Abstract
The steady‐shear rheological properties of four submicron sterically stabilized silica dispersions differing in particle size were measured. The high‐ and low shear limiting viscosities were found to be a function of the volume fraction only and the volume fraction at which the viscosity diverges was found to be φm=0.63±0.02 in the low shear limit and φm=0.71±0.02 in the high shear limit, independent of particle size. The shear‐thinning behavior scales in the Peclet number. At higher volume fractions, the shear‐thinning transition shifts to a lower Peclet number. The time scale on which the shear‐thinning transition takes place is comparable to the time scale of short‐time self‐diffusion, that is Dsshort/a2 and relates to the structural changes in the dispersion which were observed in an earlier rheo‐optical study.
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