Dynamic heterogeneity in hard and soft sphere colloidal glasses

Rahmani, Yasser; Vaart, Kasper van der; Dam, Bart van; Hu, Zhibing; Chikkadi, Vijayakumar; Schall, Peter

doi:10.1039/c2sm25267h

Cited by 35 publications

(33 citation statements)

References 29 publications

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“…As is clear also from Table III, there are broad indications for heterogeneous dynamics as also assumed in our model, with a diverging associated length scale ξ when ϕ c is approached from below [10,45,49,50,52,53,57]. Note that the definition of ξ may vary here; in particular, both two-point and four-point correlations have been considered.…”

Section: Appendix C: Table Of Literature Datamentioning

confidence: 89%

“…In experiments [45,47,[49][50][51]57] and simulations [33,53,54,[65][66][67][68][69] such a divergent length scale has been observed both in the linear regime around ϕ c and when approaching the yield-stress line of quasistatic flow at higher concentrations ϕ. Since under stresses above the yield stress the stagnant phase starts flowing, we assume that under stress a fraction s of the particles remains stagnant in neighbor cages while the fraction 1-s becomes fluidized.…”

Section: Two-state Heterogeneous Dynamicsmentioning

confidence: 99%

“…The table includes additional overdamped experimental systems [45,56,57,72] which are supposed to be influenced, at least in part, by thermal effects.…”

Section: Appendix C: Table Of Literature Datamentioning

confidence: 99%

“…Heterogeneous microscopic dynamics is a frequently reported feature in various glassy or jamming systems investigated experimentally or by simulation, with a length scale of fluctuating cooperative motion well beyond the single-particle diameter, with a characteristic time scale of such fluctuations, and with accelerated particle motion under load [33,[39][40][41][42][43][44][45][46][47][48]. Several studies report a divergence of such properties in approach of the yield stress, with power laws in stress, rate, or distance | ϕ| [38,42,[49][50][51][52][53][54][55][56][57]. These observations have suggested that, in spite of important differences [47,[58][59][60], close analogies exist between glasses and jammed systems (see, e.g., Refs.…”

Section: Introductionmentioning

confidence: 99%

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Universal rescaling of flow curves for yield-stress fluids close to jamming

et al. 2015

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The experimental flow curves of four different yield-stress fluids with different interparticle interactions are studied near the jamming concentration. By appropriate scaling with the distance to jamming all rheology data can be collapsed onto master curves below and above jamming that meet in the shear-thinning regime and satisfy the Herschel-Bulkley and Cross equations, respectively. In spite of differing interactions in the different systems, master curves characterized by universal scaling exponents are found for the four systems. A two-state microscopic theory of heterogeneous dynamics is presented to rationalize the observed transition from Herschel-Bulkley to Cross behavior and to connect the rheological exponents to microscopic exponents for the divergence of the length and time scales of the heterogeneous dynamics. The experimental data and the microscopic theory are compared with much of the available literature data for yield-stress systems.

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Section: Appendix C: Table Of Literature Datamentioning

confidence: 89%

Section: Two-state Heterogeneous Dynamicsmentioning

confidence: 99%

“…The table includes additional overdamped experimental systems [45,56,57,72] which are supposed to be influenced, at least in part, by thermal effects.…”

Section: Appendix C: Table Of Literature Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Universal rescaling of flow curves for yield-stress fluids close to jamming

et al. 2015

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“…For instance, Schall and coworkers have shown [200] that softer interaction potentials have significantly larger four-point susceptibilities and and their dynamics are therefore more cooperative in nature. Further, in a seminal work, Weitz and coworkers demonstrating using DLS measurements that increasing the softness of the potential leads to a decrease in the fragility of the glass-forming liquid [201].…”

Section: Dynamical Heterogeneitymentioning

confidence: 99%

Deconstructing the glass transition through critical experiments on colloids

Gokhale

Sood

Ganapathy

2016

Advances in Physics

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The glass transition is the most enduring grand-challenge problem in contemporary condensed matter physics. Here, we review the contribution of colloid experiments to our understanding of this problem. First, we briefly outline the success of colloidal systems in yielding microscopic insights into a wide range of condensed matter phenomena. In the context of the glass transition, we demonstrate their utility in revealing the nature of spatial and temporal dynamical heterogeneity.We then discuss the evidence from colloid experiments in favor of various theories of glass formation that has accumulated over the last two decades. In the next section, we expound on the recent paradigm shift in colloid experiments from an exploratory approach to a critical one aimed at distinguishing between predictions of competing frameworks. We demonstrate how this critical approach is aided by the discovery of novel dynamical crossovers within the range accessible to colloid experiments. We also highlight the impact of alternate routes to glass formation such as random pinning, trajectory space phase transitions and replica coupling on current and future research on the glass transition. We conclude our review by listing some key open challenges in glass physics such as the comparison of growing static lengthscales and the preparation of ultrastable glasses, that can be addressed using colloid experiments.

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The Glass Transition

Mattsson¹

2016

Fluids, Colloids and Soft Materials: An Introduction to Soft Matter Physics

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Dynamic heterogeneity in hard and soft sphere colloidal glasses

Cited by 35 publications

References 29 publications

Universal rescaling of flow curves for yield-stress fluids close to jamming

Universal rescaling of flow curves for yield-stress fluids close to jamming

Deconstructing the glass transition through critical experiments on colloids

The Glass Transition

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