Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/27569
Title: Comparative study of iron oxide nanoparticles as-prepared and dispersed in Copaiba oil using Mössbauer spectroscopy with low and high velocity resolution
Authors: Oshtrakh, M. I.
Šepelák, V.
Rodriguez, A. F. R.
Semionkin, V. A.
Ushakov, M. V.
Santos, J. G.
Silveira, L. B.
Marmolejo, E. M.
Parise, M. D. S.
Morais, P. C.
Issue Date: 2013
Citation: Comparative study of iron oxide nanoparticles as-prepared and dispersed in Copaiba oil using Mössbauer spectroscopy with low and high velocity resolution / M. I. Oshtrakh, V. Šepelák, A. F. R. Rodriguez [et al.] // Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy. — 2013. — Vol. 100. — P. 94-100.
Abstract: Iron oxide nanoparticles, probably magnetite, as-prepared and dispersed in Copaiba oil were studied by Mössbauer spectroscopy using two different spectrometers: with a low velocity resolution (512 channels) for measurements at 295 and 21 K and with a high velocity resolution (4096 channels) for measurements at 295 and 90 K. The fitting of all measured spectra demonstrated that usual models applied to fit Mössbauer spectra of magnetite and maghemite particles were not suitable. Therefore, the recorded spectra were fitted using a large number of spectral components on the basis of better quality of the fit and linearity of differential spectra. The number of components obtained for the better fit appeared to be different for spectra measured with a low and a high velocity resolution. However, these results demonstrated differences of Mössbauer parameters for iron oxide nanoparticles as-prepared and dispersed in Copaiba oil at applied temperatures. The effect of Copaiba oil molecules on Mössbauer parameters may be a result of the interactions of polar molecules such as kaurinic acid with nanoparticles' surface.
Keywords: HYPERFINE INTERACTIONS
IRON OXIDE NANOPARTICLES
MAGNETIC FLUIDS
MÖSSBAUER SPECTROSCOPY
COMPARATIVE STUDIES
DIFFERENTIAL SPECTRA
HIGH VELOCITY
HYPERFINE INTERACTIONS
IRON OXIDE NANOPARTICLE
LOW VELOCITIES
MAGHEMITE PARTICLES
MOSSBAUER
NUMBER OF COMPONENTS
OIL MOLECULES
POLAR MOLECULES
SPECTRAL COMPONENTS
SSBAUER SPECTROSCOPIES
IRON ORES
MAGNETIC FLUIDS
MAGNETITE
MOLECULES
SPECTROMETERS
METAL NANOPARTICLES
ACID
FERUMOXYTOL
MONOCRYSTALLINE IRON OXIDE NANOPARTICLE
NANOPARTICLE
VEGETABLE OIL
CHEMISTRY
COMPARATIVE STUDY
CONFERENCE PAPER
METHODOLOGY
MOSSBAUER SPECTROSCOPY
ULTRASTRUCTURE
X RAY DIFFRACTION
ACIDS
FERUMOXYTOL
NANOPARTICLES
PLANT OILS
SPECTROSCOPY, MOSSBAUER
X-RAY DIFFRACTION
URI: http://hdl.handle.net/10995/27569
SCOPUS ID: 84869505284
WOS ID: WOS:000312181800015
PURE ID: 899021
ISSN: 1386-1425
DOI: 10.1016/j.saa.2012.02.080
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS

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