Magnetite nanoparticles for medical applications

Dudric, Roxana; Souca, Gabriela; Szatmári, Ádám; Szilárd, Tamás; Nitica, Stefan; Iacoviță, Cristian; Moldovan, Alin; Știufiuc, Rareș; Tetean, R.; Burzo, E.

doi:10.1063/5.0001198

Cited by 6 publications

(8 citation statements)

References 11 publications

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“…Taking into account the distributions of constituent ions in tetrahedral and octahedral sites [ 5 , 7 , 34 ], the exchange fields, H ex , acting on octahedral and tetrahedral sites, were estimated in the mean-field approximation, according to relation (1). In the spinel structure, as Fe 3 O 4 , each tetrahedral Fe 3+ ion is surrounded by 12 octahedral ions, while an octahedral Fe 3+ has 6 tetrahedral nearest neighbors.…”

Section: Resultsmentioning

confidence: 99%

“…The nanocrystalline ferrites from series Fe 3 O 4 , CoFe 2 O 4, and Zn x Fe 3−x O 4 were prepared using a typical hydrothermal method, as already described [ 5 , 7 , 34 ]. The morphology of the nanoparticles has been investigated by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) using Hitachi HD2700 equipment.…”

Section: Methodsmentioning

confidence: 99%

“…In this paper, we analyze the magnetic behavior of some nanocrystalline iron-based ferrites by extending our previous studies [ 5 , 7 , 34 ]. The presence of spin-glass behavior superposed on essentially ferrimagnetic-type ordering was shown and analyzed in correlation with the exchange interactions between the two sublattices.…”

Section: Introductionmentioning

confidence: 94%

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New Insights on the Spin Glass Behavior in Ferrites Nanoparticles

Burzo

Tetean

2022

Nanomaterials

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The magnetic properties of nanocrystalline MxFe3−xO4 ferrites with M=Fe, Co, and Zn were investigated. The data support a core–shell model, where the core is ferrimagnetically ordered, and the shell shows a spin glass type behavior. The reduced magnetizations of spin glass components follow an mg = (1 – b/H−1/2) field dependence. The b values are strongly correlated with the intensities of exchange interactions. The field dependences of the magnetoresistances of Fe3O4 and ZnxFe3−xO4 nanoparticles pellets, experimentally determined, are well described if instead of the core reduced magnetization, commonly used, that of the shell is taken into account. For similar compositions of the nanoparticles, identical b values are obtained both from magnetization isotherms and magnetoresistances studies. The half-metallic behavior of spinel Fe3O4 based nanoparticles is discussed comparatively with those of double perovskites.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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New Insights on the Spin Glass Behavior in Ferrites Nanoparticles

Burzo

Tetean

2022

Nanomaterials

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“…The lattice constants were refined using Whole Powder Pattern Fitting (WPPF). The average crystallite size was calculated from the (311) diffraction line using Scherrer’s equation: D = kλ/(β·cosθ) where k = 0.90, λ is the wavelength of X-ray, β is full width at the half maximum (FWHM) of the peak is the diffraction angle [ 42 , 43 , 44 ].…”

Section: Methodsmentioning

confidence: 99%

Magnetic Core-Shell Iron Oxides-Based Nanophotocatalysts and Nanoadsorbents for Multifunctional Thin Films

et al. 2022

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In recent years, iron oxides-based nanostructured composite materials are of particular interest for the preparation of multifunctional thin films and membranes to be used in sustainable magnetic field adsorption and photocatalysis processes, intelligent coatings, and packing or bio-medical applications. In this paper, superparamagnetic iron oxide (core)-silica (shell) nanoparticles suitable for thin films and membrane functionalization were obtained by co-precipitation and ultrasonic-assisted sol-gel methods. The comparative/combined effect of the magnetic core co-precipitation temperature (80 and 95 °C) and ZnO-doping of the silica shell on the photocatalytic and nano-sorption properties of the resulted composite nanoparticles were investigated by ultraviolet-visible (UV-VIS) spectroscopy monitoring the discoloration of methylene blue (MB) solution under ultraviolet (UV) irradiation and darkness, respectively. The morphology, structure, textural, and magnetic parameters of the investigated powders were evidenced by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, Brunauer–Emmett–Teller (BET) measurements, and saturation magnetization (vibrating sample magnetometry, VSM). The intraparticle diffusion model controlled the MB adsorption. The pseudo- and second-order kinetics described the MB photodegradation. When using SiO2-shell functionalized nanoparticles, the adsorption and photodegradation constant rates are three–four times higher than for using starting core iron oxide nanoparticles. The obtained magnetic nanoparticles (MNPs) were tested for films deposition.

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“…The CoFe 2 O 4 nanoparticles were prepared using a typical hydrothermal method [ 18 , 19 ]. The Fe(III)acetylacetonate (0.4 mmol) and Co(II) acetylacetonate (0.2 mmol) were dissolved in 55 mL ethylene glycol and kept at a temperature of 50 °C.…”

Section: Methodsmentioning

confidence: 99%

New Insights into the Magnetic Properties of CoFe2O4@SiO2@Au Magnetoplasmonic Nanoparticles

et al. 2022

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We report the successful synthesis and a complete magnetic characterization of CoFe2O4@SiO2@Au magnetoplasmonic nanoparticles. The CoFe2O4 magnetic nanoparticles were prepared using the hydrothermal method. A subsequent SiO2 shell followed by a plasmonic Au shell were deposited on the magnetic core creating magnetoplasmonic nanoparticles with a core–shell architecture. A spin-glass-type magnetism was shown at the surface of the CoFe2O4 nanograins. Depending on the external magnetic field, two types of spin-glass were identified and analyzed in correlation with the exchange field acting on octahedral and tetrahedral iron sites. The magnetization per formula unit of the CoFe2O4 core is not changed in the case of CoFe2O4@SiO2@Au nanocomposites. The gold nanoparticles creating the plasmonic shell show a giant diamagnetic susceptibility, dependent on their crystallite sizes.

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Magnetite nanoparticles for medical applications

Cited by 6 publications

References 11 publications

New Insights on the Spin Glass Behavior in Ferrites Nanoparticles

New Insights on the Spin Glass Behavior in Ferrites Nanoparticles

Magnetic Core-Shell Iron Oxides-Based Nanophotocatalysts and Nanoadsorbents for Multifunctional Thin Films

New Insights into the Magnetic Properties of CoFe2O4@SiO2@Au Magnetoplasmonic Nanoparticles

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