Strand Plasticity Governs Fatigue in Colloidal Gels

Doorn, Jan Maarten van; Verweij, Joanne E.; Sprakel, Joris; Gucht, Jasper van der

doi:10.1103/physrevlett.120.208005

Cited by 38 publications

(33 citation statements)

References 30 publications

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“…Moreover, the observation that the fingering characteristics are set solely by the properties of the fully fluidized state of the sample might shed light on discrepancies pointed out in [32], where the finger width observed in hair gel solutions is independent of their yield stress. More generally, the local fluidization scenario described here is in line with recent rheological work on stress-induced failure in gels [56], suggesting that our critical energy criterion could be relevant for predicting the outcome of delayed failure in colloidal gels [57,58]. However, our results strongly contrast with experiments on jammed assemblies of soft particles such as dense microgels for which the wavelength of the pattern is set by the yield stress of the material [29].…”

supporting

confidence: 87%

Criterion for Fingering Instabilities in Colloidal Gels

Divoux

Shukla²,

Marsit

et al. 2020

Phys. Rev. Lett.

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We sandwich a colloidal gel between two parallel plates and induce a radial flow by lifting the upper plate at a constant velocity. Two distinct scenarios result from such a tensile test: (i) stable flows during which the gel undergoes a tensile deformation without yielding, and (ii) unstable flows characterized by the radial growth of air fingers into the gel. We show that the unstable regime occurs beyond a critical energy input, independent of the gel's macroscopic yield stress. This implies a local fluidization of the gel at the tip of the growing fingers and results in the most unstable wavelength of the patterns exhibiting the characteristic scalings of the classical viscous fingering instability. Our work provides a quantitative criterion for the onset of fingering in colloidal gels based on a local shear-induced yielding in agreement with the delayed failure framework.

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supporting

confidence: 87%

Criterion for Fingering Instabilities in Colloidal Gels

Divoux

Shukla²,

Marsit

et al. 2020

Phys. Rev. Lett.

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“…The observed divergence of fluctuations then translates into a maximum entropic contribution to the stress, which could manifest in the rheology of these larger networks. Our results open up unique avenues for self-assembled colloidal structures with advanced nonlinear mechanics of relevance for the understanding of the rheology of gels [9], the mechanics of living tissues [16] and of designer colloidal architectures [17]. For the optical tweezers, laser light of 1064nm was used at a power of 20±5mW.…”

mentioning

confidence: 99%

Stochastic buckling of self-assembled colloidal structures

Stuij

Doorn

Kodger

et al. 2019

Phys. Rev. Research

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Although buckling is a prime route to achieve functionalization and synthesis of single colloids, buckling of colloidal structures-made up of multiple colloids-remains poorly studied. Here, we investigate the buckling of the simplest form of a colloidal structure, a colloidal chain that is selfassembled through critical Casimir forces. We demonstrate that the mechanical instability of such a chain is strikingly reminiscent of that of classical Euler buckling but with thermal fluctuations and plastic effects playing a significant role. Namely, we find that fluctuations tend to diverge close to the onset of buckling and that plasticity controls the buckling dynamics at large deformations. Our work provides insight into the effect of geometrical, thermal and plastic interactions on the nonlinear mechanics of self-assembled structures, of relevance for the rheology of complex and living matter and the rational design of colloidal architectures.

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“…We have shown that colloidal gels undergo syneresis when eliminating adhesive boundary conditions and forming gels in situ. Interestingly, we observe that the magnitude of syneresis, ∆V /V 0 , is highly dependent on the surface mobility and local deformability of the particle composing the gel; these two properties are nearly universally overlooked in colloidal materials, yet, they likely play key roles in rheologic responses, especially during mechanical breakdown [32]. While syneresis is more readily seen in 'soft' particle gels, especially foods, we have shown that it is still not negligible in gels composed of solid particles, but often not observed experimentally due to adhesive container walls.…”

Section: K0kmentioning

confidence: 90%