6533b871fe1ef96bd12d24e8
RESEARCH PRODUCT
From equilibrium to steady state: The transient dynamics of colloidal liquids under shear
Thomas VoigtmannThomas VoigtmannMatthias FuchsJoseph M. BraderStefan U. EgelhaafJürgen HorbachJürgen HorbachMarco LauratiJochen Zauschsubject
Materials scienceGaussianFOS: Physical sciencesCondensed Matter - Soft Condensed Matterconfocal microscopyMolecular dynamicssymbols.namesakeColloidddc:530General Materials ScienceColloids Glasses Shear Dynamics TransientMagnetosphere particle motionglass forming liquids under shearmode coupling serieDisordered Systems and Neural Networks (cond-mat.dis-nn)MechanicsCondensed Matter - Disordered Systems and Neural NetworksCondensed Matter PhysicsStart upmolecular dynamicsCondensed Matter::Soft Condensed MatterShear (geology)HomogeneousMode couplingsymbolsSoft Condensed Matter (cond-mat.soft)description
We investigate stresses and particle motion during the start up of flow in a colloidal dispersion close to arrest into a glassy state. A combination of molecular dynamics simulation, mode coupling theory and confocal microscopy experiment is used to investigate the origins of the widely observed stress overshoot and (previously not reported) super-diffusive motion in the transient dynamics. A link between the macro-rheological stress versus strain curves and the microscopic particle motion is established. Negative correlations in the transient auto-correlation function of the potential stresses are found responsible for both phenomena, and arise even for homogeneous flows and almost Gaussian particle displacements.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-07-24 |