Electrical Properties of Chain Microstructure Magnetic Emulsions in Magnetic Field

Zakinyan, Arthur; Dikansky, Yuri; Bedzhanyan, M. A.

doi:10.1080/01932691.2013.769109

Cited by 13 publications

(6 citation statements)

References 21 publications

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“…Exposure to an external magnetic field leads to a change in the microstructural state of the sample due to the association of ferrofluid droplets into chain structures (figure 2(b)). A distinctive feature of this emulsion from those previously synthesized and studied in other works [24][25][26][27][28][29][30] is the simultaneous presence of high magnetic and dielectric properties of the dispersed phase.…”

Section: Methodsmentioning

confidence: 79%

Absorption spectrum of magnetically structured emulsions in the centimeter range

Turkin,

Zakinyan,

Bozhenko

2024

Phys. Scr.

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The high degree of absorption of microwave radiation by composite materials with developed morphology can be significantly improved by directly changing the geometrical parameters of the subwavelength structure, which is difficult in the case of solid-state materials. In this work, a new composite liquid material with controlled absorption properties, a magnetodielectric emulsion, is investigated. The control of microgeometry parameters is accomplished through exposure to a magnetic field. The experimental studies have shown that the formation of chain structures from spherical water droplets in the composite leads to a significant change in the absorption coefficient. Thus, for an emulsion with 10% water content, exposure to a magnetic field of 25 kA/m increases the absorption coefficient by 400% at a radiation frequency of 10 GHz. It is noteworthy that the efficiency of the absorption properties control depends on the volume concentration of droplets in the sample and has a non-monotonic character. To interpret the obtained results, numerical modeling of the studied system in the effective medium approximation was carried out.

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Section: Methodsmentioning

confidence: 79%

Absorption spectrum of magnetically structured emulsions in the centimeter range

Turkin,

Zakinyan,

Bozhenko

2024

Phys. Scr.

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“…Refs. [48,49]), the formation of chained structures of ferrofluid droplets, [50] and the effect of these structures on the emulsion electrical properties [51]. Finally, it is worth mentioning the recent work of Zakinyan and Zakinyan [52] who succeed on producing an emulsion of ferrofluid microdrops using a rotating magnetic field and showed that the resulting magnetic torque of the emulsion can be enhanced with respect that observable in the pure ferrofluid.…”

Section: Introductionmentioning

confidence: 98%

Shear rheology of a dilute emulsion of ferrofluid droplets dispersed in a nonmagnetizable carrier fluid under the influence of a uniform magnetic field

Capobianchi

Lappa

Oliveira

et al. 2021

Journal of Rheology

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The effect of a spatially uniform magnetic field on the shear rheology of a dilute emulsion of monodispersed ferrofluid droplets, immersed in a non-magnetizable immiscible fluid, is investigated using direct numerical simulations. The direction of the applied magnetic field is normal to the shear flow direction. The droplets extra stress tensor arising from the presence of interfacial forces of magnetic nature is modeled on the basis of the seminal work of G. K. Batchelor, J. Fluid Mech., 41.3 (1970) under the assumptions of a linearly magnetizable ferrofluid phase and negligible inertia. The results show that even relatively small magnetic fields can have significant consequences on the rheological properties of the emulsion due to the magnetic forces that contribute to deform and orient the droplets towards the direction of the applied magnetic vector. In particular, we have observed an increase of the effective (bulk) viscosity and a reversal of the sign of the two normal stress differences with respect to the case without magnetic field for those conditions where the magnetic force prevails over the shearing force. Comparisons between the results of our model with a direct integration of the viscous stress have provided an indication of its reliability to predict the effective viscosity of the suspension. Moreover, this latter quantity has been found to behave as a monotonic increasing function of the applied magnetic field for constant shearing flows ("magneto-thickening" behaviour), which allowed us to infer a simple constitutive equation describing the emulsion viscosity.

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“…The cause of strong optical anisotropy may be the orientation of chain aggregates in a magnetic field (Fig. 8) [18][19][20][21].…”

Section: Resultsmentioning

confidence: 99%

Creation of a Magnetic Driven Gate for THZ Rays

Zyatkov¹,

Balashov²,

Yurchenko³

et al. 2019

PIER M

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In this paper, magnetic fluids based on iron oxide Fe 3 O 4 and 5BDSR alloy were obtained. Magnetic particles were obtained by nanosecond pulsed laser ablation. The preparation of the magnetic fluid was carried out by mechanical and ultrasonic stirring in a solution of polymethylphenylsiloxane. It is shown that under the influence of an external magnetic field, the spectral properties of the magnetic fluid of the 5BDSR alloy correspond to characteristics that can be used to create a magnetic gate.

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Electrical Properties of Chain Microstructure Magnetic Emulsions in Magnetic Field

Cited by 13 publications

References 21 publications

Absorption spectrum of magnetically structured emulsions in the centimeter range

Absorption spectrum of magnetically structured emulsions in the centimeter range

Shear rheology of a dilute emulsion of ferrofluid droplets dispersed in a nonmagnetizable carrier fluid under the influence of a uniform magnetic field

Creation of a Magnetic Driven Gate for THZ Rays

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