Nano- and microparticles of iron with a modified surface and prospects for their application. Part I: Copper-coated iron particles

The catalytic properties of metal copper in chemical reactions between ferrite-garnet materials and orthophosphoric acid are described. It was shown that the reactions occur more efficiently provided copper is used in the form of shells on nano- and microparticles of iron and stirring of the etching agent is performed by the magnetic fields. The formation of the metal copper on iron particles is carried out using a chemical method owing to the reaction between the iron particles and the water solution of blue vitriol and sulphuric acid. The highest efficiency of stirring is registered using a magnetic field with a variable direction of the magnetic field gradient.