Interparticle hydrogen bonding can elicit shear jamming in dense suspensions

James, Nicole M.; Han, Endao; Cruz, Ricardo Arturo Lopez de la; Jureller, Justin E.; Jaeger, Heinrich M.

doi:10.1038/s41563-018-0175-5

Cited by 106 publications

(98 citation statements)

References 33 publications

(63 reference statements)

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“…Figure These results allow us to pinpoint urea sorption as the driving factor in the reduction of interparticle friction and adhesion, and in turn the shifted SJ regime reported in prior work. 13 We emphasize the reversible nature of this adhesion generated by particle-particle hydrogen bonds, since aggregation and shear thinning would overwhelm the rheological response and result in a yielding-to-jamming transition, as recently predicted by numerical simulations. 25 In conclusion, we have presented direct evidence that chemical processes at the particle surfaces and their kinetics influence the interparticle friction and adhesion that drive the macroscopic flow behavior in dense suspensions, specifically shear jamming.…”

supporting

confidence: 61%

Tuning Interparticle Hydrogen Bonding in Shear-Jamming Suspensions: Kinetic Effects and Consequences for Tribology and Rheology

James

Hsu

Spencer

et al. 2019

J. Phys. Chem. Lett.

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The shear-jamming of dense suspensions can be strongly affected by molecular-scale interactions between particles, e.g. by chemically controlling their propensity for hydrogen bonding. However, hydrogen bonding not only enhances interparticle friction, a critical parameter for shear jamming, but also introduces (reversible) adhesion, whose interplay with friction in shear-jamming systems has so far remained unclear. Here, we present atomic force microscopy studies to assess interparticle adhesion, its relationship to friction, and how these attributes are influenced by urea, a molecule that interferes with hydrogen bonding. We characterize the kinetics of this process with nuclear magnetic resonance, relating it to the time dependence of the macroscopic flow behavior with rheological measurements. We find that time-dependent urea sorption reduces friction and adhesion, causing a shift in the shear-jamming onset. These results extend our mechanistic understanding of chemical effects on the nature of shear jamming, promising new avenues for fundamental studies and applications alike. Graphical TOC Entry

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confidence: 61%

Tuning Interparticle Hydrogen Bonding in Shear-Jamming Suspensions: Kinetic Effects and Consequences for Tribology and Rheology

James

Hsu

Spencer

et al. 2019

J. Phys. Chem. Lett.

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“…t r becomes important in modelling the flow properties whenever the suspension comes close to jamming and the shear rate drops. With our protocol for extracting this relaxation time, future work should be able to clarify the underlying physical mechanism, which may include particle softness [40], surface chemistry [41] or long-range repulsion [42].…”

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confidence: 99%

Competing Timescales Lead to Oscillations in Shear-Thickening Suspensions

et al. 2019

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Competing time scales generate novelty. Here, we show that a coupling between the time scales imposed by instrument inertia and the formation of inter-particle frictional contacts in shear-thickening suspensions leads to highly asymmetric shear-rate oscillations. Experiments tuning the presence of oscillations by varying the two time-scales support our model. The observed oscillations give access to a shear-jamming portion of the flow curve that is forbidden in conventional rheometry. Moreover, the oscillation frequency allows us to quantify an intrinsic relaxation time for particle contacts. The coupling of fast contact network dynamics to a slower system variable should be generic to many other areas of dense suspension flow, with instrument inertia providing a paradigmatic example.

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“…Here, we propose that hydrated and cellular-scale granular materials can enable multiscale tissuelike behaviors in synthetic materials. Due to strong intergranular interactions, dense suspensions of granular materials dynamically respond to external stress through rapid phase transformations (47)(48)(49). When integrated with synthetic hydrogel networks ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Dynamic and Programmable Cellular-Scale Granules Enable Tissue-like Materials

Fang

Han

Zhang

et al. 2020

Matter

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Tissue-like materials are required in many robotic systems to improve human-machine interactions.However, the mechanical properties of living tissues are difficult to replicate. Synthetic materials are not usually capable of simultaneously displaying the behaviors of the cellular ensemble and the extracellular matrix. A particular challenge is identification of a cell-like synthetic component which is tightly integrated with its matrix and also responsive to external stimuli at the population level. Here, we demonstrate that cellular-scale hydrated starch granules, an underexplored component in materials science, can turn conventional hydrogels into tissue-like materials when composites are formed. Using several synchrotron-based X-ray techniques, we reveal the mechanically-induced motion and training dynamics of the starch granules in the hydrogel matrix.These dynamic behaviors enable multiple tissue-like properties such as strain-stiffening, anisotropy, mechanical heterogeneity, programmability, mechanochemistry, impact absorption, and self-healability. The starch-hydrogel composites can be processed as robotic skins that maintain these tissue-like characteristics. One-sentence SummaryMechanically programmable granular materials in hydrogels enable tissue-like materials for robotic skins. ACKNOWLEDGMENTS Funding:We thank Karen Watters for scientific editing of the manuscript.

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Interparticle hydrogen bonding can elicit shear jamming in dense suspensions

Cited by 106 publications

References 33 publications

Tuning Interparticle Hydrogen Bonding in Shear-Jamming Suspensions: Kinetic Effects and Consequences for Tribology and Rheology

Tuning Interparticle Hydrogen Bonding in Shear-Jamming Suspensions: Kinetic Effects and Consequences for Tribology and Rheology

Competing Timescales Lead to Oscillations in Shear-Thickening Suspensions

Dynamic and Programmable Cellular-Scale Granules Enable Tissue-like Materials

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