Orientational relaxation of ferromagnetic anisotropic colloidal particles in a magnetic fluid

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Abstract

Permalloy rod-shaped anisotropic nanoparticles were used to study orientational relaxation in polymethylsiloxane magnetic fluid. A magnetorheological effect was obtained at different magnitudes and frequencies of exposure to a magnetic field, and the time of structural relaxation after removal of the field was assessed.

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About the authors

Y. А. Filippova

Moscow State Pedagogical University; Lomonosov Moscow State University

Author for correspondence.
Email: yufi26@list.ru
Russian Federation, Moscow; Moscow

О. A. Yakusheva

Moscow State Pedagogical University

Email: yufi26@list.ru
Russian Federation, Moscow

A. V. Papugaeva

Moscow State Pedagogical University

Email: yufi26@list.ru
Russian Federation, Moscow

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2. Fig. 1. Photographs of the orientation of FeNi SNP aggregates in distilled water in a Nikon Eclipse LV100 optical microscope: without an external magnetic field (a), under the influence of a magnetic field (b).

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3. Fig. 2. Dynamic viscosity η as a function of angular frequency ω for samples with SNPs of different lengths: 9 (a), 6 (b), and 1.3 μm (c). The magnetic field strength B varied from 0 to 1 T. Comparison of initial viscosity values ​​for samples with different degrees of anisotropy at B = 0 T (d). The mass concentration of SNPs is 0.25%.

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4. Fig. 3. Dynamic viscosity η as a function of angular frequency ω for a sample with 9 μm long SLFs at two mass concentrations: 0.25 (a) and 0.5 wt.% (b). The magnetic field strength B varied from 0 to 1 T.

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5. Fig. 4. Dependence of dynamic viscosity on the magnetic field strength at a frequency of ω = 0.05 s-1 for SNPs of 9 μm length and two values ​​of SNP concentration.

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6. Fig. 5. Dependence of the dynamic viscosity η of MF on the angular frequency ω for a sample with SNPs of 1.3 μm length: without applying a magnetic field, at B = 0.25 T, after removing the magnetic field: after 2 and 30 min. Mass. content of SNPs% = 0.25.

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7. Fig. 6. Dependence of ln(η(t) - η∞) on time t.

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