Journal
PHYSICAL REVIEW E
Volume 85, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.85.041403
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Funding
- National Science Foundation
- Directorate For Engineering [955241] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys [955241] Funding Source: National Science Foundation
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We investigate the nonlinear rheology of dilute, depletion-induced colloidal gels and report that these systems yield via a two-step process. We propose the two yield points to be associated with interparticle bond rotation and bond breakage, respectively. These distinct yielding mechanisms lead to remarkable creep profiles at intermediate values of the applied stress, highlighted by an anisotropic shear-induced strengthening and flow arrest at very large accumulated strains (gamma similar to 80). The possible microstructural origins of this behavior are discussed.
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