Electric field mediated droplet centering

Bei, Z.-M.; Jones, T. B.; Tucker-Schwartz, A.; Harding, D. R.
November 2008
Applied Physics Letters;11/3/2008, Vol. 93 Issue 18, p184101
Academic Journal
Double emulsion droplets subjected to a uniform ac electric field self-assemble into highly concentric structures via the dipole/dipole force if the outer droplet has a higher dielectric constant than the suspending liquid. The dielectric constant of the inner droplet has no influence. To minimize field-induced droplet distortion, the liquids must be density matched to ∼0.1%. Centering of ∼3 to 6 mm diameter droplets is achieved within ∼60 s for field strengths of ∼104 Vrms/m in liquids of viscosity ∼10 cP. Effective centering depends strongly on frequency if the outer shell is conductive.


Related Articles

  • Faster electro-optical response characteristics of a carbon-nanotube-nematic suspension. Hui-Yu Chen; Wei Lee; Clark, Noel A. // Applied Physics Letters;1/15/2007, Vol. 90 Issue 3, p033510 

    The response times of rotational molecular orientation of neat and carbon-nanotube-doped nematic liquid crystals were acquired through the measurement of transient current induced by a direct-current step voltage and from optical transmission data. A model based on the dielectric displacement...

  • High Stable Water-oil Emulsions Dewatering with High-frequency and Super-high-frequency Electromagnetic Fields. Zinnatullin, R. R.; Fatkhullina, Yu. I. // Oil & Gas Technologies;2012, Vol. 78 Issue 1, p24 

    Physical principle and possibility of high-frequency and super-high-frequency electromagnetic fields application to high stable water-oil emulsions and oil sludge dewatering is proved. A research results on relation between frequency and dielectric loss tangent for some model and real water-oil...

  • Switching and characteristic dielectric parameters of a room temperature antiferroelectric liquid crystal mixture. Kumar, Anil; Dhar, R.; Agrawal, V. K.; Dabrowski, R.; Tykarska, M. // Journal of Applied Physics;Sep2008, Vol. 104 Issue 5, p054104 

    The switching and dielectric properties of a room temperature bicomponent antiferroelectric liquid crystal mixture have been investigated as a function of temperature and frequency. Thermodynamic, optical texture, and dielectric studies carried out on the mixture show the phase sequence of...

  • Response of an emulsion of leaky dielectric drops immersed in a simple shear flow: Drops less conductive than the suspending fluid. Fernández, Arturo // Physics of Fluids;Apr2008, Vol. 20 Issue 4, p043304 

    Direct numerical simulations of the effects of an electric field on an emulsion of drops are presented. A simple shear flow configuration is adopted where the electric field is applied perpendicular to the sliding plates. Both the drops and the suspending fluid are assumed to behave as leaky...

  • Nonlinear stability of a charged electrified viscous liquid sheet under the action of a horizontal electric field. Ozen, O.; Papageorgiou, D. T.; Petropoulos, P. G. // Physics of Fluids;Apr2006, Vol. 18 Issue 4, p042102 

    In a recent paper [D. T. Papageorgiou and P. G. Petropoulos, J. Eng. Math. 50, 223 (2004)] we considered the linear stability of a two-dimensional incompressible leaky dielectric viscous liquid sheet surrounded by a hydrodynamically passive conducting medium, when an electric field is applied...

  • Viscosity of a Suspension with Internal Rotation. Elisabeth, Lemaire; Laurent, Lobry; François, Peters // AIP Conference Proceedings;7/7/2008, Vol. 1027 Issue 1, p746 

    When an insulating particle immersed into a low conducting liquid is submitted to a sufficiently high DC field, E, it can rotate spontaneously around itself along any axis perpendicular to the electric field. This symmetry break is known as Quincke rotation and could have important consequences...

  • Conical tips inside cone-jet electrosprays. Marín, Álvaro G.; Loscertales, Ignacio G.; Barrero, A. // Physics of Fluids;Apr2008, Vol. 20 Issue 4, p042102 

    In coaxial jet electrosprays inside liquid baths, a conductive liquid forms a cone-jet electrospray within a bath containing a dielectric liquid. An additional dielectric liquid is injected inside the Taylor cone, forming a liquid meniscus. The motion of the conductive liquid that flows toward...

  • Quantitative characterization of the viscosity of a microemulsion. Berg, Robert F.; Moldover, Michael R.; Huang, John S. // Journal of Chemical Physics;9/15/1987, Vol. 87 Issue 6, p3687 

    We have measured the viscosity of the three-component microemulsion water/decane/AOT as a function of temperature and droplet volume fraction. At temperatures well below the phase-separation temperature the viscosity is described by treating the droplets as hard spheres suspended in decane. Upon...

  • Electrorheological effect in the nematic phase of 4-n-pentyl-4′-cyanobiphenyl. Negita, Keishi // Journal of Chemical Physics;11/1/1996, Vol. 105 Issue 17, p7837 

    Rheological properties in the nematic phase of 5CB (4-n-pentyl-4′-cyanobiphenyl) are investigated under applications of electric fields. When an electric field of a few kV mm-1 is applied, an increase in the apparent viscosity is observed with its amount being saturated at higher electric...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics