Characteristic of the Nanoparticles Formed on the Carbon Steel Surface Contacting with 3d-Metal Water Salt Solutions in the Open-Air System

Abstract

The contact of a steel electrode with water dispersion medium in an open-air system leads to the development of various polymorphic iron oxides and oxyhydroxides on the steel surface. Whereas the usage of distilled water causes the obtaining of Fe(II)-Fe(III) layered double hydroxides (green rust) as a primary mineral phase, but in the presence of inorganic 3d-metal water salt solutions, mixed layered double hydroxides (LDHs) together with non-stoichiometric spinel ferrite nanoparticles are formed on the steel surface. Mixed LDHs keep stability against further oxidation and complicate the obtaining of spinel ferrite nanoparticles. Thermal treatment of mixed LDHs among other mineral phases formed via the rotation-corrosion dispergation process at certain temperatures permits to obtain homogenous nanoparticles of spinel ferrites as well as maghemite or hematite doped by 3d-metal cations.

Development of an innovative catalyst for neutralization of carbon monoxide in multi-chamber kilns of electrode blanks

“…After that, the modified zeolite was separated from the aqueous phase by decantation, washed, and air-dried to a constant weight. The processes of formation of nano-and micro-sized iron oxide structures of manganese ferrite take place with the participation of FeOOH at pH values of the dispersion medium of 6.0-9.7, which corresponds to the conditions of research [9].…”

“…Ferritic nanomaterials have found their application in the manufacture of fundamentally new magnetic carriers, magnetically controlled sensors, catalysts, application materials and sorbents based on them, colloidal carriers for the active delivery of drugs in the magnetic field, excipients of drugs, sensors, pigments, etc. [8,9].…”

Surface Magnetic Properties and Magnetization Dynamics of Magnetite Nanoparticles Doped with Platinum Ions

“…Magnetite nanoparticles doped with platinum cations were formed on the iron-carbon alloy (Steel 3-St3) via the rotation-corrosion dispergation (RCD) route [8]. The phase formation process was performed under free entrance of air oxygen and carbon dioxide onto the electrode surface.…”