Linear viscoelastic behavior of aggregated colloidal dispersions


Wolthers, W. and Ende, D. van den and Breedveld, V. and Duits, M.H.G. and Potanin, A.A. and Wientjes, R.H.W. and Mellema, J. (1997) Linear viscoelastic behavior of aggregated colloidal dispersions. Physical Review E: Statistical physics, plasmas, fluids, and related interdisciplinary topics, 56 (5). pp. 5726-5733. ISSN 1063-651X

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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.
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Copyright:© 1997 American Physical Society
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