High-saturation magnetization in small nanoparticles of Fe3O4 coated with natural oils

Correa, Bruno Santos; Costa, M. S.; Cabrera-Pasca, G. A.; Sena, C.; Pinto, Rafael Henrique Holanda; Silva, Ana Paula S.; Carvalho, Raul Nunes de; Ishida, Lina; Ramon, J. G. A.; Freitas, R. S.; Saiki, M.; Matos, Izabela T.; Correa, Eduardo; Carbonari, A. W.

doi:10.1007/s11051-020-4761-5

Cited by 17 publications

(13 citation statements)

References 67 publications

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“…66 The size and structure of nanoparticles have been reported to be effectively controlled by the use of saturated fatty acids, particularly lauric acid (which is found in a higher percentage in palm kernel oil), which has been observed for Fe 3 O 4 nanoparticles in the literature. 5 The diversity of fatty acids in palm kernel oil facilitated the formation of different ligand pairs during the nucleation and growth stages of sample S 2 , compared to the oleylamine/oleic acid ligand pair used in sample S 1 . During the nucleation stage, these different ligand pairs (oleylamine/lauric acid, oleylamine/myristic acid, and oleylamine/myristic acid) bound to the surface of Ni nuclei in the form of carboxylates, promoting a heterogeneous nucleation process.…”

Section: Resultsmentioning

confidence: 99%

“…oils, extracted by supercritical CO 2 , as a green alternative in the thermal decomposition method to synthesize Fe 3 O 4 nanoparticles, resulting in enhanced superparamagnetic behavior with higher saturation magnetization values. 5 As a result, there is clear evidence that using natural oils as ligands in the synthesis and coating of nanoparticles can result in morphological and structural characteristics critical to magnetic properties and biocompatibility of nanoparticles. 56,57 Furthermore, the presence of an organic coating on Ni/Ni 3 C nanoparticles may contribute to their application in carbon nanostructure growth, as has been observed in the literature for coated and supported nanoparticles in organic materials.…”

Section: Introductionmentioning

confidence: 99%

“…The synthesis of transition metal nanoparticles encapsulated by transition-metal carbides has been the focus of recent research. − This is particularly significant because crystallization of these materials combines the intrinsic properties of transition metals such as high magnetic moments, superparamagnetism, and excellent catalytic activity with the chemical stability and high thermal and electrical conductivity of metallic carbides such as Fe 3 C, Co 2 C, Co 3 C, and Ni 3 C. − These enhanced nanoparticles are appealing for a wide range of applications, especially in the development of sophisticated catalysts for the hydrogen evolution reaction (HER). , However, a limiting factor for this application is the formation of strong bonds between H 2 and transition metals during the process, which lead to the degradation of these catalysts and compromise their catalytic performance. , …”

Section: Introductionmentioning

confidence: 99%

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Investigation of Ni/Ni₃C Nanoparticle Synthesis for Application as a Catalyst in Carbon Nanostructure Growth

Silva,

Cabrera-Pasca,

Souza

et al. 2023

ACS Appl. Nano Mater.

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The synthesis of functional Ni/Ni 3 C nanoparticles has attracted significant interest, especially in the field of electrocatalysis, where these promising nanoparticles are employed to develop sophisticated electrocatalysts, particularly for hydrogen production through the hydrogen evolution reaction. However, the significant reactivity of these systems makes them susceptible to degradation, compromising their catalyst performance. One solution explored to mitigate this problem involves the catalytic growth of carbon nanostructures to encapsulate and protect these nanoparticles. The mechanisms for the formation of carbon nanostructures from nanoparticles remain the subject of this study. Among the reported processes, the annealing of nanocatalysts has been described as a highly effective method for producing such systems. This process is influenced by parameters, such as the temperature, atmosphere, and structural and morphological characteristics of the nanocatalysts. In the work reported here, we evaluated the influence of different ligand pairs (oleylamine/oleic acid and oleylamine/palm kernel oil) on the structural, morphological, and magnetic properties of Ni/Ni 3 C nanoparticles obtained through thermal decomposition at 240 °C for 3 h. Additionally, we investigated the impact of annealing in a nitrogen atmosphere on the structural properties of these nanoparticles and the growth of carbon nanostructures as a protective mechanism. The analyses include conventional techniques such as X-ray diffraction, transmission electron microscopy (TEM), magnetization measurements, and thermogravimetric analysis with differential scanning calorimetry. Additionally, local analysis was conducted using perturbed angular correlation spectroscopy (PAC) across a broad temperature range (30−693 K), utilizing the radioactive tracer 111 In( 111 Cd) for these measurements. The characterizations revealed that palm kernel oil contributes to the formation of nanoparticles with a higher Ni 3 C content, a broader size distribution, and a lower saturation magnetization. The PAC measurements in the range of 30−50 K, along with density functional theory calculations, indicated the absence of the Ni-hcp phase in the nanoparticles, a topic frequently discussed in the literature. Moreover, the presence of Ni 3 C regions with carbon deficiency was identified, characterized by a quadrupole frequency (ν Q ) of 23 MHz and a hyperfine field (B hf ) of 1 T. The temperature-dependent local analysis, combined with thermal analysis and TEM measurements, confirmed the development of carbon nano-onions around the nanoparticles during thermal treatment above 695 K in a nitrogen atmosphere. This observation demonstrates that nanoparticles obtained with palm kernel oil, which has the highest Ni 3 C content, offer superior encapsulation of Ni nuclei through these graphitic nanostructures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of Ni/Ni₃C Nanoparticle Synthesis for Application as a Catalyst in Carbon Nanostructure Growth

Silva,

Cabrera-Pasca,

Souza

et al. 2023

ACS Appl. Nano Mater.

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“…The perturbed angular correlation (PAC) spectroscopy is a non-resonance hyperfine interaction technique that uses radioisotopes as probes 19 . These probe nuclei are added to the nanoparticles during nucleation and growth syntheses in extremely low quantities (fractions of ppm) acting as radioactive tracers sensing different regions inside the nanoparticles 20 , 21 . Moreover, local techniques based on hyperfine interactions have been applied to numerous nanoparticles and corresponding results have been very important to understand the magnetic properties and local crystalline structure.…”

Section: Introductionmentioning

confidence: 99%

Crystalline and magnetic properties of CoO nanoparticles locally investigated by using radioactive indium tracer

Santos

Cabrera-Pasca

Costa

et al. 2021

Sci Rep

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We herein report a comprehensive investigation on the magnetic, structural, and electric properties of CoO nanoparticles with different sizes by local inspection through hyperfine interactions measured in a wide range of temperatures (10–670 K) by using radioactive $$^{111}$$ 111 In($$^{111}$$ 111 Cd) tracers with the perturbed angular correlations technique. Small cobalt oxide nanoparticles with the characteristic size of 6.5 nm have been prepared by the wet chemical route that turned out to be essential to incorporate radioactivity tracers during nucleation and growth of the particles. Nanocrystalline samples with 22.1 nm size were obtained by thermal treatments under low pressure of helium at 670 K. The hyperfine data were correlated with X-ray diffraction, ZFC–FC magnetic measurements, and transmission electron microscopy to describe the structure, magnetic properties, size, and shape of samples. An analysis of the temperature evolution of hyperfine parameters revealed that the structural distortion and the magnetic disorder in the core and on the surface layer play an important role in the magnetic behavior of CoO nanoparticles.

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“…The perturbed angular correlation (PAC) spectroscopy is a non-resonance hyperfine interaction technique that uses radioisotopes as probe nuclei 19 . These probe nuclei are added to the nanoparticles during nucleation and growth syntheses in extremely low quantities (fractions of ppm) acting as radioactive tracers sensing different regions inside the nanoparticles 20,21 . Moreover, local techniques based on hyperfine interactions have been applied to numerous nanoparticles and their results have been very important to understand the magnetic properties and local crystalline structure.…”

Section: Introductionmentioning

confidence: 99%

Crystalline and magnetic properties of CoO nanoparticles locally investigated by using radioactive indium tracer

Santos

Cabrera-Pasca

Costa

et al. 2021

Preprint

View full text Add to dashboard Cite

We herein report a comprehensive investigation on the magnetic, structural, and electric properties of CoO nanoparticles with different sizes by local inspection through hyperfine interactions measured in a wide range of temperatures (10-670 K) by using radioactive 111In( 111Cd) tracers with the perturbed angular correlations (PAC) technique. Small cobalt oxide nanoparticles with 6.5 nm have been prepared by the wet chemical route, which has shown essential to incorporate radioactivity tracers during nucleation and grown syntheses. Nanocrystalline samples with 22 nm size were obtained by thermal treatments under low pressure of helium at 670 K. The hyperfine data were correlated with X-ray diffraction (XRD), ZFC-FC magnetic measurements and transmission electron microscopy (TEM) to describe the structure, magnetic properties, size, and shape of samples. An analysis of the temperature evolution of hyperfine parameters revealed that the structural distortion and the magnetic disorder in the core and on the surface layer play an important role in the magnetic behavior of CoO nanoparticles.

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High-saturation magnetization in small nanoparticles of Fe3O4 coated with natural oils

Cited by 17 publications

References 67 publications

Investigation of Ni/Ni₃C Nanoparticle Synthesis for Application as a Catalyst in Carbon Nanostructure Growth

Investigation of Ni/Ni₃C Nanoparticle Synthesis for Application as a Catalyst in Carbon Nanostructure Growth

Crystalline and magnetic properties of CoO nanoparticles locally investigated by using radioactive indium tracer

Crystalline and magnetic properties of CoO nanoparticles locally investigated by using radioactive indium tracer

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High-saturation magnetization in small nanoparticles of Fe3O4 coated with natural oils

Cited by 17 publications

References 67 publications

Investigation of Ni/Ni3C Nanoparticle Synthesis for Application as a Catalyst in Carbon Nanostructure Growth

Investigation of Ni/Ni3C Nanoparticle Synthesis for Application as a Catalyst in Carbon Nanostructure Growth

Crystalline and magnetic properties of CoO nanoparticles locally investigated by using radioactive indium tracer

Crystalline and magnetic properties of CoO nanoparticles locally investigated by using radioactive indium tracer

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Investigation of Ni/Ni₃C Nanoparticle Synthesis for Application as a Catalyst in Carbon Nanostructure Growth

Investigation of Ni/Ni₃C Nanoparticle Synthesis for Application as a Catalyst in Carbon Nanostructure Growth