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Appl. Sci. 2012, 2(2), 342-350; doi:10.3390/app2020342
Article

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

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Received: 7 February 2012 / Revised: 26 March 2012 / Accepted: 27 March 2012 / Published: 10 April 2012
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Abstract

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.
Keywords: magnetic gels; nanoparticles; linear aggregates; paramagnetic sensor technique; ferromagnetic resonance magnetic gels; nanoparticles; linear aggregates; paramagnetic sensor technique; ferromagnetic resonance
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Sorokina, O.N.; Kovarski, A.L.; Lagutina, M.A.; Dubrovskii, S.A.; Dzheparov, F.S. Magnetic Nanoparticles Aggregation in Magnetic Gel Studied by Electron Magnetic Resonance (EMR). Appl. Sci. 2012, 2, 342-350.

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