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On the first evidence of exchange-bias feature in magnetically contrasted consolidates made from CoFe₂O₄-CoO core-shell nanoparticles.

ABSTRACT: Hetero-nanostructures based on magnetic contrast oxides have been prepared as highly dense nanoconsolidates. Cobalt ferrite-cobalt oxide core-shell type nanoparticles (NPs) were synthesized by seed mediated growth in polyol and subsequently consolidated by Spark Plasma Sintering (SPS) at 500?°C for a few minutes while applying a uniaxial pressure of 100?MPa. It is interesting to note that the exchange bias feature observed in the core-shell NPs is reproduced in their ceramic counterparts, or even attenuated. A systematic structural characterization was then carried out to elucidate the decrease in the exchange magnetic field, involving mainly advanced X-ray diffraction, zero-field and in-field ⁵⁷Fe Mössbauer spectrometry, magnetic measurements and electron microscopy.

SUBMITTER: Flores-Martinez N

PROVIDER: S-EPMC6923415 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature

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On the first evidence of exchange-bias feature in magnetically contrasted consolidates made from CoFe<sub>2</sub>O<sub>4</sub>-CoO core-shell nanoparticles.

Flores-Martinez Nancy N Franceschin Giulia G Gaudisson Thomas T Haj-Khlifa Sonia S Derouich Sarra Gam SG Yaacoub Nader N Grenèche Jean-Marc JM Menguy Nicolas N Valenzuela Raul R Ammar Souad S

Scientific reports 20191219 1

Hetero-nanostructures based on magnetic contrast oxides have been prepared as highly dense nanoconsolidates. Cobalt ferrite-cobalt oxide core-shell type nanoparticles (NPs) were synthesized by seed mediated growth in polyol and subsequently consolidated by Spark Plasma Sintering (SPS) at 500 °C for a few minutes while applying a uniaxial pressure of 100 MPa. It is interesting to note that the exchange bias feature observed in the core-shell NPs is reproduced in their ceramic counterparts, or eve ...[more]

PMID: 31857610

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Project description:The market for nanoparticles has grown significantly over the past few decades due to a number of unique qualities, including antibacterial capabilities. It is still unclear how nanoparticle toxicity works. In order to ascertain the toxicity of synthetic cobalt iron oxide (CoFe2O4) nanoparticles (CIONPs) in rabbits, this study was carried out. Sixteen rabbits in total were purchased from the neighborhood market and divided into two groups (A and B), each of which contained eight rabbits. The CIONPs were synthesized by the co-precipitation method. Crystallinity and phase identification were confirmed by X-ray diffraction (XRD). The average size of the nanoparticles (13.2 nm) was calculated by Scherrer formula (Dhkl = 0.9 λ/β cos θ) and confirmed by TEM images. The saturation magnetization, 50.1 emug-1, was measured by vibrating sample magnetometer (VSM). CIONPs were investigated as contrast agents (CA) for magnetic resonance images (MRI). The relaxivity (r = 1/T) of the MRI was also investigated at a field strength of 0.35 T (Tesla), and the ratio r2/r1 for the CIONPs contrast agent was 6.63. The CIONPs were administrated intravenously into the rabbits through the ear vein. Blood was collected at days 5 and 10 post-exposure for hematological and serum biochemistry analyses. The intensities of the signal experienced by CA with CIONPs were 1427 for the liver and 1702 for the spleen. The treated group showed significantly lower hematological parameters, but significantly higher total white blood cell counts and neutrophils. The results of the serum biochemistry analyses showed significantly higher and lower quantities of different serum biochemical parameters in the treated rabbits at day 10 of the trial. At the microscopic level, different histological ailments were observed in the visceral organs of treated rabbits, including the liver, kidneys, spleen, heart, and brain. In conclusion, the results revealed that cobalt iron oxide (CoFe2O4) nanoparticles induced toxicity via alterations in multiple tissues of rabbits.

Dataset Information

On the first evidence of exchange-bias feature in magnetically contrasted consolidates made from CoFe₂O₄-CoO core-shell nanoparticles.

Publications

On the first evidence of exchange-bias feature in magnetically contrasted consolidates made from CoFe<sub>2</sub>O<sub>4</sub>-CoO core-shell nanoparticles.

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Dataset Information

On the first evidence of exchange-bias feature in magnetically contrasted consolidates made from CoFe2O4-CoO core-shell nanoparticles.

Publications

On the first evidence of exchange-bias feature in magnetically contrasted consolidates made from CoFe<sub>2</sub>O<sub>4</sub>-CoO core-shell nanoparticles.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

On the first evidence of exchange-bias feature in magnetically contrasted consolidates made from CoFe₂O₄-CoO core-shell nanoparticles.