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Effect of a homogeneous magnetic field on the electrospraying characteristics of sulfolane ferrofluids

  • Aaron Madden (a1), Juan Fernandez de la Mora (a1), Nirmesh Jain (a2), Hadi Sabouri (a2) and Brian Hawkett (a2)...
Abstract

We explore the effect of an applied homogeneous magnetic field on the electrospraying characteristics of a ferrofluid in the cone-jet mode. A sulfolane-based ferrofluid mixed with the ionic liquid ethyl ammonium nitrate has been synthesized. These mixtures have negligible volatility under ambient conditions and remain stable under a very wide range of electrical conductivities $K$ . Magnetized Taylor cones spray with the same current emission characteristics as their non-magnetized counterparts in the shared voltage and flow rate parameter space. However, the magnetized Taylor cones studied remained stable at voltages 23 % lower than the non-magnetized spray; they also access flow rates 30 % and 40 % lower in ferrofluids with $K=0.3$ and $0.01~\text{S}~\text{m}^{-1}$ . In the lower voltage ranges available only to magnetized tips, unusually long stable cones are observed. The magnetic stabilization mechanism responsible for these two effects remains unclear. It is noteworthy that these strong effects arise even when the tip curvature of the strictly magnetized liquid is orders of magnitude smaller than that for the strictly electrified liquid.

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Corresponding author
Email address for correspondence: juan.delamora@yale.edu
References
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Alonso-Matilla, R., Fernandez-Garcia, J., Congdon, H. & Fernandez de la Mora, J. 2014 Search for liquids electrospraying the smallest possible nanodrops in vacuo. J. Appl. Phys. 116 (22), 224504.
Bacri, J. C. & Salin, D. 1982 Instability of ferrofluid magnetic drops under magnetic field. J. Phys. Lett. Paris 43, L649L654.
Brancher, J. P. & Zouaoui, D. 1987 Equilibrium of a magnetic liquid drop. J. Magnetism & Magnetic Mats 65, 311314.
Bryce, N. S., Pham, B. T. T., Fong, N. W. S., Jain, N., Pan, E. H., Whan, R. M., Hambley, T. W. & Hawkett, B. S. 2013 The composition and end-group functionality of sterically stabilized nanoparticles enhances the effectiveness of co-administered cytotoxins. Biomaterials Sci. 1, 12601272.
Chen, D. R, Pui, D. Y. H. & Kaufman, S. L. 1995 Electrospraying of conducting liquids for monodisperse aerosol generation in the 4 nm to 1. 8 μm diameter range. J. Aero. Sci. 26 (6), 963977.
Cloupeau, M. & Prunet-Foch, B. 1989 Electrostatic spraying of liquids in cone-jet mode. J. Electrostat. 22, 135159.
Collins, R., Sambath, K., Harris, M. & Basaran, O. 2013 Universal scaling laws for the disintegration of electrified drops. Proc. Natl Acad. Sci. USA 110, 49054910.
Courtney, D. G., Li, H. Q. & Lozano, P. 2012 Emission measurements from planar arrays of porous ionic liquid ion source. J. Phys. D: Appl. Phys. 45 (48), 485203.
Fernandez de la Mora, J. 2007 The fluid dynamics of Taylor cones. Annu. Rev. Fluid Mech. 39, 217243.
Fernandez de la Mora, J. & Loscertales, I. G. 1994 The current transmitted through an electrified conical meniscus. J. Fluid Mech. 260, 155184.
Gamero-Castaño, M. 2010 Energy dissipation in electrosprays and the geometric scaling of the transition region of cone-jets. J. Fluid Mech. 662, 493513.
Gollwitzer, C., Matthies, G., Richter, R., Rehberg, I. & Tobiska, L. 2007 The surface topography of a magnetic fluid: a quantitative comparison between experiment and numerical simulation. J. Fluid Mech. 571, 455474.
Higuera, F. J. 2017 Qualitative analysis of the minimum flow rate of a cone-jet of a very polar liquid. J. Fluid Mech. 816, 428441.
Jain, N., Wang, Y., Hawkett, B. S. & Warr, G. G. 2011 Stable and water-tolerant ionic liquid ferrofluids. ACS Appl. Mater. Interface 3, 662667.
Jain, N., Wang, Y., Jones, S. K., Hawkett, B. S. & Warr, G. G. 2010 Optimized steric stabilization of aqueous ferrofluids and magnetic nanoparticles. Langmuir 26, 44654472.
King, L. B. 2014 Ferroelectrohydrodynamics of ionic liquid ferrofluid surface instabilities and jets. In 50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, Paper No. AIAA-2014-3693, pp. 2830. American Chemical Society.
King, L. B., Meyer, E., Hopkins, M. A., Hawkett, B. S. & Jain, N. 2014 Self-assembling array of magnetoelectrostatic jets from the surface of a superparamagnetic ionic liquid. Langmuir 30 (47), 1414314150.
Lavrova, O., Matthies, G., Mitkova, T., Polevikov, V. & Tobiska, L. 2006 Numerical treatment of free surface problems in ferrohydrodynamics. J. Phys. 18 (38), S2657S2669.
Ramos, A. & Castellanos, A. 1994 Conical points in liquid–liquid interfaces subjected to electric fields. Phys. Lett. A 184, 268272.
Rosell-Llompart, J. & Fernández de la Mora, J. 1994 Generation of monodisperse droplets 0. 3–4 μm in diameter from electrified cone-jets of highly conducting and viscous liquids. J. Aero. Sci. 25, 10931119.
Rowghanian, P., Meinhart, C. D. & Campàs, O. 2016 Dynamics of ferrofluid drop deformations under spatially uniform magnetic fields’. J. Fluid Mech. 802, 245262.
Sero-Guillaume, O. E., Zouaoui, D., Bernardin, D. & Brancher, J. P. 1992 The shape of a magnetic liquid drop. J. Fluid Mech. 241, 215232.
Stone, H. A., Lister, J. R. & Brenner, M. P. 1999 Drops with conical ends in electric and magnetic fields. Proc. R. Soc. Lond. A 455 (1981), 329347.
Tang, K. Q. & Gomez, A. 1995 Generation of monodisperse water droplets from electrosprays in a corona-assisted cone-jet mode. J. Colloid Interface Sci. 175 (2), 326332.
Tang, K., Gomez, A. & Fernandez de la Mora, J.1999 Electro-spray using corona assisted cone-jet mode. US Patent 5873523-A.
Taylor, G. I. 1964 Disintegration of water drops in an electric field. Proc. R. Soc. Lond. A 280, 383397.
Uehara, S., Itoga, T. & Nishiyama, H. 2015 Discharge and flow characteristics using magnetic fluid spikes for air pollution control. J. Phys. D 48, 282001.
Wohlhuter, F. K. & Basaran, O. A. 1992 Shapes and stability of pendant and sessile dielectric drops in an electric field. J. Fluid Mech. 235, 481510.
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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
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