| Issue |
Matériaux & Techniques
Volume 90, 2002
Intelligent materials and structures
|
|
|---|---|---|
| Page(s) | 9 - 12 | |
| DOI | https://doi.org/10.1051/mattech/200290120009s | |
| Published online | 21 June 2017 | |
Micro cog-wheels induced by a magnetic instability by a magnetic instability in a microdrop of ferrofluid
1 Laboratoire des Milieux Désordonnés et Hétérogènes, Université Paris 6, case 78, 4 place Jussieu, 75252 Paris cedex 05, France
2 Université Paris 7, Unité de Formation et de Recherche de Physique, case 70.08, 2 place Jussieu, 75251 Paris cedex 05, France
3 Laboratoire des Liquides Ioniques et des Interfaces Chargées, Université Paris 6, case 0063, 4 place Jussieu, 75252 Paris cedex 05, France
We investigate experimentally the behaviour of microscopic ferrofluid droplets under the effect of a rotaing external magnetic field. Depending on the system control parameters, the drops adopt facinating shapes, like cog-wheels, rod-like or pancake shapes, co-rotating wiht the external field, but also creeping snakes, swirling loops and rings. We describe these structures and classify them in a phase diagram.
© SIRPE 2002
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