Arrest and Flow of Colloidal Glasses

Cates, Michael E.

doi:10.1007/s00023-003-0949-3

Cited by 36 publications

(36 citation statements)

References 29 publications

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“…Here we do not attempt to mediate between those who support and those who oppose the basic philosophy of MCT (see [8,9] for discussions). Instead, in sections 2-4, we outline three areas of recent work that examine the ability of MCT to deal with heterogeneous systems.…”

Section: Introductionmentioning

confidence: 99%

Theory and simulation of gelation, arrest and yielding in attracting colloids

Cates¹,

Fuchs²,

Kroy³

et al. 2004

J. Phys.: Condens. Matter

121

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We present some recent theory and simulation results addressing the phenomena of colloidal gelation at both high and low volume fractions, in the presence of short-range attractive interactions. We discuss the ability of mode-coupling theory and its adaptations to address situations with strong heterogeneity in density and/or dynamics. We include a discussion of the effect of attractions on the shear-thinning and yield behaviour under flow.

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Section: Introductionmentioning

confidence: 99%

Theory and simulation of gelation, arrest and yielding in attracting colloids

Cates¹,

Fuchs²,

Kroy³

et al. 2004

J. Phys.: Condens. Matter

121

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show abstract

“…The viscoelastic properties around the glass transition have been investigated recently for both hard spheres and soft spheres (Mason & Weitz 1995;Cloitre et al 2003;Crassous et al 2005;Helgeson et al 2007;Koumakis et al 2008;Le Grand & Petekidis 2008;Carrier & Petekidis 2009). Mode coupling theory (MCT) provides a powerful theoretical framework for a variety of colloidal glasses (Cates 2003;Fuchs & Cates 2003;Holmes et al 2005;Kobelev & Schweizer 2005a,b). Recent experimental work with model colloidal systems explored analogies between hard-and soft-sphere suspensions (Vlassopoulos 2004;Crassous et al 2005;Gopalakrishnan et al 2005;Le Grand & Petekidis 2008).…”

Section: Introductionmentioning

confidence: 99%

Ageing and yield behaviour in model soft colloidal glasses

Christopoulou

Petekidis

Erwin

et al. 2009

Phil. Trans. R. Soc. A.

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We use multi-arm star polymers as model soft colloids with tuneable interactions and explore their behaviour in the glassy state. In particular, we perform a systematic rheological study with a well-defined protocol and address aspects of ageing and shear melting of star glasses. Ageing proceeds in two distinct steps: a fast step of O(10 3 s) and a slow step of O(10 4 s). We focus on creep and recovery tests, which reveal a rich, albeit complex response. Although the waiting time, the time between pre-shear (rejuvenation) of the glassy sample and measurement, affects the material's response, it does not play the same role as in other soft glasses. For stresses below the yield value, the creep curve is divided into three regimes with increasing time: viscoplastic, intermediate steady flow (associated with the first ageing step) and long-time evolving elastic solid. This behaviour reflects the interplay between ageing and shear rejuvenation. The yield behaviour, as investigated with the stress-dependent recoverable strain, indicates a highly nonlinear elastic response intermediate between a low-stress Hookean solid and a highstress viscoelastic liquid, and exemplifies the distinct characteristics of this class of hairy colloids. It appears that a phenomenological classification of different colloidal glasses based on yielding performance may be possible.

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“…From the Smoluchowski equation (or the corresponding nonlinear Langevin equation for the density ρ(r) [7,17]), one can derive a hierarchy of equations of motion for correlators such as S(q, t), more conveniently expressed via Φ(q, t) ≡ S(q, t)/S(q). Factoring arbitrarily the four-point correlators that arise in this hierarchy into products of two Φ's, one obtains a closed equation of motion for the two point correlatoṙ…”

Section: Mode Coupling Theory (Mct)mentioning

confidence: 99%

“…which confirms this statement [3,4] (as does related work on spin-glass models, [5]). That model shows a range of interesting flow behaviour, some of which might be useful in describing dense colloidal suspensions; however, we review here a different, complementary, approach [6][7][8][9][10]. This is based on mode coupling theory (MCT) and is limited in scope to address the steady state flow curve: it cannot, as yet, address either ageing or time-dependent flows.…”

Section: Introductionmentioning

confidence: 99%

Yielding and Jamming of Dense Suspensions

Cates

Jamming, Yielding, and Irreversible Deformation in Condensed Matter

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Recent progress in the understanding of yielding and jamming of colloids, based on extensions of the mode coupling theory (MCT) of glasses, is reviewed. This includes schematic extensions to shear-thickening fluids based on the ad-hoc introduction of a stress-dependent vertex in MCT. The possible distinction between dynamic and static yield stress, and its implications for shear-banding and other instabilities, is considered. Finally, what we know about systems where steady stress leads to unsteady flow or vice versa ("rheochaos") is briefly summarised.

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Arrest and Flow of Colloidal Glasses

Cited by 36 publications

References 29 publications

Theory and simulation of gelation, arrest and yielding in attracting colloids

Theory and simulation of gelation, arrest and yielding in attracting colloids

Ageing and yield behaviour in model soft colloidal glasses

Yielding and Jamming of Dense Suspensions

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