Difference between revisions of "Stress Enhancement in the Delayed Yielding of Colloidal Gels"
From Soft-Matter
(New page: "Stress Enhancement in the Delayed Yielding of Colloidal Gels" J. Sprakel, S. B. Lindström, T. E. Kodger, and D. A. Weitz. Phys. Rev. Lett. 106, 248303 (2011).) |
|||
| Line 1: | Line 1: | ||
| − | + | == Introduction == | |
| − | + | Networks of aggregated colloidal particles are solidlike and can sustain an applied shear stress while | |
| + | exhibiting little or no creep; however, ultimately they will catastrophically fail. We show that the time | ||
| + | delay for this yielding decreases in two distinct exponential regimes with applied stress. This behavior is | ||
| + | universal and found for a variety of colloidal gel systems. We present a bond-rupture model that | ||
| + | quantitatively describes this behavior and highlights the role of mesoscopic structures. Our result gives | ||
| + | new insight into the nature of yielding in these soft solid materials. | ||
Revision as of 17:34, 11 September 2011
Introduction
Networks of aggregated colloidal particles are solidlike and can sustain an applied shear stress while exhibiting little or no creep; however, ultimately they will catastrophically fail. We show that the time delay for this yielding decreases in two distinct exponential regimes with applied stress. This behavior is universal and found for a variety of colloidal gel systems. We present a bond-rupture model that quantitatively describes this behavior and highlights the role of mesoscopic structures. Our result gives new insight into the nature of yielding in these soft solid materials.
