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A study of magnetic liquids with the help of a paramagnetic sensor

Russian Journal of Physical Chemistry A volume 81, pages 301–307 (2007)Cite this article

Abstract

The paramagnetic sensor method was used to study local magnetic fields in a magnetite aqueous suspension. The sensor was 2,2,6,6-tetramethyl-4-hydroxypiperidine-1-oxyl, a stable nitroxide radical. The lines in the EPR spectrum of the sensor were demonstrated to be broadened due to the dipole-dipole interaction with magnetite nanoparticles. It was established that no spin exchange occurred between sensor molecules and magnetite nanoparticles. The g-factor was found to decrease with the concentration of magnetite nanoparticles in the suspension. The mean strengths of the local magnetic fields calculated from changes in the EPR spectrum of the sensor proved to be substantially lower than the values determined from magnetic measurements. This difference was accounted for by the formation of linear aggregates of magnetite nanoparticles under the action of a magnetic field.

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Authors and Affiliations

  1. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia

    A. L. Kovarskii, O. N. Sorokina & V. N. Gorshenev

  2. Mendeleev University of Chemical Technology, Miusskaya pl. 9, Moscow, 125820, Russia

    A. P. Tikhonov

Authors
  1. A. L. Kovarskii
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  2. O. N. Sorokina
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  3. V. N. Gorshenev
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  4. A. P. Tikhonov
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Additional information

Original Russian Text © A.L. Kovarskii, O.N. Sorokina, V.N. Gorshenev, A.P. Tikhonov, 2007, published in Zhurnal Fizicheskoi Khimii, 2007, Vol. 81, No. 2, pp. 364–371.

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Kovarskii, A.L., Sorokina, O.N., Gorshenev, V.N. et al. A study of magnetic liquids with the help of a paramagnetic sensor. Russ. J. Phys. Chem. 81, 301–307 (2007). https://doi.org/10.1134/S0036024407020264

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  • DOI: https://doi.org/10.1134/S0036024407020264

Keywords

  • Magnetite
  • Magnetite Nanoparticles
  • Spin Exchange
  • Spin Probe
  • Effective Magnetic Moment