Magnetic Nanoparticles Aggregation in Magnetic Gel Studied by Electron Magnetic Resonance (EMR)
Source abstract
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.
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Research context
OpenAlex topics: Characterization and Applications of Magnetic Nanoparticles · Micro and Nano Robotics · Magnetic and Electromagnetic Effects
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Emanuel Institute of Biochemical Physics of RAS, Kosygina st., 4, 119334 Moscow, Russia
Semenov Institute of Chemical Physics of RAS, Kosygina st., 4, 119991 Moscow, Russia
Alikhanov Institute for Theoretical and Experimental Physics, Bol’shaya Cheremushkinskaya st., 25, 117218 Moscow, Russia
References (18)
Show source-provided references
1. FMR study of magnetic nanoparticles embedded in non-magnetic matrix
2. Smart composites with controlled anisotropy10.1016/j.polymer.2005.03.102 ↗
3. Brechignac, C., Houdy, P., and Lahmani, M. (2007). Nanomaterials and Nanochemistry, Springer-Verlag.10.1007/978-3-540-72993-8 ↗
4. Yoon, M., and Tománek, D. (2010). Equilibrium structure of ferrofluid aggregates. J. Phys., 22.10.1088/0953-8984/22/45/455105 ↗
5. Magnetic gelation: A new method for the preparation of polymeric anisotropic porous material10.1039/c0sm00553c ↗
6. Chainlike assembly of magnetite coated with SiO2 nanostructures induced by an applied magnetic field10.1016/j.materresbull.2007.06.009 ↗
7. Van der Waals versus dipolar forces controlling mesoscopic organizations of magnetic nanocrystals10.1038/nmat1054 ↗
8. Fang, W.-X., He, Z.-H., Xu, X.-Q., Mao, Z.-Q., and Shen, H. (2007). Magnetic-field-induced chain-like assembly structures of Fe3O4 nanoparticles. EPL, 77.10.1209/0295-5075/77/68004 ↗
9. ESR Line shape of paramagnetic particles in a magnetic liquid. Theory and experiment10.1134/S0021364009110083 ↗
10. Estimation of the oblongness of aggregates of magnetic particles formed in static magnetic field using ESR spectroscopy10.1063/1.3530067 ↗
11. Kuznetsov, A.N. (1976). Metod Spinovogo Zonda, Nauka Pub.
12. Analysis of the ferromagnetic resonance spectra of aggregates of magnetite nanoparticles formed by a magnetic field10.1134/S1990793109020134 ↗
13. Theory of paramagnetic resonance line breadths in diluted crystals
14. Abragam, A. (1961). The Principles of Nuclear Magnetism, Oxford University Press.10.1119/1.1937646 ↗
15. Noginova, N., Weaver, T., King, M., Bourlinos, A.B., Giannelis, E.P., and Atsarkin, V.A. (2007). NMR and spin relaxation in systems with magnetic nanoparticles. J. Phys., 19.10.1088/0953-8984/19/7/076210 ↗
16. Abragam, A., and Goldman, M. (1982). Nuclear Magnetism: Order & Disorder, Clarendon Press.10.1063/1.2914893 ↗
17. Magnetic resonance in magnetically diluted solids at low temperatures
18. Magnetic resonance in magnetically diluted solids at low temperatures10.1002/pssb.2221510227 ↗