Hard spheres glasses

A. Van Blaaderen and P. Wiltzius Real-Space Structure of CoUoidal Hard-Sphere Glasses. Science 270, 1177 (1995). 

Mode-Coupling Theory and Colloidal Hard-Sphere Glasses 215... 

Interestingly, this slip behaviour of hard-sphere glasses is different in nature from that found earlier by Meeker et al. in jammed systems of emulsion droplets [60]. There, a non-linear elasto-hydrodynamic lubrication model, appropriate for deformable particles, could quantitatively account for their observations. It therefore appears that, while slip is ubiquitous for yield stress fluids flowing along smooth walls, the mechanism for its occurrence can be highly system dependent. 

For instance, studies of Tg (P) evolution up to 12 GPa lead to the possible link between molecular and colloidal glasses, before often considered as separate cases for the vitrification. This issue is discussed in the inset in Fig. 1. The main part of the plot presents one more unusual behaviour - the possible maximum of Tg(P) under extreme pressures. Consequently, the sequence liquid - glass - liquid - (hard sphere) glass on pressurization can be advised in some glass forming... 

Fig. 16. Comparison of radial distribution functions g(r) for samples of 4000 soft spheres (SS, Ref. 91), 500 hard spheres (HS, Ref. 10), and 216 LJ particles (Ref. 12) in the glass transformation region. Three soft-sphere states have been chosen to show structural changes on cooUng from above the freezing temperature (0.57 at po —1.0) to below the glass transition temperature (0.24 at pa = 1.0). The hard-sphere glass is at pohs basis of per-...

The depletion interaction gives rise to a new glass state in colloids, the attractive glass (Eckert and Bartsch 2002, Pham et al. 2002). The attractive glass, in contrast to the hard-sphere glass, possesses both a repulsive and attractive potential and is therefore a more accurate model of molecular glasses. 

Eigure 13.13 A sketch of state diagram of a colloid-polymer mixture redrawn from Zaccarelli and Poon (2009). Their simulations show that four distinct states exist ergodic fluid nonbonded repulsive glass (hard-sphere glass), bonded repulsive glass (attractive glass) and dense gel. 

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