Hyperfine Interactions

, Volume 56, Issue 1–4, pp 1471–1476 | Cite as

Temperature dependence of the dynamics of ultrafine particles in a polymeric network

  • G. U. Nienhaus
  • A. S. Plachinda
  • M. Fischer
  • V. I. Khromov
  • F. Parak
  • I. P. Suzdalev
  • V. I. Goldanskii
Relaxation Effects Diffusion

Abstract

Simple model systems with pronounced dynamical features will help to get a deeper insight into the complicated dynamics of large molecular networks. We investigated the bounded diffusion of ultrafine Fe(OH)3 particles (∼30 Å in diameter) in the three-dimensional network of the cation exchanger Dowex 50 W which was solvated with a water solution of sucrose (60 wt%). Mössbauer spectra were recorded in the temperature range from 80 K to 305 K. At temperatures above 250 K broad diffusional lines of different widths appear in the spectrum proving the bounded nature of the diffusion. The line widths strongly increase with temperature to values of several hundred mm/s. Around 300 K a large portion of the area escapes even from the largest window of observation used in our experiments (±550 mm/s).

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Copyright information

© J.C. Baltzer A.G. Scientific Publishing Company 1990

Authors and Affiliations

  • G. U. Nienhaus
    • 1
  • A. S. Plachinda
    • 2
  • M. Fischer
    • 1
  • V. I. Khromov
    • 2
  • F. Parak
    • 1
  • I. P. Suzdalev
    • 2
  • V. I. Goldanskii
    • 2
  1. 1.Institut für Molekulare Biophysik der UniversitätMainzF.R.G.
  2. 2.Institute of Chemical Physics of the USSR Academy of SciencesMoscowUSSR

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