Tunable shear thickening in suspensions

  title={Tunable shear thickening in suspensions},
  author={Neil Y.C. Lin and Christopher Ness and Michael E. Cates and Jin Sun and Itai Cohen},
  journal={Proceedings of the National Academy of Sciences},
  pages={10774 - 10778}
Significance When a concentrated suspension is strained, its viscosity can increase radically. This behavior, known as shear thickening, can be very useful to technological applications or highly problematic in industrial processes. Suspension flow properties are typically specified at the formulation stage, meaning that they are fixed in advance rather than controlled in situ during application. Here, we report a biaxial shear strategy eradicating the flow-induced structures responsible for… 

Figures from this paper

Shear thickening in concentrated suspensions of smooth spheres in Newtonian suspending fluids.

An overview of the understanding of shear thickening and the methods that have been developed to describe it is provided, as well as outstanding questions.

Revealing the frictional transition in shear-thickening suspensions

These results provide direct evidence that the recent frictional transition scenario applies in real suspensions, and show that tuning the range of the repulsive force below the particle roughness suppresses the frictionless state and also the shear-thickening behavior of the suspension.

Shaken and stirred: Random organization reduces viscosity and dissipation in granular suspensions

Numerical simulations are presented that demonstrate a complementary approach whereby the viscosity divergence is shifted by driven flow tuning, using superimposed shear oscillations in various configurations to facilitate a primary flow.

Exploring the roles of roughness, friction and adhesion in discontinuous shear thickening by means of thermo-responsive particles

Experimental evidence is reported that the relative contributions of friction, adhesion, and surface roughness can be tuned in situ as a function of temperature, allowing contact conditions to be regulated, and discontinuous shear thickening to be switched on and off on demand.

Global topology of contact force networks: Insight into shear thickening suspensions.

The topological metrics show that the network grows homogeneously at large scales but with many local regions devoid of contacts, indicating clearly the role of CFN growth in causing the large change in the rheological response at the shear thickening transition.

Using Acoustic Perturbations to Dynamically Tune Shear Thickening in Colloidal Suspensions.

Piezoelectric transducers are used to apply acoustic perturbations to dynamically tune the suspension viscosity in the shear-thickening regime to attribute the mechanism of dethickening to the disruption of shear -induced force chains via perturbation that are large relative to the particle roughness scale.

Tuning the mechanical and flow properties of colloidal gels with ultrasound

Colloidal gels, where nanoscale particles aggregate into an elastic yet fragile network, are at the heart of materials that combine specific optical, electrical and mechanical properties. Tailoring

Flow-to-fracture transition and pattern formation in a discontinuous shear thickening fluid

Recent theoretical and experimental work suggests a frictionless-frictional transition with increasing inter-particle pressure explains the extreme solid-like response of discontinuous shear

Density waves in shear-thickening suspensions

This work reveals how shear-thickening suspensions flow, shedding light onto as yet non-understood complex dynamics reported in the literature, and shows the existence of density fluctuations that appear as periodic waves moving in the direction of flow and breaking azimuthal symmetry.

A hydrodynamic model for discontinuous shear-thickening in dense suspensions

Restricted sliding or rotational motion of colloidal particles plays a key role in the emergence of discontinuous shear thickening (DST). From viscometric functions to the number of contacting



Generality of shear thickening in dense suspensions.

It is demonstrated that shear thickening can be masked by a yield stress and can be recovered when the yield stress is decreased below a threshold, which opens up possibilities for the design of smart suspensions that combine shear Thickening with electro- or magnetorheological response.

The role of dilation and confining stresses in shear thickening of dense suspensions

Many densely packed suspensions and colloids exhibit a behavior known as Discontinuous Shear Thickening in which the shear stress jumps dramatically and reversibly as the shear rate is increased. We

Shear thickening, frictionless and frictional rheologies in non-Brownian suspensions

Particles suspended in a Newtonian fluid raise the viscosity and also generally give rise to a shear-rate dependent rheology. In particular, pronounced shear thickening may be observed at large solid

Shear‐Induced Structure in a Concentrated Suspension of Solid Spheres

Two novel phenomena were observed in steady and transient shear measurements which were made in a Couette device of a R‐17 Weissenberg Rheogoniometer with suspensions of polystyrene spheres, 40–50 μm

Origins of the anomalous stress behavior in charged colloidal suspensions under shear.

  • Amit KumarJ. Higdon
  • Materials Science
    Physical review. E, Statistical, nonlinear, and soft matter physics
  • 2010
Dynamic simulations show coexistence of ordered and disordered stable states with the state dependent on the initial condition, which explains the anomalous behavior and hysteresis loops in stress data reported in the literature.

Hydrodynamic and Contact Contributions to Continuous Shear Thickening in Colloidal Suspensions.

It is found that contact forces dominate even continuous shear thickening, and computer simulations show that these forces most likely arise from frictional interactions.

Flow regime transitions in dense non-Brownian suspensions: rheology, microstructural characterization, and constitutive modeling.

  • C. NessJin Sun
  • Engineering
    Physical review. E, Statistical, nonlinear, and soft matter physics
  • 2015
A constitutive model is proposed combining a viscous pressure term with a dry granular model and shown to successfully capture the flow regime transitions, which are associated with the evolving contribution of lubrication to the suspension stress.

Convective Cage Release in Model Colloidal Glasses.

The crossover frequency deduced from the viscoelastic spectra is used as a direct measure of the inverse microstructural relaxation time, during flow, and the microscopic mechanism of flow can be identified as a convective cage release.

Granulation and bistability in non-Brownian suspensions

This paper focuses on explanations of granular bistability based on steady-state shear-thickening, but also discusses alternative explanations based on flow history effects.

Shear thickening of cornstarch suspensions as a reentrant jamming transition.

Shear thickening can be interpreted as the consequence of dilatancy: the system under flow wants to dilate but instead undergoes a jamming transition because it is confined, as confirmed by measurement of the dilation of the suspension as a function of the shear rate.