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

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

1
Emanuel Institute of Biochemical Physics of RAS, Kosygina st., 4, 119334 Moscow, Russia
2
Semenov Institute of Chemical Physics of RAS, Kosygina st., 4, 119991 Moscow, Russia
3
Alikhanov Institute for Theoretical and Experimental Physics, Bol’shaya Cheremushkinskaya st., 25, 117218 Moscow, Russia
*
Author to whom correspondence should be addressed.
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. View Full-Text
Keywords: magnetic gels; nanoparticles; linear aggregates; paramagnetic sensor technique; ferromagnetic resonance magnetic gels; nanoparticles; linear aggregates; paramagnetic sensor technique; ferromagnetic resonance
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MDPI and ACS Style

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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