Vacancy ordered γ-Fe2O3 nanoparticles functionalized with nanohydroxyapatite: XRD, FTIR, TEM, XPS and Mössbauer studies

Ramos-Guivar, Juan A.; Sanches, Edgar Aparecido; Bruns, Florian; Sadrollahi, E.; Morales, Marco A.; López, Elvis O.; Litterst, F. J.

doi:10.1016/j.apsusc.2016.07.157

Cited by 127 publications

(35 citation statements)

References 73 publications

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“…The lattice parameter calculated in the present study was equal to 8.349 Å. Furthermore, if we compare value obtained for the lattice parameter calculated in the present study with those found in literature it can be seen a good agreement [30][31][32]. In good agreement with previous studies [33], the slight broadening of the diffraction lines can be interpreted in terms of small sized crystallites.…”

Section: Discussionsupporting

confidence: 90%

Synthesis, Characterization, and Toxicity Evaluation of Dextran-Coated Iron Oxide Nanoparticles

Balaș

Ciobanu

Burtéa

et al. 2017

Metals

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Abstract:We report the synthesis of dextran-coated iron oxide magnetic nanoparticles (DIO-NPs) with spherical shape and uniform size distribution as well as their accumulation and toxic effects on Jurkat cells up to 72 h. The characterization of dextran-coated maghemite nanoparticles was done by X-ray diffraction and dynamic light scattering analyses, transmission electron microscopy imaging, attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, magnetic hysteresis, and relaxometry measurements. The quantification of DIO-NPs intracellular uptake showed a progressive accumulation of iron as a function of time and dose accompanied by additional lysosome formation and an increasing darkening exhibited by a magnetic resonance imaging (MRI) scanner. The cytotoxicity assays revealed a decrease of cell viability and a loss of membrane integrity in a time-and dose-dependent manner. Exposure to DIO-NPs determined an increase in reactive oxygen species level up to 72 h. In the first two days of exposure, the level of reduced glutathione decreased and the amount of malondyaldehyde increased, but at the end of the experiment, their concentrations returned to control values. These nanoparticles could be used as contrast agents for MRI but several parameters concerning their interaction with the cells should be taken into consideration for a safe utilization.

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Section: Discussionsupporting

confidence: 90%

Synthesis, Characterization, and Toxicity Evaluation of Dextran-Coated Iron Oxide Nanoparticles

Balaș

Ciobanu

Burtéa

et al. 2017

Metals

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“…When x = 0.7, the Mössbauer spectrum of the sample consisted only of a central doublet, and it exhibited superparamagnetic character. The central doublet can be due to the nonmagnetic nearest neighbors of Fe 3+ ions, as the Fe 3+ ions of magnetic isolation do not take part in long-range magnetic ordering [22,23,24]. …”

Section: Resultsmentioning

confidence: 99%

Magnetic and Mössbauer Spectroscopy Studies of Zinc-Substituted Cobalt Ferrites Prepared by the Sol-Gel Method

Lin

Yang

et al. 2018

Materials

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Zinc ion-substituted cobalt ferrite powders Co1−xZnxFe2O4 (x = 0–0.7) were prepared by the sol-gel auto-combustion process. The structural properties and magnetic of the samples were investigated with X-ray diffraction (XRD), superconducting quantum interference device, and a Mössbauer spectrometer. The results of XRD showed that the powder of a single cubic phase of ferrites calcined when kept at 800 °C for 3 h. The lattice constant increases with increase in Zn concentration, but average crystallite size does not decrease constantly by increasing the zinc content, which is related to pH value. It was confirmed that the transition from ferrimagnetic to superparamagnetic behaviour depends on increasing zinc concentration by Mössbauer spectra at room temperature. Magnetization at room temperature increases for x ≤ 0.3, but decreases for increasing Zn2+ ions. The magnetization of Co0.7Zn0.3Fe2O4 reached maximum value (83.51 emu/g). The coercivity decreased with Zn2+ ions, which were doped on account of the decrease of the anisotropy constant.

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“…After calcination (Figure b), peaks attributed to PB NPs completely disappear, and all of the diffraction peaks match well with data for Fe 2 O 3 (JCRDS no. 39‐1346), assignable to (200), (311), (400), (511), and (220) crystal planes …”

Section: Resultsmentioning

confidence: 99%

An Explosive Bomb‐Inspired Method to Prepare Collapsed and Ruptured Fe₂O₃/Nitrogen‐Doped Carbon Capsules as Catalyst Support

Zhang

Feng

et al. 2017

Chemistry A European J

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Compared with integrated capsules, ruptured ones have better mass diffusion and transport properties due to large gaps in the shells. However, most studies focus on integrated capsules, whereas little attention has been paid to the ruptured counterparts. Herein, an explosive bomb-inspired method was employed to prepare collapsed and ruptured Fe O /nitrogen-doped carbon (CR-Fe O /NC) capsules by using polystyrene (PS) nanoparticles (NPs) as a hard template, and polypyrrole (PPy) with embedded Prussian blue (PB) NPs as the shell. During pyrolysis, PB is converted into Fe O , and PPy is carbonized to form NC. Importantly, the PS core decomposes into gas molecules, leading to high pressure inside of the capsule, which explodes the thin shell into pieces. The roles of shell thickness and amount of Fe O on determining the spherical or collapsed, and integrated or ruptured morphology were revealed. Taking advantage of structural merits, including large gaps, thin shells, low density, and high surface area, CR-Fe O /NC capsules were used as supports for Pd NPs. These capsules exhibited better catalytic activity than that of integrated ones. Due to the magnetic properties, they could be reused at least five times.

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Vacancy ordered γ-Fe2O3 nanoparticles functionalized with nanohydroxyapatite: XRD, FTIR, TEM, XPS and Mössbauer studies

Cited by 127 publications

References 73 publications

Synthesis, Characterization, and Toxicity Evaluation of Dextran-Coated Iron Oxide Nanoparticles

Synthesis, Characterization, and Toxicity Evaluation of Dextran-Coated Iron Oxide Nanoparticles

Magnetic and Mössbauer Spectroscopy Studies of Zinc-Substituted Cobalt Ferrites Prepared by the Sol-Gel Method

An Explosive Bomb‐Inspired Method to Prepare Collapsed and Ruptured Fe₂O₃/Nitrogen‐Doped Carbon Capsules as Catalyst Support

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Vacancy ordered γ-Fe2O3 nanoparticles functionalized with nanohydroxyapatite: XRD, FTIR, TEM, XPS and Mössbauer studies

Cited by 127 publications

References 73 publications

Synthesis, Characterization, and Toxicity Evaluation of Dextran-Coated Iron Oxide Nanoparticles

Synthesis, Characterization, and Toxicity Evaluation of Dextran-Coated Iron Oxide Nanoparticles

Magnetic and Mössbauer Spectroscopy Studies of Zinc-Substituted Cobalt Ferrites Prepared by the Sol-Gel Method

An Explosive Bomb‐Inspired Method to Prepare Collapsed and Ruptured Fe2O3/Nitrogen‐Doped Carbon Capsules as Catalyst Support

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Product

Resources

About

An Explosive Bomb‐Inspired Method to Prepare Collapsed and Ruptured Fe₂O₃/Nitrogen‐Doped Carbon Capsules as Catalyst Support