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

doi:10.1103/PhysRevE.56.5726

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 language	English
Pages (from-to)	5726-5733
Number of pages	8
Journal	Physical review E: Statistical physics, plasmas, fluids, and related interdisciplinary topics
Volume	1997
Issue number	56
DOIs	https://doi.org/10.1103/PhysRevE.56.5726
Publication status	Published - 1997

Keywords

METIS-129204
IR-73487

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10.1103/PhysRevE.56.5726

Wolthers97linearFinal published version, 154 KB

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title = "Linear viscoelastic behavior of aggregated colloidal dispersions",

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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year = "1997",

doi = "10.1103/PhysRevE.56.5726",

language = "English",

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Linear viscoelastic behavior of aggregated colloidal dispersions. / Wolthers, W.; van den Ende, D.; Breedveld, Victor; Duits, M.H.G.; Potanin, A.; Potanin, A.A.; Wientjes, R.H.W.; Mellema, J.

In: Physical review E: Statistical physics, plasmas, fluids, and related interdisciplinary topics, Vol. 1997, No. 56, 1997, p. 5726-5733.

Research output: Contribution to journal › Article › Academic › peer-review

TY - JOUR

T1 - Linear viscoelastic behavior of aggregated colloidal dispersions

AU - Wolthers, W.

AU - van den Ende, D.

AU - Breedveld, Victor

AU - Duits, M.H.G.

AU - Potanin, A.

AU - Potanin, A.A.

AU - Wientjes, R.H.W.

AU - Mellema, J.

PY - 1997

Y1 - 1997

N2 - 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.

AB - 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.

KW - METIS-129204

KW - IR-73487

U2 - 10.1103/PhysRevE.56.5726

DO - 10.1103/PhysRevE.56.5726

M3 - Article

VL - 1997

SP - 5726

EP - 5733

JO - Physical review E: covering statistical, nonlinear, biological, and soft matter physics

JF - Physical review E: covering statistical, nonlinear, biological, and soft matter physics

SN - 2470-0045

IS - 56

ER -

Linear viscoelastic behavior of aggregated colloidal dispersions

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