Rheological Aging and Rejuvenation in Microgel Pastes

Cloître, Michel; Borrega, Régis; Leibler, Ludwik

doi:10.1103/physrevlett.85.4819

Cited by 311 publications

(359 citation statements)

References 17 publications

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“…Perhaps the most important result of this work is the observation that the amplitude of the stress uniquely determines the long-time memory and slow evolution of the colloidal paste. Microrheological measurements of the time-dependent creep compliance of an aging cytoskeleton [26], which essentially comprises a crowded network of semi-flexible biopolymers, can be scaled onto a master curve very similar to the kind observed for microgel pastes [6]. The aging behaviour, intermittency and slow dynamics observed in this living system strongly resemble the dynamics observed in inert soft glasses.…”

Section: Slow Dynamics and Aging In Some Jammed Systemsmentioning

confidence: 99%

“…Due to the broad distribution in the depths of the energy barriers in the potential energy landscape characterising these systems, the mechanical properties of SGMs evolve or 'age' continuously. Soft colloidal pastes formed from jammed microgel particles show many history-dependent properties that are interpreted in terms of aging phenomena [6,42]. Their strain recovery depends on the wait time (age) t a after flow cessation and can be scaled onto a master curve for all applied stresses below the yield stress σ y .…”

Section: Slow Dynamics and Aging In Some Jammed Systemsmentioning

confidence: 99%

“…Aqueous foams, for example, age due to coarsening and bubble rearrangement processes [4]. Polymer glasses [5], microgel solutions [6] and aqueous clay suspensions [7,8] are some more examples of aging systems. In spite of their apparent diversity, these materials are all structurally disordered and out-of-equilibrium.…”

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confidence: 99%

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Slow dynamics, aging, and glassy rheology in soft and living matter

Bandyopadhyay

Liang

Harden

et al. 2006

Solid State Communications

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We explore the origins of slow dynamics, aging and glassy rheology in soft and living matter. Non-diffusive slow dynamics and aging in materials characterised by crowding of the constituents can be explained in terms of structural rearrangement or remodelling events that occur within the jammed state. In this context, we introduce the jamming phase diagram proposed by Liu and Nagel to understand the ergodic-nonergodic transition in these systems, and discuss recent theoretical attempts to explain the unusual, faster-than-exponential dynamical structure factors observed in jammed soft materials. We next focus on the anomalous rheology (flow and deformation behaviour) ubiquitous in soft matter characterised by metastability and structural disorder, and refer to the Soft Glassy Rheology (SGR) model that quantifies the mechanical response of these systems and predicts aging under suitable conditions. As part of a survey of experimental work related to these issues, we present x-ray photon correlation spectroscopy (XPCS) results of the aging of laponite clay suspensions following rejuvenation. We conclude by exploring the scientific literature for recent theoretical advances in the understanding of these models and for experimental investigations aimed at testing their predictions.

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Section: Slow Dynamics and Aging In Some Jammed Systemsmentioning

confidence: 99%

Section: Slow Dynamics and Aging In Some Jammed Systemsmentioning

confidence: 99%

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Slow dynamics, aging, and glassy rheology in soft and living matter

Bandyopadhyay

Liang

Harden

et al. 2006

Solid State Communications

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“…Aging is a process observed in many different glassy systems, including colloidal glasses [6], microgel pastes [7], and spin glasses [8], but is most frequently studied in polymers due to their good glass-forming ability and ubiquitous use in structural applications. Of particular interest is therefore to understand the effect of aging on their mechanical response during plastic deformation [5].…”

Section: Introductionmentioning

confidence: 99%

Simulations of aging and plastic deformation in polymer glasses

Warren

Rottler

2007

Phys. Rev. E

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We study the effect of physical aging on the mechanical properties of a model polymer glass using molecular dynamics simulations. The creep compliance is determined simultaneously with the structural relaxation under a constant uniaxial load below yield at constant temperature. The model successfully captures universal features found experimentally in polymer glasses, including signatures of mechanical rejuvenation. We analyze microscopic relaxation timescales and show that they exhibit the same aging characteristics as the macroscopic creep compliance. In addition, our model indicates that the entire distribution of relaxation times scales identically with age. Despite large changes in mobility, we observe comparatively little structural change except for a weak logarithmic increase in the degree of short-range order that may be correlated to an observed decrease in aging with increasing load.

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“…The direct visualization of local plastic events and the associated complex avalanching dynamics is supported by many experimental [11][12][13][14] or numerical [15][16][17] studies. In the "solid phase" corresponding to a strong dynamical arrest, soft-glassy systems display ageing properties manifesting in a slow creep relaxation process [18][19][20][21]. Ageing properties stem from a remaining thermal activation providing the possibility to cross enthalpic or entropic barriers and progressively set the system into deeper local minima where mechanical solidity is reinforced.…”

mentioning

confidence: 99%

Mechanical fluctuations suppress the threshold of soft-glassy solids: The secular drift scenario

et al. 2015

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We propose a dynamical mechanism leading to the fluidization by external mechanical fluctuations of soft-glassy amorphous material driven below the yield-stress. The model is based on the combination of memory effect and non-linearity, leading to an accumulation of tiny effects over a long-term. We test this scenario on a granular packing driven mechanically below the Coulomb threshold. We bring evidences for an effective viscous response directly related to small stress modulations in agreement with the theoretical prediction of a generic secular drift. We finally propose to extend this result more generally, to a large class of glassy systems.PACS numbers: 81.40. Lm, 83.80.Fg Numerous amorphous materials such as concentrated suspensions, colloidal glasses, foams or granular materials share common global features in their mechanical response to shear [1,2]. They are characterized by a yield stress below which the material appears as a solid [3,4]. As this behaviour is shared by so many different materials, several conceptual and theoretical frameworks emerged recently [5][6][7][8][9][10] to provide a quantitative basis for the phenomenology of soft glassy rheology (SGR) above and beyond the yield stress. Even though many parallel approaches exist, sometimes at different level of description, they all share either explicitly or implicitly, the underlying idea that mesoscopic collective processes triggered by thermal or mechanical activation, contribute to the material fluidity. The direct visualization of local plastic events and the associated complex avalanching dynamics is supported by many experimental [11][12][13][14] or numerical [15][16][17] studies. In the "solid phase" corresponding to a strong dynamical arrest, soft-glassy systems display ageing properties manifesting in a slow creep relaxation process [18][19][20][21]. Ageing properties stem from a remaining thermal activation providing the possibility to cross enthalpic or entropic barriers and progressively set the system into deeper local minima where mechanical solidity is reinforced. The existence of external mechanical noise was also proposed as a substitute for thermal activation. In this sense, the behaviour of these amorphous soft glassy solids is very close phenomenologically to molecular glass-formers obtained by thermal quenching [22]. Yet, the fact that such mechanical noise truly acts as an effective temperature is presently debated [23] and indeed, deep differences in the way thermal noise and mechanical fluctuations act in amorphous systems has been recently pointed out [24].

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Rheological Aging and Rejuvenation in Microgel Pastes

Cited by 311 publications

References 17 publications

Slow dynamics, aging, and glassy rheology in soft and living matter

Slow dynamics, aging, and glassy rheology in soft and living matter

Simulations of aging and plastic deformation in polymer glasses

Mechanical fluctuations suppress the threshold of soft-glassy solids: The secular drift scenario

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