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A magnetic fluid for operation in strong gradient fields

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Abstract

The properties of a magnetic fluid based on colloidal magnetite and VM-3 vacuum oil have been experimentally studied. The fluid is designed for a long-term operation in strong gradient magnetic fields. A variant of magneto-granulometric analysis has been proposed that makes it possible to determine the average magnetic moment, variance of magnetic moments, and number density of particles with no a priori assumptions of the particle size distribution. Magneto-granulometric and cluster analyses of the magnetic fluid have been carried out. It has been shown that individual particles with an average diameter of the magnetic core of 7 nm, which is markedly smaller than those in common commercial fluids, prevail in the studied solution. The volume concentration of multiparticle clusters is also low; their total contribution to the initial magnetic susceptibility of the fluid only slightly exceeds 3%. The small particle sizes and the low cluster concentration provide the colloidal solution with a high stability in a strong magnetic field and a centrifugal force field at a rather high saturation magnetization of the solution.

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Authors and Affiliations

  1. Institute of Mechanics of Continua, Ural Branch, Russian Academy of Sciences, ul. Akademika Koroleva 1, Perm, 614013, Russia

    A. F. Pshenichnikov & A. V. Lebedev

  2. OOO NPVP Ferrogidrodinamika, ul. Bol’shaya Morskaya 45/5, Nikolaev, 54030, Ukraine

    A. V. Radionov

  3. Perm National Research University, ul. Bukireva 15, Perm, 614090, Russia

    D. V. Efremov

Authors
  1. A. F. Pshenichnikov
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  2. A. V. Lebedev
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  3. A. V. Radionov
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  4. D. V. Efremov
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Correspondence to A. F. Pshenichnikov.

Additional information

Original Russian Text © A.F. Pshenichnikov, A.V. Lebedev, A.V. Radionov, D.V. Efremov, 2015, published in Kolloidnyi Zhurnal, 2015, Vol. 77, No. 2, pp. 207–213.

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Pshenichnikov, A.F., Lebedev, A.V., Radionov, A.V. et al. A magnetic fluid for operation in strong gradient fields. Colloid J 77, 196–201 (2015). https://doi.org/10.1134/S1061933X15020155

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  • DOI: https://doi.org/10.1134/S1061933X15020155

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