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Rigoni C, Pierno M, Mistura G, et al. Static Magnetowetting of Ferrofluid Drops. Langmuir. 2016;32(30):7639-46doi: 10.1021/acs.langmuir.6b01934.
Rigoni, C., Pierno, M., Mistura, G., Talbot, D., Massart, R., Bacri, J. C., & Abou-Hassan, A. (2016). Static Magnetowetting of Ferrofluid Drops. Langmuir : the ACS journal of surfaces and colloids, 32(30), 7639-46. https://doi.org/10.1021/acs.langmuir.6b01934
Rigoni, Carlo, et al. "Static Magnetowetting of Ferrofluid Drops." Langmuir : the ACS journal of surfaces and colloids vol. 32,30 (2016): 7639-46. doi: https://doi.org/10.1021/acs.langmuir.6b01934
Rigoni C, Pierno M, Mistura G, Talbot D, Massart R, Bacri JC, Abou-Hassan A. Static Magnetowetting of Ferrofluid Drops. Langmuir. 2016 Aug 02;32(30):7639-46. doi: 10.1021/acs.langmuir.6b01934. Epub 2016 Jul 20. PMID: 27385506.
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Langmuir. 2016 Aug 02;32(30):7639-46. doi: 10.1021/acs.langmuir.6b01934. Epub 2016 Jul 20.

Static Magnetowetting of Ferrofluid Drops.

Langmuir : the ACS journal of surfaces and colloids

Carlo Rigoni, Matteo Pierno, Giampaolo Mistura, Delphine Talbot, René Massart, Jean-Claude Bacri, Ali Abou-Hassan

Affiliations

  1. Dipartimento di Fisica e Astronomia G. Galilei, Università di Padova , via Marzolo 8, 35131 Padova, Italy.
  2. Sorbonne Universités, UPMC Univ Paris 06, Laboratoire Physico-chimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), UMR 8234 CNRS, 4 Place Jussieu, 75005 Paris, France.
  3. Laboratoire Matière et Systèmes Complexes (MSC), UMR 7057, CNRS and Université Paris Diderot, 75205 Paris, France.

PMID: 27385506 DOI: 10.1021/acs.langmuir.6b01934

Abstract

We report results of a comprehensive study of the wetting properties of sessile drops of ferrofluid water solutions at various concentrations deposited on flat substrates and subjected to the action of permanent magnets of different sizes and strengths. The amplitude and the gradient of the magnetic field experienced by the ferrofluid are changed by varying the magnets and their distance to the surface. Magnetic forces up to 100 times the gravitational one and magnetic gradients up to 1 T/cm are achieved. A rich phenomenology is observed, ranging from flattened drops caused by the magnetic attraction to drops extended normally to the substrate because of the normal traction of the magnetic field. We find that the former effect can be conveniently described in terms of an effective Bond number that compares the effective drop attraction with the capillary force, whereas the drop's vertical elongation is effectively expressed by a dimensionless number S, which compares the pressure jump at the ferrofluid interface because of the magnetization with the capillary pressure.

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