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

Applied Sciences

Olga N. Sorokina²  Alexander L. Kovarski²  Marina A. Lagutina¹  Sergey A. Dubrovskii¹ 

[1] Semenov Institute of Chemical Physics of RAS, Kosygina st., 4, 119991 Moscow, Russia;Emanuel Institute of Biochemical Physics of RAS, Kosygina st., 4, 119334 Moscow, Russia;

关键词: magnetic gels;    nanoparticles;    linear aggregates;    paramagnetic sensor technique;    ferromagnetic resonance;   

DOI  :  10.3390/app2020342

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.