Magnetic particles iron powder

The presence of the magnetic field can be demonstrated by means of iron powder. The iron particles are aligned and grouped and the magnetic lines of force become visible. The direction and the number of lines per given area are called the magnetic flux. 

Kimata M, Nakagawa D, Hasegawa M (2003) Preparation of monodisperse magnetic particles by hydrolysis of iron alkoxide. Powder Technol 132 112-118... 

Carbonyl iron or carbonyl iron powder is metallic iron of extreme purity, produced as microscopic spherical particles by the reaction of carbon monoxide on iron ore. This reaction gives a liquid, called iron carbonyl Fe(CO), that is vaporized and deposited as a powder. Carbonyl iron is mainly used for magnetic cores for high-frequency equipment and for pharmaceutical application of iron. 

Abstract Smart composites based on carbonyl iron powder, micro and nano size Fe304 in ethylene - propylene and acrylonitrile - butadiene rubber were manufactured and studied. Elastomer samples with various volume fractions of magnetic particles were tested. To improve dispersion of applied fillers in polymer matrix, ionic liquids were added during the process of composites preparation. To align particles in elastomer, cross-linking process took place in magnetic field. 

The degradation of Ni(CO)4 or Fe(CO)5 to the respective metal and CO is a means of manufacturing high-purity nickel and iron. The thermal decomposition of Ni(CO)4 is used in the Mond process to refine nickel (see eq. 21.4). Iron powder for use in magnetic cores in electronic components is produced by thermally decomposing Fe(CO)5. The Fe particles act as nucleation centres for the production of particles up to 8 pm in diameter. 

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