METHOD OF MAKING MAGNETITE NANOPARTICLES (VERSIONS) Russian patent published in 2017 - IPC C01G49/08 B82B3/00 B82Y30/00 

FIELD: medicine.

SUBSTANCE: invention can be used in medicine, photonics, electronics. Obtaining of magnetite nanoparticles Fe₃O₄ is performed by high-temperature reducing hydrolysis of iron (III) compounds in ethylene glycol medium in presence of precipitation agent and stabilizer. Precipitation agent is salt of lower carboxylic acids and alkali metals. Stabilizer is selected from group of polyelectrolites, polymers or surface-active substances. Stabilizer is substance, selected from: sodium dodecyl sulphate, cetyltrimethylammonium bromide, polyethylene glycol, polyacrylic acid. Initial solution is mixture containing water in amount of 0.6–8.0 Vol%, salt of lower carboxylic acid and alkali metal in amount according to molar ratio Fe³⁺/salt of carboxylic acid equal to 1/3–1/15, and stabilizer in amount according to molar ratio of stabilizer/Fe³⁺ equal to 1/5–1/10, the rest is ethylene glycol. Obtained reaction mixture is heated in atmospheric medium to 150–190 °C and kept at this temperature until complete deposition of magnetite.

EFFECT: invention enables synthesis in single step, obtain spherical particles of magnetite with average diameter from 50 to 300 nm.

2 cl, 1 dwg, 11 tbl, 11 ex