METHOD OF MAGNETITE NANOPARTICLE COATING WITH GOLD LAYER Russian patent published in 2017 - IPC A61K49/06 B82B3/00 

FIELD: metallurgy.

SUBSTANCE: invention refers to methods of obtaining magnetite (Fe₂O₄) nanoparticles coated with a layer of gold, that can be used as a contrasting agent for magnetic resonance tomography, magnetic separation, targeted drug delivery, etc. The method of magnetite nanoparticle coating with a layer of gold involves sequential injection of aqueous solution of sodium citrate, aqueous solution of chloroauric acid and aqueous solution of hydroxylamine hydrochloride into aqueous solution of magnetite nanoparticles, where magnetite nanoparticles are treated additionally with 1-3M aqueous solution of chloric acid for 1-30 minutes before injection of aqueous solution of sodium citrate.

EFFECT: output of gold-coated magnetite nanoparticles increased by 1,37-1,47 times, possible obtainment of modified nanoparticles with more narrow size distribution.

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