Deformation of magnetosensitive emulsion microdroplets in magnetic and electric fields

Dikanskii, Yu. I.; Nechaeva, O. A.; Zakinyan, Arthur

doi:10.1134/s1061933x06020037

Cited by 11 publications

(15 citation statements)

References 4 publications

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“…Up to now, non-spherical structures have been obtained by squeezing particle-coated air bubbles [16] and oil droplets between glass slides and through a glass capillary [14] or elongating them in sheared particle-stabilized emulsions [15]. These findings suggest that droplets or bubbles can also be shaped into tailored anisotropic geometries [9,[14][15][16][22][23][24][25][26][27][28][29][30]. Furthermore, these significant works offer us an effective method to produce non-spherical droplets.…”

Section: Introductionmentioning

confidence: 91%

Temperature induced formation of particle coated non-spherical droplets

Tan

Zhang

Wang

et al. 2011

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 91%

Temperature induced formation of particle coated non-spherical droplets

Tan

Zhang

Wang

et al. 2011

Journal of Colloid and Interface Science

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“…The main idea of constructing such a model is to study the question of the possibility of the occurrence of autowave motion due to the recharging of MF particles near the electrodes or in the regions of localization of the space charge. The model is described by a boundary-value problem, which consists of a research area (Figure 6), a system of equations (6)(7)(8)(9)(10)(11)(12), and initial and boundary conditions (13)(14)(15)(16)(17)(18)(19)(20). When constructing the model, the following assumptions were made:…”

Section: Basic Equations Of the Modelmentioning

confidence: 99%

“…For example, when a cell with magnetic fluid is illuminated with light with a wide spectrum of wavelengths in an electric field, we see a change in the color of the electrode surface, which is explained by a shift in the spectrum maximum due to the formation of a near-electrode layer of particles and an increase in the optical thickness of the layer [18]. Labyrinth structures of ordered microdroplet aggregates are formed in a thin layer of a magnetic colloid [19]. In an electric field, the transparency of the magnetic colloid changes [20] and layers of close-packed particles of the dispersed phase are formed at the interface with the electrodes (the concentration of particles in the layer is ~27% vol., or 0.74•10 −2 mol•m −3 ) [21-24] (Figure 2).…”

Section: Introductionmentioning

confidence: 96%

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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“…3,4,[24][25][26][27][28][29][30][31][32] Electrohydronamically stressed conducting and polar liquids have received even more attention due to their wide technical utility in the field of electrospray. 10,[33][34][35] There has been some limited work on combined electric/magnetic fluids, mostly studies of equilibrium droplet shapes under combined field stress for instance by Tyatushkin, 36 Dikansky,37,38 and Zakinyan. 39 The flow of a weakly electric and magnetic fluid was addressed by Tzirtzilakis in the context of biofluid dynamics.…”

Section: Introductionmentioning

confidence: 99%

Wavelength measurements of Rosensweig instabilities in a ferrofluid in a non-uniform magnetic field

Meyer¹,

King²

2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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A suitably strong electric field, applied at the free surface of a conducting or even dielectric fluid, will exert electrostatic traction on the fluid surface that can stretch the meniscus into a pointed conical shape. 1 Electrospray results when the field is strong enough to cause the tip of this 'Taylor cone' to exhaust a jet of charged droplets or ions. 2 By exact analogy with electrostatically stressed dielectric fluids, magnetic fields can distort magnetizable fluids into identical pointed geometries, 3,4 however magnetostatic jetting is never observed. 5 It is believed, yet not completely understood, that electrostatic jetting is a result of finite charge conductivity, a phenomenon which has no parallel in the magnetic fluid. Recently Meyer and King have shown that it is possible to induce hybrid electromagnetostatic jets by exciting surface instabilities in a novel electrically conductive superparamagnetic liquid. 6,7 When this fluid is subjected to simultaneous magnetic and electric fields a self-assembling array of discrete and stable cone-shaped emitters forms spontaneously in the fluid surface. While electrohydrodynamic flows, ferrohydrodynamic flows, and magnetohydrodynamic flows have long been studied separately, the ionic liquid ferrofluid described by Meyer and King is the first liquid to simultaneously respond strongly to electrostatic, magnetostatic, and Lorentz stresses, requiring a unification of EHD/FHD/MHD fluid physics. The purpose of this paper is to begin an analytic description of the fluid mechanics encountered when electromagnetically stimulating a highly conductive ferrofluid to produce spray. A potential energy analysis is used to describe the formation of the emitting cone. A linear stability analysis is performed on the resulting jet, showing that magnetic effects can radically shift the stability bounds of an electrospray.

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Deformation of magnetosensitive emulsion microdroplets in magnetic and electric fields

Cited by 11 publications

References 4 publications

Temperature induced formation of particle coated non-spherical droplets

Temperature induced formation of particle coated non-spherical droplets

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

Wavelength measurements of Rosensweig instabilities in a ferrofluid in a non-uniform magnetic field

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