Dynamics of paramagnetic nanostructured rods under rotating field

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.

Mots clés

8116Dn 8380Uv 8107-b 8270Dd Nanocomposites Self-assembly Colloids Block copolymers

Domaines

Polymères Matériaux Matière Molle [cond-mat.soft]

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RotMicroRods Frka-Petesic et al JMMM2011 author ms.pdf (1.24 Mo)

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https://hal.science/hal-02678291

Soumis le : dimanche 31 mai 2020-20:17:16

Dernière modification le : vendredi 24 mai 2024-15:24:15

Dates et versions

hal-02678291 , version 1 (31-05-2020)

Identifiants

HAL Id : hal-02678291 , version 1
DOI : 10.1016/j.jmmm.2010.11.036

Citer

Bruno Frka-Petesic, Kaspars Erglis, Jean-Francois Berret, Andrejs Cebers, Vincent Dupuis, et al.. Dynamics of paramagnetic nanostructured rods under rotating field. Journal of Magnetism and Magnetic Materials, 2011, 323 (10), pp.1309-1313. ⟨10.1016/j.jmmm.2010.11.036⟩. ⟨hal-02678291⟩

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