Linear viscoelastic behavior of aggregated colloidal dispersions

W. Wolthers, D. van den Ende, Victor Breedveld, M.H.G. Duits, A. Potanin, A.A. Potanin, R.H.W. Wientjes, J. Mellema

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Abstract

The viscoelastic behavior of a depletion-flocculated dispersion of colloidal spheres is investigated at different volume fractions of the spheres, using a controlled stress and a dynamic rheometer. Combining the results, we obtain the storage G′ and loss G′′ moduli over a frequency range of 0.02<ω<200rad/s. The measured G′ gradually increases with increasing frequency, while G′′ almost remains constant, indicating a broad spectrum of relaxation times. To describe and explain the observed behavior of the moduli as a function of frequency and volume fraction in terms of microscopic parameters, a microrheological model based on the fractal concept is proposed. Comparing experimental results with model calculations, we find a good agreement between the two, with physically plausible parameter values.
Original languageEnglish
Pages (from-to)5726-5733
Number of pages8
JournalPhysical review E: Statistical physics, plasmas, fluids, and related interdisciplinary topics
Volume1997
Issue number56
DOIs
Publication statusPublished - 1997

Keywords

  • METIS-129204
  • IR-73487

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