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Negi, D.; Trivedi, T.; Dhal, A.; Kumar, Suresh; Kumar, V.; Roy, S.; Raju, M. Kumar; Appannababu, S.; Mohanto, G.; Kaur, Jasmeet; Sinha, R. K.; Choudhury, D.; Singh, Devendra P.; Kumar, R.; Singh, R. P.; Muralithar, S.; Bhati, A. K.; Pancholi, S. C.; Bhowmik, R. K.

doi:10.1103/physrevc.85.057301

Cited by 16 publications

(21 citation statements)

References 15 publications

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“…Finally, aging laponite clay suspensions display a sigmoidal stress relaxation upon flow cessation with a characteristic time that scales inversely with the quench rate (Negi and Osuji, 2010b). The latter behavior contrasts with the simpler relaxation reported in dense systems with strong aging and remains to be interpreted from microscopic and/or theoretical points of view.…”

Section: (B)mentioning

confidence: 78%

“…III.C.2 together with the characteristic time scales involved in the yielding process. For stresses below the yield stress, the interplay between creep deformation and aging leads to longtime strain responses that are more complex than pure power-laws and strongly depend on the sample age, as reported for laponite clay suspensions (Baldewa and Joshi, 2012;Negi and Osuji, 2010a) and star glassy polymers (Christopoulou et al, 2009).…”

Section: Creep Experimentsmentioning

confidence: 90%

“…Another striking effect of confinement on yield stress fluids is the spectacular shear-induced structuration observed in the case of attractive particle systems at moderate shear rates, typically 0.1 <γ < 10 s −1 . Ex- amples include colloid polymer mixtures (DeGroot et al, 1994), flocculated magnetic suspensions (Navarrete et al, 1996), carbon nanotubes (Lin-Gibson et al, 2004), attractive emulsions (Montesi et al, 2004), carbon black and alumina dispersions (Grenard et al, 2011;Negi and Osuji, 2009;Osuji et al, 2008), and microfibrillated cellulose (Karppinen et al, 2012) [see Fig. 26].…”

Section: Yield Stress Materials In Confined Geometriesmentioning

confidence: 99%

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Yield stress materials in soft condensed matter

et al. 2017

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We present a comprehensive review of the physical behavior of yield stress materials in soft condensed matter, which encompass a broad range of materials from colloidal assemblies and gels to emulsions and non-Brownian suspensions. All these disordered materials display a nonlinear flow behavior in response to external mechanical forces, due to the existence of a finite force threshold for flow to occur: the yield stress. We discuss both the physical origin and rheological consequences associated with this nonlinear behavior, and give an overview of experimental techniques available to measure the yield stress. We discuss recent progress concerning a microscopic theoretical description of the flow dynamics of yield stress materials, emphasizing in particular the role played by relaxation time scales, the interplay between shear flow and aging behavior, the existence of inhomogeneous shear flows and shear bands, wall slip, and non-local effects in confined geometries.

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Section: (B)mentioning

confidence: 78%

Section: Creep Experimentsmentioning

confidence: 90%

Section: Yield Stress Materials In Confined Geometriesmentioning

confidence: 99%

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Yield stress materials in soft condensed matter

et al. 2017

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“…The yield stress in the corresponding regime showed logarithmic increase with respect to waiting time. According to the present model it appears that for Laponite suspension studied by Negi and Osuji, 58 relaxation time followed two different dependences on f : for…”

mentioning

confidence: 74%

A model for aging under deformation field, residual stresses and strains in soft glassy materials

Joshi

2015

Soft Matter

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A model is proposed that considers aging and rejuvenation in a soft glassy material as, respectively, a decrease and an increase in free energy. The aging term is weighted by an inverse of characteristic relaxation time suggesting that greater mobility of the constituents induces faster aging in a material. A dependence of relaxation time on free energy is proposed, which under quiescent conditions leads to a power law dependence of relaxation time on waiting time as observed experimentally. The model considers two cases, namely, a constant modulus when aging is entropy controlled and a time dependent modulus. In the former and the latter cases the model has, respectively, two and three experimentally measurable parameters that are physically meaningful. Overall, the model predicts how the material undergoes aging and approaches a rejuvenated state under the application of a deformation field. In particular, the model proposes distinctions between various kinds of rheological effects for different combinations of parameters. Interestingly, when the relaxation time evolution is stronger than linear, the model predicts various features observed in soft glassy materials such as thixotropic and constant yield stress, thixotropic shear banding, and the presence of residual stress and strain.

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“…In figure 6 we plot yield stress as well as yield strain data from the three groups as a function of w t . 73,99,100 Interestingly it can be seen that yield stress of Laponite dispersion first shows a constant value up to a certain w t followed by an increase. The corresponding yield strain, on the other hand, initially decreases with time over the duration for which yield stress is constant, and then remains constant.…”

Section: Soft Glassy Dynamicsmentioning

confidence: 96%

Microstructure and Soft Glassy Dynamics of an Aqueous Laponite Dispersion

2018

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Synthetic hectorite clay Laponite RD/XLG is composed of disk-shaped nanoparticles that acquire dissimilar charges when suspended in an aqueous medium. Owing to their property to spontaneously self-assemble, Laponite is used as a rheology modifier in a variety of commercial water-based products. In particular, an aqueous dispersion of Laponite undergoes a liquid-to-solid transition at about 1 vol % concentration. The evolution of the physical properties as the dispersion transforms to the solid state is reminiscent of physical aging in molecular as well as colloidal glasses. The corresponding soft glassy dynamics of an aqueous Laponite dispersion, including the rheological behavior, has been extensively studied in the literature. In this feature article, we take an overview of recent advances in understanding soft glassy dynamics and various efforts taken to understand the peculiar rheological behavior. Furthermore, the continuously developing microstructure that is responsible for the eventual formation of a soft solid state that supports its own weight against gravity has also been a topic of intense debate and discussion. In particularly, extensive experimental and theoretical studies lead to two types of microstructures for this system: an attractive gel-like or a repulsive glass-like structure. We carefully examine and critically analyze the literature and propose a state (phase) diagram that suggests an aqueous Laponite dispersion to be present in an attractive gel state.

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Shears mechanism in109In

Cited by 16 publications

References 15 publications

Yield stress materials in soft condensed matter

Yield stress materials in soft condensed matter

A model for aging under deformation field, residual stresses and strains in soft glassy materials

Microstructure and Soft Glassy Dynamics of an Aqueous Laponite Dispersion

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