Title
Synthesis and characterization of iron oxide nanoparticles dispersed in mesoporous aluminum oxide or silicon oxide
Date Issued
01 February 2011
Access level
metadata only access
Resource Type
journal article
Author(s)
Braga T.P.
Pinheiro A.N.
Xing Y.T.
Baggio-Saitovitch E.
Valentini A.
Centro Brasileiro de Pesquisas Físicas
Abstract
Iron oxide nanoparticles dispersed in aluminum (Al) or silicon (Si) oxides were prepared via a polymeric precursor derived from the Pechini method. The samples were characterized by thermogravimetric analysis, Fourier-transform infrared spectroscopy, X-ray diffraction, N2 adsorption/desorption isotherms (Brunauer-Emmett-Teller, BET), Mössbauer spectroscopy, and vibrating sample magnetometry (VSM). BET analysis shows that the samples are mesoporous materials and have a high surface area. The size of the Fe 2O3 nanoparticles in Al2O3 is smaller than that in SiO2. Mössbauer spectra of the samples show that the Fe2O3 nanoparticles in Al2O 3 are non-magnetic at room temperature but magnetic below 50 K. The FeSi samples are magnetic at both room and low temperatures. The magnetic measurements with VSM confirmed this point. © 2010 Springer Science+Business Media, LLC.
Start page
766
End page
773
Volume
46
Issue
3
Language
English
OCDE Knowledge area
Ingeniería de materiales
Química inorgánica, Química nuclear
Scopus EID
2-s2.0-79051471633
Source
Journal of Materials Science
ISSN of the container
15734803
Sponsor(s)
Acknowledgements The authors acknowledge the ‘‘Universidade Federal do Ceará’’ (UFC), CNPq/CT-PETRO, Dr. J. M. Sasaki (Laboratório de Raios X) for the DRX measurements. T. P. Braga and A. N. Pinheiro express gratitude for the scholarship from CAPES and CNPq. E Saitovitch acknowledges support from CNPq and FAPERJ (Cientista do Estado, PRONEX-FAPERJ and Pensa-Rio) for grants.
Sources of information:
Directorio de Producción Científica
Scopus