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

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new insight into the nature of yielding in these soft solid materials.
 
new insight into the nature of yielding in these soft solid materials.
  
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[[Image:/Users/Bryan/Desktop/Harvard/AP 255 Condensed Soft Matter/Wiki Papers/Images/Fig1_Stress_Enhancement.jpg|600px|right|thumb|]]

Revision as of 17:48, 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.