Moessbauer Characterization of Magnetite/Polyaniline Magnetic Nanocomposite

Journal Article · Thu Dec 02 00:00:00 EST 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3530045· OSTI ID:21506936

Rodriguez, Anselmo F. R.; Lopez, Jorge L; Mesquita, Antonio G. G. ^[1]; Coaquira, Jose A. H.; Oliveira, Aderbal C; Morais, Paulo C ^[2]; Azevedo, Ricardo B ^[3]; Araujo, Ana C. V. de; Alves, Severino Jr; Azevedo, Walter M. de ^[4]

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1. Universidade Federal do Acre, Centro de Ciencias Biologicas e da Natureza, Rio Branco AC 69915-900 (Brazil)
2. Universidade de Brasilia, Instituto de Fisica, Brasilia DF 70910-900 (Brazil)
3. Universidade de Brasilia, Instituto de Ciencias Biologicas, Brasilia DF 70910-900 (Brazil)
4. Universidade Federal de Pernambuco, Laboratorio de Quimica do Estado Solido, Departamento de Quimica Fundamental, Recife PE 50970-901 (Brazil)

Aniline surface coated Fe{sub 3}O{sub 4} nanoparticles have been successfully synthesized by UV irradiation varying the time and the acid media (HCl, HNO{sub 3}, or H{sub 2}SO{sub 4}). The synthesized material represents a promising platform for application in nerve regeneration. XRD patterns are consistent with the crystalline structure of magnetite. Nevertheless, for UV irradiation times longer than 2 h, extra XRD lines reveal the presence of goethite. The mean crystallite size of uncoated particles is estimated to be 25.4 nm, meanwhile that size is reduced to 19.9 nm for the UV irradiated sample in HCl medium for 4 h. Moessbauer spectra of uncoated nanoparticles reveal the occurrence of thermal relaxation at room temperature, while the 77 K-Moessbauer spectrum suggests the occurrence of electron localization effects similar to that expected in bulk magnetite. The Mossbauer spectra of UV irradiated sample in HCl medium during 4 h, confirms the presence of the goethite phase. For this sample, the thermal relaxation is more evident, since the room temperature spectrum shows larger spectral area for the nonmagnetic component due to the smaller crystallite size. Meanwhile, the 77 K-Moessbauer spectrum suggests the absence of the electron localization effect above 77 K.

• OSTI ID: 21506936
• Journal Information: AIP Conference Proceedings, Vol. 1311, Issue 1; Conference: 8. international conference on the scientific and clinical applications of magnetic carriers, Rostock (Germany), 25-29 May 2010; Other Information: DOI: 10.1063/1.3530045; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
AGGLOMERATION
ANILINE
ELECTRONS
FERRITES
GOETHITE
IRON OXIDES
IRRADIATION
MAGNETITE
MOESSBAUER EFFECT
NANOSTRUCTURES
NMR IMAGING
PARTICLES
REGENERATION
RELAXATION
SPECTRA
SULFURIC ACID
SURFACES
TEMPERATURE RANGE 0273-0400 K
X-RAY DIFFRACTION
AMINES
AROMATICS
CHALCOGENIDES
COHERENT SCATTERING
DIAGNOSTIC TECHNIQUES
DIFFRACTION
ELEMENTARY PARTICLES
FERMIONS
FERRIMAGNETIC MATERIALS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
INORGANIC COMPOUNDS
IRON COMPOUNDS
IRON ORES
LEPTONS
MAGNETIC MATERIALS
MATERIALS
MINERALS
ORES
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SULFUR COMPOUNDS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS