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Registration Number

0213U006808, 0112U004238 , R & D reports

Title

Synthesis, structural features and properties of ferromagnetic core / shell nanostructures

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Head

Belous Anatolii Grigorievich,

Registration Date

02-01-2014

Organization

V.I.Vernadskii Institute of General and Inorganic Chemistry NASU

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Synthesized nanoparticles with spinel structure based AFe2O4 (A = Mn, Fe, Co, Ni, Zn) by deposition of non-aqueous solutions of diethylene glycol and proved that after the synthesis is the formation of crystalline self-agglomerated particles whose dimensions do not exceed 2-8 nm and have a narrow size distribution. The synthesis of core/shell structures with different thickness Fe3O4/CoFe2O4 shell (shell) - 1, 2.5 and 3.5 nm in non-aqueous solutions of diethylene glycol . It is shown that the synthesized core/shell structure is crystalline, self-agglomerated characterized by a narrow size distribution and their size can be controlled . Studied the magnetic properties over a wide temperature range for nanoparticles AFe2O4 (A = Mn, Fe, Co, Ni, Zn) and core / shell structures. Found that all the synthesized nanoparticles at 300 K characterized by high saturation magnetization and low values of coercivity and saturation magnetization dependence on the applied magnetic field is described by the Langevin function , which indicates that they are superparamagnetic properties. Developed magnetic fluid based on aqueous solutions of agarose and synthesized nanoparticles AFe2O4 (A = Mn, Fe, Co, Ni, Zn) and core/shell structures. It is shown that the magnetic fluid are stable over time and not stratified. Established that nanoparticles individual compounds AFe2O4 (A = Mn, Fe, Co, Ni, Zn) are characterized by low values of specific energy losses SLP, ie they weakly heated under external electromagnetic fields. At the same time, the core / shell structures Fe3O4/CoFe2O4 there is a significant absorption of external electromagnetic field, resulting in a significant increase in the value SLP. Therefore designed core/shell structure and magnetic fluids based on them can be recommended for use in the treatment by hyperthermia.

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Єленіч Олександр Вікторович
Білоус Анатолій Григорович
Вьюнов Олег Іванович
Кобилянська Софія Дмитрівна
Плутенко Тетяна Олександрівна
Солопан Сергій Олександрович
Ступін Юрій Дмитрович

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2020-04-02