MULTIPLE SCISSIONS OF IONIC FERROFLUID DROPS

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Abstract
A drop of ionic ferrofluid, strongly magnetic (μ ∼ 40), exhibits an instability when it is confined between two parallel boundaries perpendicular to the magnetic field direction. Increasing the magnetic field, the drop successively undergoes a deformation, develops pointed feet and splits into two smaller droplets. We present a model of ellipsoidal shapes to account for the magnetic thresholds of deformation and scissions. It is possible to observe eight successive scissions of a single initial drop leading to 256 smaller droplets which arrange themselves in a regular hexagonal array similar to a two dimensional crystal the long-range order of which is optically tested.

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