Electrokinetic phenomena in a kerosene-based magnetic fluid

Zakinyan, Arthur; Vegera, Zh. G.; Борисенко, О. В.

doi:10.1134/s1063784212030176

Cited by 5 publications

(5 citation statements)

References 12 publications

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“…In this case, this requires stronger fields than those used in the experiments. It is also possible that, as indicated in [44], only a small part of the particles is charged. This complicates the detection of changes in the colloid concentration at the electrode with sufficient clarity.…”

Section: Resultsmentioning

confidence: 99%

“…It should be noted that the process of electrophoresis in magnetic fluids, in contrast to other colloidal systems, may have features associated with a stronger interaction of particles due to the forces of magnetic interaction of single-domain nanoparticles. Previously, the study of electrophoresis in magnetic fluids was carried out using a colloid based on kerosene [44]. In this work, the dependence of the concentration of particles at the electrode on time was obtained by taking into account the diffusion of particles using the equation for the particle flux caused by electrophoresis.…”

Section: Discussionmentioning

confidence: 99%

“…The origin of charged particles in non-polar solvents remains unclear. In some works, it is speculated that such systems contain a small fraction of both negatively and positively charged particles [39][40][41], while other researchers assume that initially the particles are not charged but can acquire a charge when they are near the electrodes [42][43][44].…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Magnetic Fields on Electrophoretic Processes in Magnetic Colloids with Different Stabilization Mechanisms

Dikansky,

Drozdov,

Eskova

et al. 2023

Magnetochemistry

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Electrophoretic nanostructuring is a promising approach for the creation of functional surfaces and active layers. The potency of this approach may be further enhanced by additional factors of various natures, such as magnetic fields. In this work, we have studied the process of electrophoresis in thin layers of water- and kerosene-based magnetic liquids and the effect of additional magnetic fields on the occurring processes. It was found that the electrophoresis process can be significantly affected by inhomogeneous magnetic fields. The possibility of compensating electrophoresis processes in such systems by means of inhomogeneous magnetic field influence was shown. Structural changes in magnetic colloids on hydrocarbon bases under the influence of an electric field have been studied. The role of electrohydrodynamic flows arising in this process is considered, and the influence of the magnetic field on the configuration of the formed labyrinth structure is studied. The dependence of the threshold value of the electric field strength corresponding to the emergence of the structure on the temperature and additionally applied magnetic field has been established. The obtained results could contribute to the development of an original method for determining the charge and magnetic moment of a single nanoparticle.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Influence of Magnetic Fields on Electrophoretic Processes in Magnetic Colloids with Different Stabilization Mechanisms

Dikansky,

Drozdov,

Eskova

et al. 2023

Magnetochemistry

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“…According to reviews [12,34], the electrical conductivity in MF is due to several mechanisms, including the presence of impurity ions appearing in the MF during its synthesis. In addition, colloidal magnetic particles can also transfer charge [35,36].…”

Section: Charge Transfer In Mfmentioning

confidence: 99%

Experimental and Theoretical Study of an Autowave Process in a Magnetic Fluid

Chekanov

Коваленко

2022

IJMS

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Magnetic fluid (MF) is a colloidal system consisting of ferromagnetic particles (magnetite) with a diameter of ~10 nm suspended in a dispersion medium of a carrier fluid (for example, kerosene). A distinctive feature of magnetic fluid is the fact that when an electric field is applied to it using two electrodes, thin layers consisting of close-packed particles of the dispersed phase are formed in the regions near the surface of both electrodes. These layers significantly affect the macroscopic properties of the colloidal system. In this work, the interpretation of the near-electrode layer is for the first time given as a new type of liquid membrane, in which the particles of the dispersed phase become charged with the opposite sign. On the basis of experimental studies, we propose a physicochemical mechanism of the autowave process in a cell with a magnetic fluid. It is based on the idea of oppositely recharging colloidal particles of magnetite in a liquid membrane. A mathematical model of an autowave process, which is described by a system of coupled partial differential equations of Nernst–Planck–Poisson and Navier–Stokes with appropriate boundary conditions, is proposed for the first time. One-dimensional, two-dimensional, and three-dimensional versions of the model are considered. The dependence of the frequency of concentration fluctuations on the stationary voltage between the electrodes was obtained, and the time of formation of a liquid membrane was estimated. Qualitative agreement between theoretical and experimental results has been established.

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“…Becoming negatively charged, each magnetite particle is surrounded by NH + 4 ions, forming an electric double layer [4], a fact experimentally proved by electrophoresis [9]. Consequently, the dielectric polarization of magnetic uids in a low frequency eld may be aected by the electric conductivity due to the ions from the surface of particles and/or due to the free ions in the carrier liquid.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Low Frequency Polarization Mechanisms in Magnetic Fluids

2013

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The dielectric behaviour of a magnetic uid with magnetite particles dispersed in kerosene was analyzed. Therefore, the frequency (f ) and temperature (T ) dependences of the complex dielectric permittivity, ε(f, T ), over the ranges 4 kHz to 2 MHz and 25• C to 90• C were measured. Based on the experimental results of ε(f, T ) and using the ClausiusMossotti equation, we have determined the temperature dependence of the real part of the total polarizability α , of a magnetic uid. The computations have taken into account that the magnetic uid consists of three components, namely magnetite particles, surfactant, and carrier liquid. The results show that at a given frequency, α increases with temperature in the low frequency range (4 kHz to 100 kHz) and decreases with temperature above 100 kHz. This behaviour demonstrates that in low frequency range the polarization mechanism related to the deformation of the counter ions atmosphere around each particle is predominant and above 100 kHz the orientation of the dipole moments is the main polarization mechanism of the magnetic uid. These measurements enabled the evaluation of the eective dipole moment of the magnetic uid, in order of 1.21 × 10 −30 C m.

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Electrokinetic phenomena in a kerosene-based magnetic fluid

Cited by 5 publications

References 12 publications

The Influence of Magnetic Fields on Electrophoretic Processes in Magnetic Colloids with Different Stabilization Mechanisms

The Influence of Magnetic Fields on Electrophoretic Processes in Magnetic Colloids with Different Stabilization Mechanisms

Experimental and Theoretical Study of an Autowave Process in a Magnetic Fluid

Investigation of the Low Frequency Polarization Mechanisms in Magnetic Fluids

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