Structure of the nanosized spinel ferrites obtained via rotation-corrosion dispergation route and their interaction with oleic acid solutions

Abstract

The structure, chemical composition and morphology of the nanosized spinel ferrite particles formed under rotation-corrosion dispergation conditions on the steel 3 surface have been studied using an X-ray diffraction method, X-ray fluorescence spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy. It was shown, that the chemical composition of the obtained structures does not achieve a stoichiometrical ferrite ratio (2 : 1) iron to other 3d-metal. The presence of the nanoscale building blocks, corresponding to varied iron oxide phases, in the IR spectra of the spinel ferrites gives the reason to assign them to coagulative type of the structure. As it was determined, the interaction of copper-bearing spinel ferrites with oleic acid solutins leads to desorption of copper from the particle’s surface and the formation of the coloured complexes of copper oleate. At the same time, the contact of cobalt-containing spinel ferrites with n-hexane and chloroform oleic acid solutions stabilizes the particle’s surface and does not lead to extraction of cobalt from their crystal lattice.