Analysis of the ferromagnetic resonance spectra of aggregates of magnetite nanoparticles formed by a magnetic field

Sorokina, O. N.; Bychkova, A. V.; Kovarskii, A. L.

doi:10.1134/s1990793109020134

Cited by 20 publications

(17 citation statements)

References 9 publications

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“…This line may be due to aggregates of nanoparticles that contain more hemosiderin. The conclusion is based on the fact that the interaction between nanoparticles shifts the position of the FMR line toward the lower fields compared to that of isolated particles [56,57]. Aggregation of particles is also consistent with the histological data on irradiated tumor cells [58].…”

Section: Resultssupporting

confidence: 69%

Magnetic Resonance of Ferritin Crystalline Particles in Tumor Tissue

et al. 2012

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Lyophilized samples of human tumor tissue exposed and not exposed to radiation therapy were investigated by magnetic resonance spectroscopy. The measurements were taken in the temperature range of 4-280 K on an X-band electron paramagnetic resonance spectrometer. Two types of ferromagnetic resonance signals were detected. The first type signals (g eff & 2.1 7 2.4) were detected in the spectra of 25% of the samples. The orientational dependence of these signals has been found. The temperature dependences of the first type signals were measured. Specific features were observed near the temperature of 125 K. They are evidently typical for the Verwey phase transition in magnetite. We suppose that the first type signals may belong to arrays or chains of ferritin particles with the crystal core in the form of magnetite. The temperature dependences of magnetic resonance characteristics of ferritin in tumors are differ from those of the same characteristics of ferritin in healthy tissue investigated before. In spectra of irradiated tumors, the second type signals at low fields were detected which may be due to aggregates of different iron particles in cell lysosomes.

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Section: Resultssupporting

confidence: 69%

Magnetic Resonance of Ferritin Crystalline Particles in Tumor Tissue

et al. 2012

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“…It is known that aggregation of the particles leads to FMR spectra transformation [12]. When linear aggregates are formed and aligned along magnetic fields of the spectrometer their FMR spectrum is shifted significantly to low fields due to dipole-dipole interaction between the aggregated particles [12].…”

Section: Resultsmentioning

confidence: 99%

Magnetic Nanoparticles Aggregation in Magnetic Gel Studied by Electron Magnetic Resonance (EMR)

et al. 2012

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Aggregation of magnetic nanoparticles immobilized in polymer gels was studied by ferromagnetic resonance and paramagnetic sensor techniques. Ferromagnetic resonance spectra of magnetic gels prepared in the presence of external magnetic field of 1.5 kG were compared to the spectra of gels synthesized in the absence of a magnetic field. Application of a magnetic field led to formation of linear aggregates of magnetic particles in the polymer matrix. The aggregates did not come apart after the field was switched off. The fraction of aggregated particles (of 62(6)%) and aspect ratio (elongation) of the aggregates (12.6(1.3)) was determined using paramagnetic sensor technique.

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“…The particles were stabilized in dispersion electrostatically with an electrical double layer formed by adding 0.1 M phosphate-citrate buffer (0.05 M NaCl) with pH 4.0 [5]. The sizes of the particles were assessed by dynamic light scattering using a Zetasizer nano-S spectrometer (Malvern, United Kingdom), the median size was equal to 17 nm.…”

Section: Composites With Magnetitementioning

confidence: 99%

Nanocomposites for antenna-feeder systems

Bibikov

Kulikovskij

Sharafiev

et al. 2013

2013 IX Internatioal Conference on Antenna Theory and Techniques

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The paper presents results of study of frequency dependence of permittivity and permeability of composite materials based on various polymer matrices and fillers in the form of nanoscale powders -nanoparticles of Si, carbon nanotubes, and magnetite nanoparticles. It is shown that, using the nanodisperse electrically conducting fillers, it is possible to obtain materials with the required dielectric permittivity, and in the case of magnetic nanoparticles to obtain materials with the appropriate magnetic properties.The results may be useful in the development of antenna-feeder systems that include elements that focus or absorb microwave radiation.

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Analysis of the ferromagnetic resonance spectra of aggregates of magnetite nanoparticles formed by a magnetic field

Cited by 20 publications

References 9 publications

Magnetic Resonance of Ferritin Crystalline Particles in Tumor Tissue

Magnetic Resonance of Ferritin Crystalline Particles in Tumor Tissue

Magnetic Nanoparticles Aggregation in Magnetic Gel Studied by Electron Magnetic Resonance (EMR)

Nanocomposites for antenna-feeder systems

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