Three-dimensional imaging of colloidal glasses under steady shear

Abstract

Using fast confocal microscopy we image the three-dimensional dynamics of particles in a yielded hard-sphere colloidal glass under steady shear. The structural relaxation, observed in regions with uniform shear, is nearly isotropic but is distinctly different from that of quiescent metastable colloidal fluids. The inverse relaxation time ${\tau }_{\alpha }^{-1}$ and diffusion constant $D$, as functions of the {\it local} shear rate $\dot{\gamma }$, show marked shear thinning with ${\tau }_{\alpha }^{-1}\propto D\propto {\dot{\gamma }}^{0.8}$ over more than two decades in $\dot{\gamma }$. In contrast, the {\it global} rheology of the system displays Herschel-Bulkley behavior. We discuss the possible role of large scale shear localization and other mechanisms in generating this difference.

4 pages, 5 figures, to be published in PRL

References in corpus (2)

• Yielding and flow in adhesive and non-adhesive concentrated emulsions
• Shear zones and wall slip in the capillary flow of concentrated colloidal suspensions

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