Aging behavior of Laponite clay particle suspensions

Knaebel, A.; Bellour, M.; Munch, J. P.; Viasnoff, Virgile; Lequeux, François; Harden, James L.

doi:10.1209/epl/i2000-00406-6

Cited by 191 publications

(209 citation statements)

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“…The dynamics of multiply scattering samples can be accessed with diffusing wave spectroscopy (DWS) [55]. Multispeckle DWS measurements of probe particles diffusing in aging clay suspensions are used to characterise the aging behaviour of the medium and have been reported in [7]. Conventional PCS experiments use a point detector and therefore require considerable time-averaging of the intensity autocorrelation function to ensure reasonable statistics.…”

Section: Experimental Techniquesmentioning

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.…”

mentioning

confidence: 99%

“…For dense materials such as glasses, sandpiles and foams, Liu and Nagel [22] suggest a 'jamming' phase diagram that considers the possibility of unjamming the system (i.e driving it towards ergodicity) by increasing its temperature, by applying appropriately large shear stresses, or by decreasing the density of its constituents. Universal non-diffusive slow dynamics and aging have been observed in a variety of jammed soft materials, for example, in colloidal suspensions [2,3,7,8,23,24], concentrated emulsions [2], micellar polycrystals [2] and lamellar gels [2,25]. Glassy dynamics also occur in biologically relevant systems.…”

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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: Experimental Techniquesmentioning

confidence: 99%

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confidence: 99%

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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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“…In other cases, for instance when the diffusing particle evolves in an aging medium such as a glassy colloidal suspension of Laponite [1]- [3], another equation of motion has to be used. We shall derive such an equation…”

Section: Equation Of Motion Of a Particle Linearly Coupled To An Out mentioning

confidence: 99%

“…Generally speaking, the medium in which a diffusing particle evolves may be, or not, in a state of thermodynamic equilibrium. For instance, when it is constituted by an aging medium such as a glassy colloidal suspension of Laponite [1]- [3], the environment of a diffusing particle is not in thermal equilibrium. This renders the analysis of the particle motion much more involved, as compared with the thermal equilibrium case.…”

Section: Introductionmentioning

confidence: 99%

Anomalous diffusion of a particle in an aging medium

Pottier

Mauger

2004

Physica A: Statistical Mechanics and its Applications

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We report new results about the anomalous diffusion of a particle in an aging medium. For each given age, the quasi-stationary particle velocity is governed by a generalized Langevin equation with a frequency-dependent friction coefficient proportional to |ω| δ−1 at small frequencies, with 0 < δ < 2. The aging properties of the medium are encoded in a frequency dependent effective temperature T eff. (ω). The latter is modelized by a function proportional to |ω| α at small frequencies, with α < 0, thus allowing for the medium to have a density of slow modes proportionally larger than in a thermal bath. Using asymptotic Fourier analysis, we obtain the behaviour at large times of the velocity correlation function and of the mean square displacement. As a result, the anomalous diffusion exponent in the aging medium appears to be linked, not only to δ as it would be the case in a thermal bath, but also to the exponent α characterizing the density of slow modes.

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Applications of Biopolymer Microgels

Pashkovski

2011

Microgel Suspensions

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IntroductionAs a result of their structural versatility, rich dynamic behavior, biocompatibility, and sustainability, biopolymer microgels are employed in a wide range of industrial applications. Most biopolymers are linear or branched macromolecules forming microgel particles due to intermolecular binding. As was discussed in previous chapters, an essential property of microgel particles is their ability to swell, thus occupying a large volume in solution at very low-weight fractions of polymer. In the case of synthetic microgels, swelling is due to osmotic effects and the equilibrium swelling ratio is given by a balance between the entropic elasticity of the macromolecules, the polymer-solvent interactions [1-3], and, for flexible polyelectrolytes, the ionic strength and/or solution pH. By contrast, microgels of biological origin are composed of relatively rigid macromolecules; it is this intrinsic rigidity that largely determines the swelling of these biopolymer microgels.Above a critical overlap, concentrated suspensions of microgel particles behave as jammed materials [4,5], or more precisely, as soft glassy materials [6], which possess both a high elastic modulus and a yield stress. In the linear viscoelastic regime, the stress relaxation is very slow because the stress relaxes via collective rearrangements of the microgel particles. This makes microgels ideal for applications in consumer and food industries, where they are used to stabilize emulsions and suspensions and to control the rheological characteristics of the products. Microgel particles formed by biopolymers are preferred in pharmaceutical, food, and oral care industries due to their natural origin and biocompatibility [7][8][9]. In addition, microgels of biological origin have found applications in oil recovery because of their high solubility in water, low sensitivity to temperature, and high thickening potential. Biogels also find applications in drug delivery, particularly for oral [10] and ocular [11] delivery.There are other important reasons for using microgels of biological origin. First, high prices of petrochemicals make synthetic microgels, such as polyacrylates or Microgel Suspensions: Fundamentals and Applications Edited

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Aging behavior of Laponite clay particle suspensions

Cited by 191 publications

References 19 publications

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

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

Anomalous diffusion of a particle in an aging medium

Applications of Biopolymer Microgels

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