Dynamics of PVA-gel with magnetic macrojunctions

G. Török, V. T. Lebedev, L. Cser, Gy Káli, M. Zrínyi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The neutron-spin-echo spectrometer SPAN [C. Pappas et al., Physica B 276-278 (2000) 162] has been used for the study of the dynamics of ferrogel of Poly(vinylalcohol) with subdomain particles of magnetite (size ∼ 10nm, concentration in gel C = 4.25wt%.) embedded in polymer matrix. By separation of coherent nuclear scattering on particles from incoherent one, contributed by network and solvent, we distinguished the dynamical behaviours of subsystems in ferrogel. The self-correlation of magnetic particle, attached to network, via its conformational changes obeys the law: Sp(q,t) ∼ exp{- q2a2[1 - cos(2π(t/τ)β)]/2} where the a ∼ 1 nm is the amplitude of particle's oscillation, and the exponent β ∼ 1/2 characterises the rotational diffusion of chain units with relaxation time τ ∼ 0.3 ns. In the surrounding solvent, half of the molecules showed free diffusion whereas the remaining part, situated in the neighbourhood of polymer chains, is involved in the stretched relaxation.

Original languageEnglish
Pages (from-to)40-44
Number of pages5
JournalPhysica B: Condensed Matter
Volume297
Issue number1-4
DOIs
Publication statusPublished - Mar 2001

Fingerprint

Gels
gels
Ferrosoferric Oxide
Magnetite
Polymer matrix
Relaxation time
Particles (particulate matter)
Spectrometers
Polymers
Neutrons
Scattering
nuclear scattering
Molecules
coherent scattering
polymers
magnetite
echoes
relaxation time
exponents
spectrometers

Keywords

  • Ferrogel
  • Incoherent scattering
  • Neutron spin echo

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Dynamics of PVA-gel with magnetic macrojunctions. / Török, G.; Lebedev, V. T.; Cser, L.; Káli, Gy; Zrínyi, M.

In: Physica B: Condensed Matter, Vol. 297, No. 1-4, 03.2001, p. 40-44.

Research output: Contribution to journalArticle

Török, G. ; Lebedev, V. T. ; Cser, L. ; Káli, Gy ; Zrínyi, M. / Dynamics of PVA-gel with magnetic macrojunctions. In: Physica B: Condensed Matter. 2001 ; Vol. 297, No. 1-4. pp. 40-44.
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