Correlation between coprecipitation reaction course and magneto-structural properties of iron oxide nanoparticles

Smolková, Ilona S.; Parmar, Harshida; Babayan, Vladimir; Smolka, Petr; Sáha, Petr

doi:10.1016/j.matchemphys.2015.02.022

Cited by 40 publications

(27 citation statements)

References 57 publications

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“…Furthermore, the morphology was observed with a field emission scanning electron microscope (FE-SEM; JSM-6700F, JEOL, 18.0 kV). The induction heating properties of magnetic fluids consisting of the sample powder (5 mass %) and glycerol (Smolkova et al 2015) were evaluated using an AC magnetic field generator composed of a radio frequency power source (T162-5723A, THAMWAY), an impedance matching box (T020-5723F, THAMWAY), and a solenoid coil (70 mm in inner diameter) with 21 turns of copper tube (4 mm in outer diameter and 3 mm in inner diameter). Cooling water flowed inside the copper tube.…”

Section: Characterizationmentioning

confidence: 99%

Synthesis and magnetic induction heating properties of Gd-substituted Mg–Zn ferrite nanoparticles

2017

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Gadolinium-substituted magnesium-zinc ferrite (Mg x Zn 1-x Gd y Fe 2-y O 4 ) nanoparticles with different metal compositions for x between 0 and 1 and y between 0 and 0.06 were synthesized via coprecipitation of metal hydroxides, followed by calcination. Their crystal structure was characterized via X-ray diffraction analysis, confirming that the Gd-substituted Mg-Zn ferrite samples had a single-phase spinel structure. The metal composition significantly affected the crystal structure, including the lattice parameters and crystallite size. Scanning electron microscopy (SEM) showed that the ferrite samples had a diameter of approximately 50-200 nm. Furthermore, the temperature rise in an alternating magnetic field was measured, and the magnetic induction heating properties were evaluated using the specific absorption rate (SAR) determined from the temperature profile. The SAR significantly varied depending on the compositions of x and y. When x = 0.5 and y = 0.02, the SAR was found to be at maximum. This reveals that the compositions can control the magnetic induction heating properties. The results suggest that Gd-substituted Mg-Zn ferrite nanoparticles are promising candidates for magnetic hyperthermia applications.

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Section: Characterizationmentioning

confidence: 99%

Synthesis and magnetic induction heating properties of Gd-substituted Mg–Zn ferrite nanoparticles

2017

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“…However, as was shown in [13,16] for the nanocrystalline Fe 3 O 4 phase large surface area and its distortion as well as deviations from stoichiometry led to the additional sextet lines that have to be incorporated into the analysis. Therefore, to obtain a good fit of the experimental lines, four sextet components were used in the analysis.…”

Section: Resultsmentioning

confidence: 98%

“…The analysis of spectra was performed using Normos software. For the time dependence of temperature characteristics the magnetite nanoparticles were dispersed in glycerol and sonicated for 5 min [12,13]. In order to assess the heating efficiency of the magnetite nanoparticles dispersion and specific loss power (SLP), the self-constructed setup was used.…”

Section: Samples Preparation and Experimental Methodsmentioning

confidence: 99%

Phase Structure and Heat Generation in the Co-Precipitated Magnetite Nanoparticles

et al. 2017

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In the present studies the phase structure and magnetic ordering of magnetite nanoparticles were investigated. The powder samples were obtained by co-precipitation from Fe(III) and Fe(II) salts. SiO2 coating was performed using the modified Stöber process. X-ray diffraction studies revealed presence of the only one Fe3O4 crystalline phase both for the non-coated and SiO2-coated samples. The Mössbauer studies have shown differences in shapes of measured spectral lines for Fe3O4 particles subjected to the Stöber process and non-coated particles. The heating efficiency was measured for glycerol dispersed nanoparticles. The analysis have shown changes in specific loss power depending on the concentration of the nanoparticles and amplitude of alternating magnetic field.

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“…For the synthesis of iron oxide magnetic nanoparticles we applied coprecipitation method with synthesis parameters verified in our previous studies, that guarantee formation of uniform, highly crystalline nanoparticles [4,5]. Obtained nanoparticles have average size of 13 nm and polydispersity 0.3 according to TEM investigations ( Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Iron oxide magnetic nanoparticles were prepared by co-precipitation method according to [4,5]. Briefly, solution of iron (II) and iron (III) chlorides with molar ratio Fe 2+ :Fe 3+ = 1 : 2 was slowly added into the ammonia solution (0.38 M) with continuous heating to 70…”

Section: Synthesis Of Iron Oxide Magnetic Nanoparticlesmentioning

confidence: 99%

Size Dependent Heating Efficiency of Multicore Iron Oxide Particles in Low-Power Alternating Magnetic Fields

et al. 2017

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Aggregates of superparamagnetic nanoparticles, so called multicore particles get much attention due to collective magnetic behaviour. Despite the fact that saturation magnetization and coercivity of multicore particles are lower than for single particles of comparable size, they can generate large amount of heat in alternating magnetic field. This makes them promising for magnetic hyperthermia. However, correlation between internal magnetic structure of multicore particles and their heating ability in alternating magnetic fields are not clear yet. Detailed experimental investigations are required to determine the optimal sizes of multicore particles and the alternating magnetic field parameters to obtain maximal heat. In this study, we demonstrated how hydrodynamic size of multicore particles influences alternating magnetic field energy absorption. Dense aggregates composed of bare magnetic iron oxide nanoparticles of 13 nm were obtained by coprecipitation. Further peptization allowed to gain aqueous dispersions of multicore particles with various hydrodynamic size, varing from 85 to 170 nm, due to electrostatic stabilization. Multicore particles dispersions have saturation magnetization of 40 A m 2 /kgFe 3 O 4 and coercivity of 79.6 A/m regardless of their size. Dispersion of 85 nm multicore particles is stable and provides specific loss power of 42 W/gFe. Further increase of hydrodynamic size leads to low stability and loss of the ability to generate heat in alternating magnetic field.

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Correlation between coprecipitation reaction course and magneto-structural properties of iron oxide nanoparticles

Cited by 40 publications

References 57 publications

Synthesis and magnetic induction heating properties of Gd-substituted Mg–Zn ferrite nanoparticles

Synthesis and magnetic induction heating properties of Gd-substituted Mg–Zn ferrite nanoparticles

Phase Structure and Heat Generation in the Co-Precipitated Magnetite Nanoparticles

Size Dependent Heating Efficiency of Multicore Iron Oxide Particles in Low-Power Alternating Magnetic Fields

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