NANOCOMPOSITE DISPERSED MAGNETIC MATERIAL AND METHOD OF PRODUCING SAID MATERIAL Russian patent published in 2011 - IPC H01F1/42 B82B1/00 B82B3/00 

FIELD: chemistry.

SUBSTANCE: nanocomposite dispersed magnetic material has a core-shell structure, where the core is Fe₃O₄ nanoparticles, content in the material of which is equal to 5-56 wt %, and the shell is an amorphous polymer of N-phenylanthranilic acid, which is thermally stable in air at temperature of up to 500°C and in an inert atmosphere at temperature of up to 700°C. The method of producing said material involves hydrolysis of a mixture of FeCl₃x4H₂O and FeCl₃6H₂O in molar ratio 1:1-5 while heating in an alkaline medium to obtain Fe₃O₄ nanoparticles, attaching N-phenylanthranilic acid to the surface of said particles by using its alkaline solution with concentration of 0.05-0.2 mol/l, and polymerisation thereof in the presence of: ammonium persulphate -(NH₄)₂S₂O₈, hydrogen peroxide H₂O₂, potassium bichromate K₂Cr₂O₇ with ratio of oxidising agent - N-phenylanthranilic acid 0.66-5.0:1 for 0.5-24 hours at temperature from -10 to +60°C.

EFFECT: high homogeneity, heat resistance, magnetisation of saturation of the nanocomposite material with super paramagnetic properties, simple method of producing said material.

2 cl, 1 tbl, 16 ex, 3 dwg