Drops deformation and magnetic permeability of a ferrofluid emulsion

Zakinyan, Arthur; Dikansky, Yuri

doi:10.1016/j.colsurfa.2011.03.018

Cited by 38 publications

(28 citation statements)

References 15 publications

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“…In the anisotropic effective medium approximation [18,22] the emulsion specific conductivity will be determined by the following set of equations, of the Figure 9. Let us consider that this approximating dependence may be adequately extrapolated at least to the 15% concentration of emulsion, as shown in Figure 9.…”

Section: Analysis Of Resultsmentioning

confidence: 99%

Electrical Properties of Chain Microstructure Magnetic Emulsions in Magnetic Field

Zakinyan

Dikansky

Bedzhanyan

2013

Journal of Dispersion Science and Technology

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Abstract. The work deals with the experimental study of the emulsion whose dispersion medium is a magnetic fluid while the disperse phase is formed by a glycerin-water mixture. It is demonstrated that under effect of a magnetic field chain aggregates form from the disperse phase drops. Such emulsion microstructure change affects its macroscopic properties. The emulsion dielectric permeability and specific electrical conductivity have been measured.It is demonstrated that under the effect of relatively weak external magnetic fields (~ 1 kA/m) the emulsion electrical parameters may change several fold.The work theoretically analyzes the discovered regularities of the emulsion electrical properties.

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Section: Analysis Of Resultsmentioning

confidence: 99%

Electrical Properties of Chain Microstructure Magnetic Emulsions in Magnetic Field

Zakinyan

Dikansky

Bedzhanyan

2013

Journal of Dispersion Science and Technology

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“…Magnetic droplets can be prepared in various ways. The most common method is to disperse a magnetic fluid in an immiscible liquid (Zakinyan & Dikansky 2011). Recently an interesting system was used where drops in glycerin were formed by magnetic nanoparticles with a biocompatible polydimethylsiloxane (PDMS) coating without a carrying liquid (Afkami et al 2010).…”

Section: Preparation Of Magnetic Dropletsmentioning

confidence: 99%

Magnetic micro-droplet in rotating field: numerical simulation and comparison with experiment

et al. 2017

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Magnetic droplets obtained by induced phase separation in a magnetic colloid show a large variety of shapes when exposed to an external field. However, the description of shapes is often limited. Here we formulate an algorithm based on three dimensional boundary-integral equations for strongly magnetic droplets in a high-frequency rotating magnetic field, allowing us to find their figures of equilibrium in three dimensions. The algorithm is justified by a series of comparisons with known analytical results. We compare the calculated equilibrium shapes with experimental observations and find a good agreement. The main features of these observations are the oblate-prolate transition, the flattening of prolate shapes with the increase of magnetic field strength and the formation of star-fish like equilibrium shapes. We show both numerically and in experiments that the magnetic droplet behaviour may be described with a tri-axial ellipsoid approximation. Directions for further research are mentioned, including the dipolar interaction contribution to the surface tension of the magnetic droplets, account for the large viscosity contrast between the magnetic droplet and the surrounding fluid.

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“…Note that Eqs. (6) and (7) define θ E and θ H and are valid for an arbitrary orthotropic drop, whereas Eqs. (10) and (11) and (21) and (22) determine θ E and θ H only for the case of small deformations of the drops.…”

Section: A Single Drop Of the Dispersed Phasementioning

confidence: 99%

“…Drops of the dispersed phase of such emulsions form various structures under action of sufficiently strong magnetic fields [1][2][3][4][5]. Under action of magnetic fields with lower intensity magnitude, the drops deform, elongating along the intensity vector (see, e.g., [6]). Electric fields [7], hydrodynamic flows [8], and confined geometry [9] influence the deformation of the drops in magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of magnetic emulsions induced by magnetic and electric fields

2011

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The anisotropy of magnetic emulsions induced by simultaneously acting electric and magnetic fields is theoretically and experimentally investigated. Due to the anisotropy, the electric conductivity and magnetic permeability of a magnetic emulsion are no longer scalar coefficients, but are tensors. The electric conductivity and magnetic permeability tensors of sufficiently diluted emulsions in sufficiently weak electric and magnetic fields are found as functions of the electric and magnetic intensity vectors. The theoretically predicted induced anisotropy was verified experimentally. The experimental data are fitted in order to calculate the dimensions of the ellipsoidal drops of the emulsion distorted by the electric and magnetic fields. The dependence of the calculated fitting parameter on the intensity of the magnetic field is compared with the theoretical one. The results of the analysis of the experimental data are discussed.

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Drops deformation and magnetic permeability of a ferrofluid emulsion

Cited by 38 publications

References 15 publications

Electrical Properties of Chain Microstructure Magnetic Emulsions in Magnetic Field

Electrical Properties of Chain Microstructure Magnetic Emulsions in Magnetic Field

Magnetic micro-droplet in rotating field: numerical simulation and comparison with experiment

Anisotropy of magnetic emulsions induced by magnetic and electric fields

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