Difference between revisions of "Stress Enhancement in the Delayed Yielding of Colloidal Gels"

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(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).)
 
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"Stress Enhancement in the Delayed Yielding of Colloidal Gels"
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== Introduction ==
J. Sprakel, S. B. Lindström, T. E. Kodger, and D. A. Weitz. Phys. Rev. Lett. 106, 248303 (2011).
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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.