Slip and flow of hard-sphere colloidal glasses
arXiv:0807.1437 · doi:10.1103/PhysRevLett.101.258301
Abstract
We study the flow of concentrated hard-sphere colloidal suspensions along smooth, non-stick walls using cone-plate rheometry and simultaneous confocal microscopy. In the glass regime, the global flow shows a transition from Herschel-Bulkley behavior at large shear rate to a characteristic Bingham slip response at small rates, absent for ergodic colloidal fluids. Imaging reveals both the `solid' microstructure during full slip and the local nature of the `slip to shear' transition. Both the local and global flow are described by a phenomenological model, and the associated Bingham slip parameters exhibit characteristic scaling with size and concentration of the hard spheres.
4 pages, 4 figures. Accepted for publication in PRL
References in corpus (5)
- Three-dimensional imaging of colloidal glasses under steady shear
- Yielding and flow in adhesive and non-adhesive concentrated emulsions
- Spatio-temporal dynamics of wormlike micelles under shear
- Shear zones and wall slip in the capillary flow of concentrated colloidal suspensions
- Rate Dependence and Role of Disorder in Linearly Sheared Two-Dimensional Foams