Magnetic particle structure ordering in ferrogel under applied field

V. T. Lebedev, Gy Torok, L. Cser, A. L. Buyanov, L. G. Revelskaya, D. N. Orlova, A. I. Sibilev

Research output: Contribution to journalConference article

Abstract

A new cross linked polymer compound (hydrogel) with fine Fe3O4 - grains embedded in it has been investigated by neutron scattering. We studied the nanoscale structures in ferrogels synthesized in a magnetic field and without field. Using the technique of polarized neutron scattering we have studied the self-assembly of particles under applied magnetic field. The hydrogel without any field prepared (degree of swelling approximately 10 g/g) showed a significant spatial particle's correlation to be arisen from their dipole coupling even in a weak field H to approximately 65 Oe. This is observable as a nuclear-magnetic interference at momentum transfer q to approximately 0.1-0.3 nm-1 corresponding to a characteristic particle's diameter Dp to approximately 30 nm. The strong field (H to approximately 4 kOe) induces a slow growth of the interference effect. Over the observation time (several 10th hours) the cluster formation of particles was observed. The rate of aggregation is limited by field induced diffusion of particles trapped in the network. This magnetic ordering is reversible: it disappears when switching off the external field, whereas particles structures being more stable remain quite unchanged approximately 6 h after.

Original languageEnglish
Pages (from-to)II/-
JournalMaterials Science Forum
Volume321
Publication statusPublished - Jan 1 2000
EventProceedings of the 1998 6th European Powder Diffraction Conference (EPDIC 6) - Budapest, Hung
Duration: Aug 22 1998Aug 25 1998

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Lebedev, V. T., Torok, G., Cser, L., Buyanov, A. L., Revelskaya, L. G., Orlova, D. N., & Sibilev, A. I. (2000). Magnetic particle structure ordering in ferrogel under applied field. Materials Science Forum, 321, II/-.