Evidence of particle-particle interaction quenching in nanocomposite based on oleic acid-coated Fe^sub 3^O^sub 4^ nanoparticles after over-coating with essential oil extracted from Croton cajucara Benth

This study reports on the synthesis and characterization of oleic acid (OA)-coated Fe3O4 nanoparticles (Fe3O4@OA) and AO plus essential oil (EO)-coated Fe3O4 nanoparticles (Fe3O4@OA/EO). The EO was extracted from Croton cajucara Benth (CCB) leaves; a plant from the Brazilian Amazon region. Structura...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2018-11, Vol.466, p.359
Main Authors: Medrano, JJA, Aragón, FFH, Leon-Felix, L, Coaquira, JAH, Rodríguez, AFR, Faria, FSEDV, Sousa, MH, Ochoa, JC Mantilla, Morais, PC
Format: Article
Language:English
Subjects:
Air conditioning
Chemical synthesis
Coating
Image transmission
Iron oxides
Magnetic permeability
Magnetic properties
Magnetism
Nanocomposites
Nanoparticles
Oleic acid
Particle interactions
Quenching
Thermogravimetric analysis
Transmission electron microscopy
X-ray diffraction
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Summary:This study reports on the synthesis and characterization of oleic acid (OA)-coated Fe3O4 nanoparticles (Fe3O4@OA) and AO plus essential oil (EO)-coated Fe3O4 nanoparticles (Fe3O4@OA/EO). The EO was extracted from Croton cajucara Benth (CCB) leaves; a plant from the Brazilian Amazon region. Structural and morphological characterizations were carried out using X-ray diffraction (XRD) and transmission electron microscopy (TEM) images, respectively. Additionally, thermogravimetric analysis and magnetization measurements (hysteresis cycle, zero field-cooled-ZFC, field-cooled-FC, and AC susceptibility) were used to assess thermal and magnetic properties of the as-fabricated samples. Rietveld refinement of XRD pattern confirmed the formation of magnetite phase with no extra phases, whereas TEM images revealed spherically-shaped nanoparticles in the Fe3O4@OA and (Fe3O4@OA/EO) samples with a mean physical size of 8.5 nm and 10.1 nm, respectively. ZFC and FC curves revealed the occurrence of blocked/frozen state below the maximum peak (Tmax) at ∼81 K and ∼40 K for the Fe3O4@OA and (Fe3O4@OA/EO) samples, respectively. Moreover, low-temperature AC susceptibility vs. T curves recorded in the range of 0.2–1000 Hz showed that the OA coating of the Fe3O4 nanoparticles leads to a spin-glass-like behavior credited to the strong particle-particle interactions; meanwhile, the double layer (AO + EO) coating of the Fe3O4 nanoparticles remarkably quenches the particle-particle interaction leading to a superparamagnetic-like behavior.
ISSN:0304-8853
1873-4766