Volume 41, Number 5, March I 1998
|Page(s)||507 - 512|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
Lyotropic ferronematics: Magnetic orientational transition in the discotic phase
Laboratoire de Physicochimie Inorganique, Université
Pierre et Marie Curie, bat. F, case 63, 4 place Jussieu, 75252 Paris Cedex 05,
2 Laboratory of Kinetics of Anisotropic Fluids, Institute of Continuous Media Mechanics, Urals Branch of the Russian Academy of Sciences, Perm, 614013, Russia
3 Laboratoire des Milieux Désordonnées et Hétérogènes, Université Pierre et Marie Curie, Tour 13, case 78, 4 place Jussieu, 75252 Paris Cedex 05, France
Accepted: 16 January 1998
We report the synthesis of lyotropic ferronematics with a content of magnetic nanoparticles () up to 1 vol.%. In the ferrodiscotic phase we observe a magnetic Frederiks transition with critical fields about two orders of magnitude lower than that for an undoped lyotropic system. A model accounting for the magnetic polarization behavior of the studied ferronematics is presented.
PACS: 61.30.Eb – Experimental determinations of smectic, nematic, cholesteric, and other structures / 75.50.Mm – Magnetic liquids / 61.30.Gd – Orientational order of liquid crystals; electric and magnetic field effects on order
© EDP Sciences, 1998
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