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

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...

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Bibliographic Details
Published in:Applied sciences 2012-06, Vol.2 (2), p.342-350
Main Authors: Sorokina, Olga N., Kovarski, Alexander L., Lagutina, Marina A., Dubrovskii, Sergey A., Dzheparov, Fridrikh S.
Format: Article
Language:English
Subjects:
Anisotropy
Electrons
ferromagnetic resonance
Hydrogen peroxide
linear aggregates
Magnetic fields
magnetic gels
Microscopy
Nanoparticles
paramagnetic sensor technique
Physics
Sensors
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app2020342