Generation of Fe₃O₄ Nanoparticle Aggregates in a Ferrofluid Driven by External Electric Field

• Authors: J. Kurimský , M. Rajňák , R. Cimbala , K. Paulovičová , M. Timko , P. Kopčanský , M. Kolcun , M. Kosterec , L. Kruželák
• Languages of publication: EN

Abstracts

EN

In the paper the experimental study of magnetic nanoparticle aggregation in a transformer oil based ferrofluid driven by an external electric field is reported. The studied ferrofluid was composed of the magnetite nanoparticles, oleic acid surfactant, and transformer oil. Generally, it is considered that superparamagnetic nanoparticles do not interact in the absence of external magnetic field. In the paper we present an experimental observation of the particle assembly formation in a direct current external electric field by optical microscopy. During the observation no external magnetic field was applied. A diluted low-polarity ferrofluid drop on a glass surface was exposed to the external static inhomogeneous electric field. It is assumed that induced dipole-dipole interaction and subsequent dielectrophoretic motion give rise to the electrohydrodynamic flow in the fluid after a certain time period. As a result, a visible particle chain was formed at the drop electrical equator. This demonstration is expected to contribute to the understanding of the streamer formation and electrical breakdown in transformer oil based ferrofluids.

Keywords

EN

47.57.J-; 47.65.Cb; 77.22.Jp; 77.22.Ch; 82.70.Dd

Discipline

• 82.70.Dd: Colloids
• 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-)
• 77.22.Jp: Dielectric breakdown and space-charge effects(for dielectric breakdown in gases, see 51.50.+v)
• 47.57.J-: Colloidal systems

• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 907-909

Dates

published

2017-04

Contributors

author

J. Kurimský

• Faculty of Electrical Engineering and Informatics, Technical University of Košice, Letná 9, 041 54 Košice, Slovakia

author

M. Rajňák

• Faculty of Electrical Engineering and Informatics, Technical University of Košice, Letná 9, 041 54 Košice, Slovakia
• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

R. Cimbala

• Faculty of Electrical Engineering and Informatics, Technical University of Košice, Letná 9, 041 54 Košice, Slovakia

author

K. Paulovičová

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

M. Timko

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

P. Kopčanský

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

M. Kolcun

• Faculty of Electrical Engineering and Informatics, Technical University of Košice, Letná 9, 041 54 Košice, Slovakia

author

M. Kosterec

• Faculty of Electrical Engineering and Informatics, Technical University of Košice, Letná 9, 041 54 Košice, Slovakia

author

L. Kruželák

• Faculty of Electrical Engineering and Informatics, Technical University of Košice, Letná 9, 041 54 Košice, Slovakia

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Identifiers

DOI

10.12693/APhysPolA.131.907