The role of friction in the yielding of adhesive non-Brownian suspensions

Richards, James A.; Guy, Ben M.; Blanco, Elena; Hermes, Michiel; Poy, Guilhem; Poon, Wilson

doi:10.1122/1.5132395

Cited by 38 publications

(53 citation statements)

References 46 publications

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“…Our findings therefore encourage future simulation studies to include realistic constraints and relationships between sliding and rolling friction coefficients and adhesive forces. Moreover, we present a route where the variations of the contact properties are reversible and externally controlled during shear and do not require a modification of the composition of the materials, i.e., via the addition of surfactants 45 , 55 and small molecules (e.g., urea) 27 .…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2021

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Dense suspensions of colloidal or granular particles can display pronounced non-Newtonian behaviour, such as discontinuous shear thickening and shear jamming. The essential contribution of particle surface roughness and adhesive forces confirms that stress-activated frictional contacts can play a key role in these phenomena. Here, by employing a system of microparticles coated by responsive polymers, we report experimental evidence that the relative contributions of friction, adhesion, and surface roughness can be tuned in situ as a function of temperature. Modifying temperature during shear therefore allows contact conditions to be regulated, and discontinuous shear thickening to be switched on and off on demand. The macroscopic rheological response follows the dictates of independent single-particle characterization of adhesive and tribological properties, obtained by colloidal-probe atomic force microscopy. Our findings identify additional routes for the design of smart non-Newtonian fluids and open a way to more directly connect experiments to computational models of sheared suspensions.

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Section: Discussionmentioning

confidence: 99%

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

et al. 2021

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“…1), as observed. Importantly, adhesive constraints that limit inter-particle rolling can also lower φ J (Guy et al 2018;Richards et al 2020). These are broken above a critical torque, M a , set by the attractive force between particles and a surface length scale that pins the contact (Heim et al 1999).…”

Section: Constraint Rheology Of Suspensionsmentioning

confidence: 99%

“…If both constraints operate, jamming occurs at a lower concentration, 'adhesive loose packing', φ J (a = 1, f = 1) = φ alp < φ acp . This critical volume fraction, which is possibly related to rigidity percolation (Richards et al 2020), is not yet precisely known; one simulation returns φ alp ≈ 0.14 (Liu et al 2017). The various jamming points are summarised in Table 1. In any actual suspension, 0 ≤ f(σ/σ * ), a(σ/σ * ) ≤ 1, and φ J (σ ) depends on the degree to which frictional/adhesive contacts are formed/broken by the applied stress.…”

Section: Constraint Rheology Of Suspensionsmentioning

confidence: 99%

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Turning a yield-stress calcite suspension into a shear-thickening one by tuning inter-particle friction

2020

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We show that a suspension of non-Brownian calcite particles in glycerol-water mixtures can be tuned continuously from being a yield-stress suspension to a shear-thickening suspension—without a measurable yield stress—by the addition of various surfactants. We interpret our results within a recent theoretical framework that models the rheological effects of stress-dependent constraints on inter-particle motion. Bare calcite particle suspensions are found to have finite yield stresses. In these suspensions, frictional contacts that constrain inter-particle sliding form at an infinitesimal applied stress and remain thereafter, while adhesive bonds that constrain inter-particle rotation are broken as the applied stress increases. Adding surfactants reduces the yield stress of such suspensions. We show that, contrary to the case of surfactant added to colloidal suspensions, this effect in non-Brownian suspensions is attributable to the emergence of a finite onset stress for the formation of frictional contacts. Our data suggest that the magnitude of this onset stress is set by the strength of surfactant adsorption to the particle surfaces, which therefore constitutes a new design principle for using surfactants to tune the rheology of formulations consisting of suspensions of adhesive non-Brownian particles.

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“…Recent studies have shown that shear-thinning observed in concentrated NBSs was due either to the presence of adhesion forces between particles [70] or to the decrease in the interparticle friction coefficient when the shear stress increases [15,17] or both [71]. These two effects lead to variations in viscosity with shear stress that have very different patterns.…”

Section: Influence Of Surface Functionalization On the Rheological Properties Of Nbss Of µPs Mp1 Mp3 And Mp5mentioning

confidence: 99%

Cross-linked polymer microparticles with tunable surface properties by the combination of suspension free radical copolymerization and Click chemistry

Moratille

Arshad

Cohen

et al. 2022

Journal of Colloid and Interface Science

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We propose a general, versatile and broad in scope two-steps approach for the elaboration of cross-linked polymer microparticles (µPs) with tunable surface properties and functionalities. Surface-functionalized cross-linked polymer µPs with diameter in the 80 μm range are prepared by the combination of: 1) suspension free radical copolymerization of styrene, propargyl methacrylate and 1,6-hexanediol dimethacrylate, 2) subsequent covalent tethering of a variety of azide-functionalized moieties by copper(I)-catalyzed azide-alkyne cycloaddition (i.e. rhodamine B fluorescent dye or poly(ethylene glycol) brushes) and, 3) optional N-alkylation of the 1,2,3-triazole groups followed by anion exchange reactions to afford covalently-tethered 1,2,3-triazolium ionic liquids with iodide or cresol red as counter-anions. The resulting µPs are characterized by laser diffraction, differential scanning calorimetry, as well as by optical, confocal fluorescence, scanning electron and atomic force microscopies. Finally, the rheological properties of concentrated suspensions (volume fractions of 0.40 and 0.44) of the different synthesized µPs dispersed in a 1:1 (vol/vol) mixture of polalkylene glycol and water are studied.The modification of particles surface properties contributes not only to change the stability of the suspensions against flocculation, but also to significantly modify their rheological behavior at high shear stresses. This last result highlights the importance of non-hydrodynamic contact forces in the rheology of non-Brownian suspensions.

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The role of friction in the yielding of adhesive non-Brownian suspensions

Cited by 38 publications

References 46 publications

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

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

Turning a yield-stress calcite suspension into a shear-thickening one by tuning inter-particle friction

Cross-linked polymer microparticles with tunable surface properties by the combination of suspension free radical copolymerization and Click chemistry

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