Synthesis and characterization of uncoated and gold-coated magnetite nanoparticles

Félix, Lizbet León; Chaker, Juliano Alexandre; Parise, M.; Coaquira, J. A. H.; Valladares, L. De Los Santos; Bustamante, Ángel; Garg, V. K.; Oliveira, A. C.; Morais, P.C.

doi:10.1007/s10751-013-0857-y

Cited by 26 publications

(10 citation statements)

References 20 publications

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“…Therefore, the MW showed a soft magnetism behavior [37,38,39]. The lower right corner illustration shows the camera images of the magnet attracting samples.…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal Synthesis of Nanooctahedra MnFe2O4 onto the Wood Surface with Soft Magnetism, Fire Resistance and Electromagnetic Wave Absorption

et al. 2017

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In this study, nanooctahedra MnFe2O4 were successfully deposited on a wood surface via a low hydrothermal treatment by hydrogen bonding interactions. As-prepared MnFe2O4/wood composite (MW) had superior performance of soft magnetism, fire resistance and electromagnetic wave absorption. Among them, small hysteresis loops and low coercivity (<±5 Oe) were observed in the magnetization-field curve of MW with saturation magnetization of 28.24 emu/g, indicating its excellent soft magnetism. The MW also exhibited a good fire-resistant property due to its initial burning time at 20 s; while only 6 s for the untreated wood (UW) in combustion experiments. Additionally, this composite revealed good electromagnetic wave absorption with a minimum reflection loss of −9.3 dB at 16.48 GHz. Therefore, the MW has great potential in the fields of special decoration and indoor electromagnetic wave absorbers.

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“…Therefore, the MW showed a soft magnetism behavior [37,38,39]. The lower right corner illustration shows the camera images of the magnet attracting samples.…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal Synthesis of Nanooctahedra MnFe2O4 onto the Wood Surface with Soft Magnetism, Fire Resistance and Electromagnetic Wave Absorption

et al. 2017

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“…The hybrid gold‐coated magnetite was reported to show a lower saturation ( M sat = 81 A m 2 kg –1 ) than that of Fe 3 O 4 @OAc ( M sat = 92 A m 2 kg –1 ) due to Au‐ion diffusion into the Fe 3 O 4 lattice causing magnetic disorder. In contrast León‐Félix et al66 reported the synthesis of Fe 3 O 4 @Au (8 nm) by coprecipitation of iron salts, and further thermal treatment in the presence of HAuCl 4 to develop the Au coating shell. In this case a slight increase in magnetic saturation was observed, which is attributed to the recrystallization of magnetically disordered regions on the surface of the magnetite NPs.…”

Section: Synthetic Design Of Core@shell Mnps For Biological Applicmentioning

confidence: 96%

Iron Oxide Based Nanoparticles for Magnetic Hyperthermia Strategies in Biological Applications

et al. 2015

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The use of multifunctional nanoparticles (NPs), usually in the range of 3–100 nm, with their newly discovered properties – such as superparamagnetic (SPM) behaviour, enhancement of activity and selectivity in catalytic processes and localised surface plasmon resonance (LSPR) – offers new technical possibilities for biomedical applications such as magnetic hyperthermia (MH), plasmonic photothermal therapy (PPTT) and enhanced magnetic resonance imaging (MRI). In addition, the small size of NPs presents a unique opportunity to interfere, in a highly localised and specific way, with natural processes involving viruses, bacteria or cells and allows interference in the development of complex diseases like many types of cancer and neuropathies (Alzheimer's, Parkinson's, Kreutzer–Jacobs'). The design of biological applications based on MH is a chemical challenge and core@shell structures are most often used to endow NPs with multifunctional abilities. The success of such MH‐based biological applications depends on the magnetic functionality of the core as well as the properties of the surface shell in direct interaction with the biological medium. In this review we will describe the most important methodologies developed to synthesise magnetic core@shell nanostructures and their MH applications.

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“…Iron oxide nanoparticles at a nanometric scale have been intensively studied due to their superparamagnetic properties and also because of their lack of toxicity at low concentrations of different types of cells [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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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Synthesis and characterization of uncoated and gold-coated magnetite nanoparticles

Cited by 26 publications

References 20 publications

Hydrothermal Synthesis of Nanooctahedra MnFe2O4 onto the Wood Surface with Soft Magnetism, Fire Resistance and Electromagnetic Wave Absorption

Hydrothermal Synthesis of Nanooctahedra MnFe2O4 onto the Wood Surface with Soft Magnetism, Fire Resistance and Electromagnetic Wave Absorption

Iron Oxide Based Nanoparticles for Magnetic Hyperthermia Strategies in Biological Applications

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

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