Elongation of confined ferrofluid droplets under applied fields

Details Elongation of confined ferrofluid droplets under applied fields Elongation of confined ferrofluid droplets under applied fields

1999-04-13

arxiv.org/abs/cond-mat/9904189v1

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 7 figures. Submitted to Phys. Rev. E

Scientific paper

10.1103/PhysRevE.60.4272

Ferrofluids are strongly paramagnetic liquids. We study the behavior of ferrofluid droplets confined between two parallel plates with a weak applied field parallel to the plates. The droplets elongate under the applied field to reduce their demagnetizing energy and reach an equilibrium shape where the magnetic forces balance against the surface tension. This elongation varies logarithmically with aspect ratio of droplet thickness to its original radius, in contrast to the behavior of unconfined droplets. Experimental studies of a ferrofluid/water/surfactant emulsion confirm this prediction.

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