2008/07/24 by J. Zausch, J Zausch, J. Horbach +10 · 1 citation
Environmental Science · Materials Science · Physics and Astronomy · #Coagulation and Flocculation Studies #Material Dynamics and Properties #Pickering emulsions and particle stabilization #cond-mat.dis-nn #cond-mat.soft
paper · pdf · doi:10.1088/0953-8984/20/40/404210
24 pages, 14 figures, J. Phys.: Condens. Matter, in press
arxiv created 2008/07/24 · openalex publication_date 2008/09/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 experiments 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.