Stress enhancement in the delayed yielding of colloidal gels

J.H.B. Sprakel, S.B. Lindstrom, T.E. Kodger, D.A. Weitz

Research output: Contribution to journalArticleAcademicpeer-review

122 Citations (Scopus)

Abstract

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.
Original languageEnglish
Article number248303
JournalPhysical Review Letters
Volume106
Issue number24
DOIs
Publication statusPublished - 2011

Keywords

  • fracture
  • rheology

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