Stress enhancement in the delayed yielding of colloidal gels

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.

Lindström, Stefan BHarvard University, Cambridge, USA,SEAS(Swepub:miun)stelin2200 (author)
Kodger, T. E.Harvard University, Cambridge, USA,SEAS (author)
Weitz, D. A.Harvard University,SEAS (author)
Harvard University, Cambridge,USASEAS (creator_code:org_t)

By the author/editor: Sprakel, Joris; Lindström, Stefa ...; Kodger, T. E.; Weitz, D. A.

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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