Magnetic composites based on hybrid spheres of aluminum oxide and superparamagnetic nanoparticles of iron oxides

被引：12

作者：

Braga, Tiago P. ^{[1
]}

Vasconcelos, Igor F. ^{[2
]}

Sasaki, Jose M. ^{[3
]}

Fabris, J. D. ^{[4
]}

de Oliveira, Diana Q. L. ^{[4
]}

Valentini, Antoninho ^{[1
]}

机构：

[1] Univ Fed Ceara, Dept Quim Analit & Fis Quim, Langmuir Lab Adsorcao & Catalise, BR-60455970 Fortaleza, Ceara, Brazil

[2] Univ Fed Ceara, Dept Met & Mat Engn, BR-60455970 Fortaleza, Ceara, Brazil

[3] Univ Fed Ceara, Lab Raios 10, Dept Fis, BR-60455970 Fortaleza, Ceara, Brazil

[4] Univ Fed Minas Gerais, Dept Quim, Belo Horizonte, MG, Brazil

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2010年 / 322卷 / 06期

关键词：

Hybrid sphere; Nanoparticle; Iron oxide; Aluminum; Superparamagnetic; MORPHOLOGY;

D O I：

10.1016/j.jmmm.2009.10.028

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Materials containing hybrid spheres of aluminum oxide and superparamagnetic nanoparticles of iron oxides were obtained from a chemical precursor prepared by admixing chitosan and iron and aluminum hydroxides. The oxides were first characterized with scanning electron microscopy, X-ray diffraction, and Mossbauer spectroscopy. Scanning electron microscopy micrographs showed the size distribution of the resulting spheres to be highly homogeneous. The occurrence of nano-composites containing aluminum oxides and iron oxides was confirmed from powder X-ray diffraction patterns; except for the sample with no aluminum, the superparamagnetic relaxation due to iron oxide particles were observed from Mossbauer spectra obtained at 298 and 110K; the onset six line-spectrum collected at 20K indicates a magnetic ordering related to the blocking relaxation effect for significant portion of small spheres in the sample with a molar ratio Al:Fe of 2:1. (C) 2009 Elsevier B. V. All rights reserved.

引用

页码：633 / 637

页数：5

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