On the permeability of a magnetodielectric emulsion

Dikanskii, Yu. I.; Zakinyan, Arthur; Konstantinova, N. Yu.

doi:10.1134/s1063784208010040

Cited by 6 publications

(16 citation statements)

References 1 publication

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“…The dependence of the magnetic permeability of ferrofluid emulsions on the external magnetic field strength is illustrated in Fig. 2 in comparison with the experimental data [7]. Two emulsions with different volume fractions of ferrofluid droplets were studied: ϕ = 0.2 and 0.35.…”

Section: Resultsmentioning

confidence: 95%

“…Recently, such nonmonotonic field dependence of the magnetic permeability has been experimentally reported [7] for ferrofluid emulsions (Fig. 2, experimental dots) produced by dispersing a kerosene-based ferrofluid in immiscible aviation oil.…”

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confidence: 73%

“…The numerical solution of the set of equations (3), (5), (7), and (10) gives us, first, the degree of the droplet elongation induced by the applied magnetic field. The calculated typical ellipticity (long-to-short semi-axis ratio) is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Field dependence of the magnetic permeability of ferrofluid emulsion. Experimental data [7] are presented for the emulsions with the droplet volume fraction ϕ = 0.2 (boxes) and 0.35 (circles). Theoretical predictions are shown by lines for the same emulsions.…”

Section: Modelmentioning

confidence: 99%

“…The maximum value of the effective emulsion permeability increases with the volume concentration ϕ of the droplets. During measurements, the coalescence of the droplets was not experimentally observed [7]. The correct theoretical description of this nonmonotonic dependence needs a solution of the droplet elongation problem with account for the nonlinear magnetization of the droplet.…”

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confidence: 99%

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The effects of magnetic felds on the properties of ferrofluids and ferrogels

Camp¹

2011

MHD

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Experimental study of the static magnetic properties of ferrofluid emulsions has demonstrated the nonmonotonic field dependence of the emulsion magnetic permeability. In a weak magnetic field, the emulsion permeability rapidly grows and reaches a maximum, and then it decreases slowly in stronger fields. We suggest a theoretical description of the effect based on the following idea. The weak field growth of the emulsion magnetic permeability is caused by the droplet elongation and the resulting reduction of demagnetizing field under the constant value of the ferrofluid magnetic susceptibility. Subsequent decrease of the emulsion magnetic permeability in a stronger magnetic field is explained by the decay of the ferrofluid magnetic susceptibility under an approximately constant degree of droplet elongation.

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Section: Resultsmentioning

confidence: 95%

mentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Section: Modelmentioning

confidence: 99%

mentioning

confidence: 99%

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The effects of magnetic felds on the properties of ferrofluids and ferrogels

Camp¹

2011

MHD

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Magnetic permeability of inverse ferrofluid emulsion: Nonlinear ferrofluid magnetization law

Subbotin

2020

Journal of Magnetism and Magnetic Materials

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Nonmonotonic field-dependent magnetic permeability of a paramagnetic ferrofluid emulsion

Иванов

Kuznetsova

2012

Phys. Rev. E

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The ferrofluid emulsion, made of kerosene-based ferrofluid droplets suspended in nonmiscible aviation oil, demonstrates experimentally the nonmonotonic dependence of the effective magnetic permeability as a function of the uniform static magnetic field. In weak fields the emulsion permeability rapidly grows; it reaches its maximum at fields on the order of 1 kA/m; after that, it decays to zero. The theoretical explanation of the effect, as we show here, could be based on the following idea: In a weak magnetic field the growth of the induced droplet magnetic moment is faster than the linear one due to the droplet elongation accompanied by the reduction of the demagnetizing field. Further increase of the external magnetic field strength cannot lead to a significant decrease of the demagnetizing field, as the droplets are already highly elongated. On the other hand, the magnetic susceptibility of the ferrofluid reduces with the field strength. Thus, the effective magnetic permeability of the ferrofluid suspension starts decreasing. The developed theoretical model describes well the experimental observations.

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On the permeability of a magnetodielectric emulsion

Cited by 6 publications

References 1 publication

The effects of magnetic felds on the properties of ferrofluids and ferrogels

The effects of magnetic felds on the properties of ferrofluids and ferrogels

Magnetic permeability of inverse ferrofluid emulsion: Nonlinear ferrofluid magnetization law

Nonmonotonic field-dependent magnetic permeability of a paramagnetic ferrofluid emulsion

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