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Magnetic field induced instabilities of a doped lyotropic hexagonal phase |
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| Authors: | L Ramos P Fabre L Fruchter |
| Institution: | (1) Laboratoire de Physique de la Matière Condensée (CNRS, URA 792), Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France, FR;(2) UMR CNRS-Elf Atochem, 95 rue Danton, 92303 Levallois-Perret Cedex, France, FR;(3) Laboratoire de Physique des Solides, Batiment 510, Université Paris-Sud Orsay, 91405 Orsay Cedex, France, FR |
| Abstract: | A new anisotropic magnetic fluid is obtained using a colloidal suspension of magnetic particles of nanometric size (ferrofluid) as a component of a swollen lyotropic hexagonal phase. This doped hexagonal system exhibits specific behaviors when submitted to a magnetic field of weak intensity. The field-induced instabilities are described and interpreted; they result from a high anisotropy of the magnetic susceptibility of the medium, which is measured. It is finally shown that the magnetic properties of the doped hexagonal phase allows one a determination of the compression modulus of the system. Received 10 February 1998 |
| Keywords: | PACS 75 50 Mm Magnetic liquids - 82 70 Dd Colloids - 61 30 Gd Orientational order of liquid crystals electric and magnetic field effects on order |
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