Nonequilibrium structure of concentrated colloidal fluids under steady shear: leading-order response

Oliver Henrich, Oskar Pfeifroth, Matthias Fuchs

    Research output: Contribution to journalArticle

    14 Citations (Scopus)

    Abstract

    The flow-induced microstructural distortions of dense colloidal dispersions under steady shearing are derived within a recent first-principles approach to the nonlinear rheology of colloidal fluids and glasses. The stationary structure factor is discussed to leading orders in shear rate . We find that shear affects the stationary structure whenever the dressed Peclet/Weissenberg number becomes appreciable; here τ is the structural or α-relaxation time. Close to vitrification, this predicts significantly larger shear distortions than expected from considering the bare Peclet number Pe0; it compares with the diffusion time of a colloid at infinite dilution.

    LanguageEnglish
    Article number205132
    Number of pages6
    JournalJournal of Physics: Condensed Matter
    Volume19
    Issue number20
    DOIs
    Publication statusPublished - 25 Apr 2007

    Fingerprint

    Peclet number
    shear
    Vitrification
    Fluids
    fluids
    Colloids
    Dispersions
    Rheology
    Shearing
    Relaxation time
    Shear deformation
    Dilution
    vitrification
    shearing
    rheology
    Glass
    dilution
    colloids
    relaxation time
    glass

    Keywords

    • diffusion
    • microstructure
    • Peclet number
    • rheology
    • shear stress
    • structural relaxation

    Cite this

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    abstract = "The flow-induced microstructural distortions of dense colloidal dispersions under steady shearing are derived within a recent first-principles approach to the nonlinear rheology of colloidal fluids and glasses. The stationary structure factor is discussed to leading orders in shear rate . We find that shear affects the stationary structure whenever the dressed Peclet/Weissenberg number becomes appreciable; here τ is the structural or α-relaxation time. Close to vitrification, this predicts significantly larger shear distortions than expected from considering the bare Peclet number Pe0; it compares with the diffusion time of a colloid at infinite dilution.",
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    Nonequilibrium structure of concentrated colloidal fluids under steady shear : leading-order response. / Henrich, Oliver; Pfeifroth, Oskar; Fuchs, Matthias.

    In: Journal of Physics: Condensed Matter, Vol. 19, No. 20, 205132, 25.04.2007.

    Research output: Contribution to journalArticle

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    T1 - Nonequilibrium structure of concentrated colloidal fluids under steady shear

    T2 - Journal of Physics: Condensed Matter

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    AU - Pfeifroth, Oskar

    AU - Fuchs, Matthias

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    AB - The flow-induced microstructural distortions of dense colloidal dispersions under steady shearing are derived within a recent first-principles approach to the nonlinear rheology of colloidal fluids and glasses. The stationary structure factor is discussed to leading orders in shear rate . We find that shear affects the stationary structure whenever the dressed Peclet/Weissenberg number becomes appreciable; here τ is the structural or α-relaxation time. Close to vitrification, this predicts significantly larger shear distortions than expected from considering the bare Peclet number Pe0; it compares with the diffusion time of a colloid at infinite dilution.

    KW - diffusion

    KW - microstructure

    KW - Peclet number

    KW - rheology

    KW - shear stress

    KW - structural relaxation

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