Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2005-02-18
Physics
Condensed Matter
Soft Condensed Matter
7 pages, 4 figures
Scientific paper
10.1063/1.1859285
A recently proposed schematic model for the non--linear rheology of dense colloidal dispersions is compared to flow curves measured in suspensions that consist of thermosensitive particles. The volume fraction of this purely repulsive model system can be adjusted by changing temperature. Hence, high volume fractions ($\phi \leq 0.63$) can be achieved in a reproducible manner. The quantitative analysis of the flow curves suggests that the theoretical approach captures the increase of the low shear viscosity with increasing density, the shear thinning for increasing shear rate, and the yielding of a soft glassy solid. Variations of the high shear viscosity can be traced back to hydrodynamic interactions which are not contained in the present approach but can be incorporated into the data analysis by an appropriate rescaling.
Ballauff Matthias
Fuchs Matthias
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