Measurement of Complex Permittivity of Oil-Based Ferrofluid in Magnetic Field

• Authors: J. Kúdelčík , Š. Hardoň , L. Varačka
• Languages of publication: EN

Abstracts

EN

The changes of dielectric parameters in oil-based ferrofluid have been measured in an external magnetic field. The frequency dependent real permittivity and the dissipation factor were measured within the frequency ranges from 1 mHz to 2 MHz by a capacitance method. These parameters have been studied in combined electric and magnetic field, when fields were parallel and perpendicular. The Cole-Cole model has been used to analyze measured data. When a magnetic field was applied, the interaction between the magnetic field and magnetic moments of nanoparticles led to the aggregation of magnetic nanoparticles to new structures - thick chains which had influence on the value of dielectric permittivity. At constant magnetic field the dependence of real permittivity and tanδ on angle between the electric and magnetic field (anisotropy) were measured, too. The various influences of magnetic field development on the investigated liquid are discussed.

Keywords

EN

47.65.Cb; 77.22.Gm; 77.22.Ch

Discipline

• 77.22.Gm: Dielectric loss and relaxation
• 47.65.Cb: Magnetic fluids and ferrofluids
• 77.22.Ch: Permittivity (dielectric function)(for low-permittivity dielectric films, see 77.55.Bh; for high-permittivity gate dielectric films, 77.55.D-)

• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 931-933

Dates

published

2017-04

Contributors

author

J. Kúdelčík

• Department of Physics, University of Žilina, Univerzitná 1, 010 01 Žilina, Slovakia

author

Š. Hardoň

• Department of Physics, University of Žilina, Univerzitná 1, 010 01 Žilina, Slovakia

author

L. Varačka

• Department of Physics, University of Žilina, Univerzitná 1, 010 01 Žilina, Slovakia

References

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Identifiers

DOI

10.12693/APhysPolA.131.931