Synthesis of Fe3O4–Fe2O3@C Core-Shell Nanoparticles: Effect of Reactional Parameters on Structural and Magnetics Properties

Lima, Marla M.; Macuvele, Domingos Lusitâneo Pier; Nones, Janaína; Silva, Luciano L.; Riella, Humberto Gracher; Fiori, Márcio Antônio; Soares, Cíntia

doi:10.1007/s10904-019-01146-8

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…It is believed the reason behind that can be related to the influence of the H c field mainly by the composition (the presented phases) and the magnetic anisotropies, which are linked to the shape and crystallinity of the nanoparticles. 71,72 The crystal defects increase as the particle size gets smaller, which impacts the magnetic properties by creating notches at the center of magnetic domains and decreasing energy in the magnetic domain wall. Non-defective areas help improve magnetic properties.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

Naser,

Lafta,

Hashim

2024

Biotech and App Biochem

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The effects of 180, 210, and 230°C reaction temperatures on the structural and magnetic properties of synthesized iron sulfide nanoparticles were studied. The Rietveld refinement analysis result of the X‐ray diffraction data indicated that greigite was the dominant phase in all samples. The sample was prepared at 210°C for 18 h and had a greater wt% ratio of the greigite phase. The crystallite and particle sizes increased with increasing reaction temperatures. Scanning electron microscope images confirmed the presence of aggregation of synthesized rod‐shaped nanoparticles. The magnetic hysteresis curves of all samples showed ferromagnetic behavior at room temperature. The magnetic saturation of three samples increases with increased reaction temperature, but the coercive force has the opposite behavior. Antioxidant activity and cytotoxicity of the sample synthesized at 210°C were investigated. This sample killed cancer cells at relatively moderate and high concentrations with high viability of normal cells, demonstrating the sample's suitability for use in killing cancer cells while avoiding normal cells.

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Section: Magnetic Propertiesmentioning

confidence: 99%

Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

Naser,

Lafta,

Hashim

2024

Biotech and App Biochem

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“…Previous literature demonstrates how DOE can be used to show the synthetic parameters controlling nanoparticle size − and the factors, during synthesis, affecting the material structure . Therefore, DOE can be used as a powerful tool to optimize synthetic processes to reach a given composition or size or to direct its physical and chemical properties. − …”

Section: Introductionmentioning

confidence: 99%

Design of Experiments and Theoretical Investigation for Photoluminescence Optimization of Copper Aluminum Sulfide Nanoparticles through Controlling Crystalline Defects

Baum

Pretto

Gouvêa

et al. 2022

Crystal Growth & Design

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Copper aluminum sulfide has been explored as an interesting low-toxicity material for application in optoelectronics and biological labeling. Herein, we have applied design of experiments (DOE) and density functional theory simulations (DFT) to investigate the effect of experimental conditions on the optical properties of copper aluminum sulfide nanoparticles synthesized through the heat-up method. The resulting material was characterized by UV–vis-NIR absorption, photoluminescence spectroscopy, X-ray diffractometry (XRD), Raman spectroscopy, and transmission electron microscopy (TEM). XRD and Raman spectroscopy revealed the formation of copper aluminum sulfide alongside byproducts such as covellite, atacamite, paratacamite, and clinoatacamite. DOE revealed the concentration of aluminum precursor as the most important parameter to affect the photoluminescence (PL) intensity. This finding can be correlated to a donor–acceptor pair formed by a copper vacancy and copper substituted by aluminum as the responsible for PL emission. DFT simulations performed for different possible defects reproduced the role of the donor–acceptor pair and provided an insight on their role on PL. The potential application of the nanoparticles for fluorescence biological labeling was confirmed by confocal microscopy assay showing strong fluorescence under excitation at 405, 473, and 559 nm.

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Revealing carbon-iron interaction characteristics in sludge-derived hydrochars under different hydrothermal conditions

et al. 2022

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Synthesis of Fe3O4–Fe2O3@C Core-Shell Nanoparticles: Effect of Reactional Parameters on Structural and Magnetics Properties

Cited by 5 publications

References 34 publications

Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

Design of Experiments and Theoretical Investigation for Photoluminescence Optimization of Copper Aluminum Sulfide Nanoparticles through Controlling Crystalline Defects

Revealing carbon-iron interaction characteristics in sludge-derived hydrochars under different hydrothermal conditions

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