbon shell, previously isolated from carbon condensate by boiling in acids. The particles had a crystalline structure and magnetic characteristics (Mr/Ms = 0.30, Hc = 270 Oe). Method of mechanical separation with filtration made it possible to separate the sample into particles coated with a carbon shell (particles size 40–50 nm, size of the metal core 10–15 nm), and into metal particles with a diameter of 6–15 nm, dispersed in a carbon matrix. The work shows that the samples have similar magnetic properties (Mr/Ms = 0.27, Hc = 236 Oe) and chemical composition (Ni ∼ 10 wt.%, Fe ∼ 12 wt.%, C ∼ 57 wt.%). However, the samples differ in structure, one contains FeNi(220), FeNi(200), FeNi(111) and C(002) phases, while the other contains only FeNi(200) and C(002) phases.