2018
DOI: 10.1073/pnas.1801066115
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Roughness-dependent tribology effects on discontinuous shear thickening

Abstract: SignificanceShear thickening is a ubiquitous rheological phenomenon whereby dense suspensions of particles in a fluid exhibit a viscosity increase at high shear, which can turn into a viscosity divergence [discontinuous shear thickening (DST)]. Although macroscopically well characterized, the microscopic origin of DST is still debated, especially in connection to particle surface properties, e.g., roughness and friction. We elucidate here the mechanisms underpinning DST by carrying out nanotribological measure… Show more

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Cited by 145 publications
(127 citation statements)
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“…For simplicity here we consider jamming (unjamming) to be a rapid increase (decrease) in rigidity that is typically associated with an increase (decrease) in volume fraction φ toward (away from) a critical value φ c . The nature of this transition, however, is sensitive to particle contacts and interactions [123][124][125] and interparticle friction [126,127], factors that are important for geophysicallyrelevant properties such as dilatancy [128].…”
Section: Soft Matter Concepts In Earth Materialsmentioning
confidence: 99%
See 1 more Smart Citation
“…For simplicity here we consider jamming (unjamming) to be a rapid increase (decrease) in rigidity that is typically associated with an increase (decrease) in volume fraction φ toward (away from) a critical value φ c . The nature of this transition, however, is sensitive to particle contacts and interactions [123][124][125] and interparticle friction [126,127], factors that are important for geophysicallyrelevant properties such as dilatancy [128].…”
Section: Soft Matter Concepts In Earth Materialsmentioning
confidence: 99%
“…The unifying framework of µ(I) rheology is appealing in its simplicity, and recent work has demonstrated how it may be generalized to account for: Non-Newtonian carrier fluids [226]; thermal effects [227]; and cohesion [228,229]. On the other hand, qualitative changes in flow behavior may be induced by: particle polydispersity and shape [230,231], surface roughness [124], repulsion [130] and hydrogen bonding [125], at-traction [74], and capillary forces [232]. All of these factors ultimately influence particle microstructure, and explicit accounting for these changes in bulk continnum models is a challenge.…”
Section: Outstanding Problemsmentioning
confidence: 99%
“…The consensus from these studies, a substantial fraction of which are on suspension of spherical or compact particles, suggests that while the hydrocluster mechanism [7,8] can account for a nominal increase in η, a larger increase stems from particles forming a stressinduced frictional contact network [9][10][11][12][13][14][15][16][17][18]. This has resulted in a multitude of strategies where shear-thickening is passively controlled by altering particle tribological properties [19] or actively tuned through complex mechanical perturbations that disrupt the formation of force chains [20]. Even though altering the particle shape is a powerful means to control rheological response [21,23], very little is known about the mechanism of shear-thickening in suspensions of anisotropic particles.…”
mentioning
confidence: 99%
“…Left: Relative viscosity as a function of the shear rate for frictionless dimers with aspect ratio α = 2, for several volume fractions φ = 0.4, 0.45, 0.5 and 0.54. Right: Angles θ and ϕ characterizing the director (see text for definitions) as a function of the applied stress τ/σ r , for the corresponding simulations at φ = 0.5 in the left panel Hsu et al, 2018]…”
mentioning
confidence: 99%