Magnetite nanoparticles prepared by co-precipitation method in different conditions / Aphesteguy J. C.,Kurlyandskaya G. V.,de Celis J. P.,Safronov A. P.,Schegoleva N. N. // MATERIALS CHEMISTRY AND PHYSICS. - 2015. - V. 161, l. . - P. 243-249.

ISSN/EISSN:

0254-0584 / 1879-3312

Type:

Article

Abstract:

Magnetic nanoparticles (MNPs) of pure magnetite (Fe3O4) were prepared in an aqueous solution (sample M-I) and in a water-ethyl alcohol mixture (sample M-II) by the co-precipitation method. The structure and magnetic properties of both samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), magnetic (M-H) and microwave measurements (FMR). The mean average particle diameter and particle size distribution was evaluated by the Dynamic Light Scattering (DLS) and Brunauer- Emmett-Teller techniques (BET). The Quantitative chemical analysis of iron was performed by Inductively Coupled Plasma (ICP)- Atomic Emission Spectroscopy (AES) technique. The MNPs prepared in aqueous solution show a higher grain than those prepared in the water-ethyl alcohol mixture. The type of phase structure in both cases can be defined as ``defective spinel{''}. The shape of the majority of M-I MNPs is octahedral. The shape of the majority of M-II MNPs is cubic. The specific surface area of MNPs was as high as 14.4 m(2)/g for M-I sample and 77.8 m(2)/g for sample M-II. The obtained saturation magnetization values of 75 emu/g (M-I) and 68 emu/g (M-II) are consistent with expected values for magnetite MNPs of observed sizes. Ferromagnetic resonance (FMR) measurements confirmed that MNPs of both types are magnetically homogeneous materials. FMR lines' position and line widths can be understood by invoking the local dipolar fields, deviations from sphericity, magnetocrystalline anisotropy and stresses. M-I sample shows sizeable zero field microwave absorption which is absent in the M-II case. The differences in microwave behaviour of M-I and M-II MNPs can be used in the design of microwave radiation absorbing multilayers. (C) 2015 Elsevier B.V. All rights reserved.

Author keywords:

Magnetic materials; Nanostructures; Chemical synthesis; Magnetic properties; Surface properties IRON-OXIDE NANOPARTICLES; CUBIC HEMATITE PARTICLES; DRUG-DELIVERY; FE3O4 NANOPARTICLES; FERRITE; POWDERS; TEMPERATURE; COMPOSITES; ABSORPTION

DOI:

10.1016/j.matchemphys.2015.05.

Web of Science ID:

ISI:000357139600030

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUL 1
Publisher	ELSEVIER SCIENCE SA
Address	PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Language	English
EISSN	1879-3312
Keywords-Plus	IRON-OXIDE NANOPARTICLES; CUBIC HEMATITE PARTICLES; DRUG-DELIVERY; FE3O4 NANOPARTICLES; FERRITE; POWDERS; TEMPERATURE; COMPOSITES; ABSORPTION
Research-Areas	Materials Science
Web-of-Science-Categories	Materials Science, Multidisciplinary
Author-Email	caphestegu@fi.uba.ar
ORCID-Numbers	Kurlyandskaya, Galina/0000-0002-3712-1637
Funding-Acknowledgement	National Program for the Promotion of Human and Innovation
Funding-Text	The authors thank the technicians of SGIker's {[}ICPAES] Service, financed by the National Program for the Promotion of Human and Innovation, ``Ministerio de Ciencia e Innovacion{''
Number-of-Cited-References	37
Usage-Count-Last-180-days	7
Usage-Count-Since-2013	67
Journal-ISO	Mater. Chem. Phys.
Doc-Delivery-Number	CL7GD