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RESEARCH PRODUCT
Dynamics of paramagnetic nanostructured rods under rotating field
Jérôme FresnaisRégine PerzynskiKaspars ErglisOlivier SandreBruno Frka-petesicJean-françois BerretAndrejs CebersVincent Dupuissubject
Materials scienceNanostructureField (physics)Maghemite02 engineering and technologyengineering.material01 natural sciencesRod010305 fluids & plasmaslaw.inventionNanocompositesParamagnetismNuclear magnetic resonanceOptical microscopelaw0103 physical sciencesColloids[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]8116DnCondensed matter physicsRelaxation (NMR)Self-assembly[CHIM.MATE]Chemical Sciences/Material chemistry021001 nanoscience & nanotechnologyCondensed Matter PhysicsBlock copolymersElectronic Optical and Magnetic Materials8107-b8380Uv[CHIM.POLY]Chemical Sciences/PolymersengineeringSelf-assembly0210 nano-technology8270Dd[PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]description
International audience; The dynamical rotational behavior of magnetic nanostructured rods based on the auto-association of maghemite nanoparticles and block-copolymers is probed by optical microscopy under rotating fields i n a s imple l iquid. The reorientation of the rods by a field rotated by 90° is first studied. The measured relaxation is characteristic of param-agnetic objects. Under a stationnary rotating field, a synchronous rotational regime is observed at low field frequency. Above a frequency threshold which scales as H^2 , the dynamics becomes asynchronous with back-and-forth rotations. These behaviors are well predicted by the presented model.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-07-14 |