METHOD OF PRODUCING SUPERPARAMAGNETIC NANOPARTICLES BASED ON IRON SILICIDE FeSi WITH MODIFIED SURFACE Russian patent published in 2020 - IPC C01B33/06 B82Y30/00 B82Y5/00 B82Y25/00 B82Y40/00 

FIELD: nanotechnologies.

SUBSTANCE: invention relates to nanotechnology and can be used for production of nanostructured biomedical materials. Method of producing superparamagnetic nanoparticles based on Fe₃Si iron silicide with modified surface includes synthesis of iron silicide Fe₃Si, transfer of obtained nanoparticles into aqueous solution. Iron and silicon are alternately deposited on atomically clean surface of monocrystalline NaCl at pressure less than 10^-6 Pa is used by thermal evaporation and condensation of iron and silicon atoms on substrate into homogeneous amorphous layers in atomic ratio Fe:Si = 3:1. Total thickness of Fe+Si layer is not more than 8 nm, total number of layers is not less than 8 pcs. Multilayer structure is subjected to thermal heating to temperature of 560 °C and held for 15 minutes. Sample is cooled at rate of not more than 0.6 °C/s to room temperature. Amorphous gold layer is deposited on the surface of the obtained structure. Sample is removed from the superhigh vacuum chamber and treated with deionized water with further treatment of the nanoparticles washed off from the NaCl surface with ultrasound.

EFFECT: presence of superparamagnetic properties, anisotropy of properties of nanoparticles and amplification of magnetomechanical action on biological target, increase of specific magnetization, possibility to control orientation of nanoparticles in external electric field.

1 cl, 2 dwg, 1 ex