Electrohydrodynamical instability of microdrops shapes in a magnetic fluid

Dikansky, Yuri; Nechaeva, O. A.

doi:10.1016/j.jmmm.2004.11.026

Cited by 10 publications

(11 citation statements)

References 2 publications

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“…It should be noted in conclusion that our result may lead to a more consistent pattern of electromagnetic phenomena in hydrocarbon based magnetic fluids and may help to obtain a more adequate description of electrical prop erties of such media. In particular, the results of this study can be applied for analyzing a number of inter esting effects observed in magnetic fluids and mani fested in the formation of ordered structures in such fluids under the action of the electric field; this effect was noted in a number of publications (see [17][18][19][20][21]). …”

Section: Discussionmentioning

confidence: 93%

Electrokinetic phenomena in a kerosene-based magnetic fluid

2012

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Section: Discussionmentioning

confidence: 93%

Electrokinetic phenomena in a kerosene-based magnetic fluid

2012

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“…[38][39][40] However, to the best of our knowledge, the combination of the fields has not been used to assemble bidirectional colloidal networks of superparamagnetic microspheres. The biggest advantage of this direct assembly method is the possibility of fine-tuning the assembly morphology by independently varying the electric and magnetic field intensities.…”

Section: Introductionmentioning

confidence: 99%

Multidirectional colloidal assembly in concurrent electric and magnetic fields

et al. 2016

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a Dipolar interactions between nano-and micron sized colloids lead to their assembly into domains with well-defined local order. The particles with a single dipole induced by an external field assemble into linear chains and clusters. However, to achieve the formation of multidirectionally organized nano-or microassemblies with tunable physical characteristics, more sophisticated interaction tools are needed.Here we demonstrate that such complex interactions can be introduced in the form of two independent, non-interacting dipoles (double-dipoles) within a microparticle. We show how this can be achieved by the simultaneous application of alternating current (AC)-electric field and uniform magnetic field to dispersions of superparamagnetic microspheres. Depending on their timing and intensity, concurrent electric and magnetic fields lead to the formation of bidirectional particle chains, colloidal networks, and discrete crystals. We investigate the mechanistic details of the assembly process, and identify and classify the non-equilibrium states formed. The morphologies of different experimental states are in excellent correlation with our theoretical predictions based on Brownian dynamics simulations combined with a structural analysis based on local energy parameters. This novel methodology of introducing and interpreting double-dipolar particle interactions may assist in the assembly of colloidal coatings, dynamically reconfigurable particle networks, and bidirectional active structures.

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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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Electrohydrodynamical instability of microdrops shapes in a magnetic fluid

Cited by 10 publications

References 2 publications

Electrokinetic phenomena in a kerosene-based magnetic fluid

Electrokinetic phenomena in a kerosene-based magnetic fluid

Multidirectional colloidal assembly in concurrent electric and magnetic fields

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

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