Theory of dynamic arrest in colloidal mixtures

Juárez-Maldonado, R.; Medina‐Noyola, Magdaleno

doi:10.1103/physreve.77.051503

Cited by 72 publications

(96 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Clusterization ends up freeing some space in the system, allowing in this way faster diffusion. The same phenomenon is well known in colloid-polymer mixtures, where the depletion forces induced by the (small) polymers create strong density fluctuations in the colloidal phase, and increase its diffusion [35,36].…”

Section: Numerical Result: Diffusionmentioning

confidence: 80%

Diffusivity and weak clustering in a quasi-two-dimensional granular gas

Perera-Burgos¹,

Pérez-Ángel²,

Nahmad-Molinari³

2010

Phys. Rev. E

View full text Add to dashboard Cite

We present results from a detailed simulation of a quasi-2D dissipative granular gas, kept in a non-condensed steady state via vertical shaking over a rough substrate. This gas shows a weak power-law decay in the tails of its Pair Distribution Functions (PDF's), indicating fractality and therefore a tendency to form clusters over several size scales. This clustering depends monotonically on the dissipation coefficient, and disappears when the sphere-sphere collisions are conservative.Clustering is also sensitive to the packing fraction. This gas also displays the standard nonequilibrium characteristics of similar systems, including non-Maxwellian velocity distributions. The diffusion coefficients are calculated over all the conditions of the simulations, and it is found that diluted gases are more diffusive for smaller restitution coefficients.

show abstract

Section: Numerical Result: Diffusionmentioning

confidence: 80%

Diffusivity and weak clustering in a quasi-two-dimensional granular gas

Perera-Burgos¹,

Pérez-Ángel²,

Nahmad-Molinari³

2010

Phys. Rev. E

View full text Add to dashboard Cite

show abstract

“…There are other realizations of a binary Yukawa system in dusty plasmas [33][34][35] and metallic mixtures [36] or amorphous silica [37]. In fact, the binary Yukawa model has been widely used and employed to investigate effective interactions [38], fluid-fluid phase separation [31,39,40], vitrification [41][42][43][44][45] and transport properties [46]. In most studies of binary Yukawa systems, the nonadditivity parameter is set to zero, except for [31,32] where the effect of positive nonadditivity on fluid-fluid phase separation is considered.…”

Section: Introductionmentioning

confidence: 99%

Nonadditivity in the effective interactions of binary charged colloidal suspensions

Allahyarov

Löwen

2009

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Based on primitive model computer simulations with explicit microions, we calculate the effective interactions in a binary mixture of charged colloids with species A and B for different size and charge ratios. An optimal pairwise interaction is obtained by fitting the many-body effective forces. This interaction is close to a Yukawa (or Derjaguin-Landau-Verwey-Overbeek (DLVO)) pair potential but the AB cross-interaction is different from the geometric mean of the two direct AA and BB interactions. As a function of charge asymmetry, the corresponding nonadditivity parameter is first positive, then significantly negative and is then positive again. We finally show that an inclusion of nonadditivity within an optimal effective Yukawa model gives better predictions for the fluid pair structure than DLVO theory.

show abstract

“…As pointed out, one way to distinguish these glasses experimentally would be a marked difference in elastic properties. The structure of the large-x glass bears resemblance to certain types of sweets [27] such as Italian torroncino. The distinction is only strict for size ratios δ < δ c .…”

mentioning

confidence: 99%

“…The possible interplay with equilibrium phases is ignored here. The resulting glasstransition diagram is a unique prediction of MCT, distinct from other theories that have been put forward [27], and testable in simulation or experiment.Numerical calculations follow the method of Ref. [25].…”

mentioning

confidence: 99%

Multiple glasses in asymmetric binary hard spheres

Voigtmann

2011

EPL

128

112

View full text Add to dashboard Cite

Multiple distinct glass states occur in binary hard-sphere mixtures with constituents of very disparate sizes according to the mode-coupling theory of the glass transition (MCT), distinguished by considering whether small particles remain mobile or not, and whether small particles contribute significantly to perturb the big-particle structure or not. In the idealized glass, the four different glasses are separated by sharp transitions that give rise to higher-order transition phenomena involving logarithmic decay laws, and to anomalous power-law-like diffusion. The phenomena are argued to be expected generally in glass-forming mixtures. PACS numbers: pacs tbdMany glass formers and virtually all simple model systems for slow dynamics are mixtures of some sort. Close to a glass transition generic mixing effects appear, such as dramatic changes in viscosity induced by small composition changes [1,2], that are relevant for applications and may help to shed light on the microscopic processes driving glass formation.Even more interesting is the possibility to form qualitatively distinct types of glass, depending on mixture composition and constituents. Taking for example binary mixtures with sufficiently disparate constituents, a glass can form where some (slow) species freeze, but a fast component is able to diffuse through the voids left in the amorphous packing. This scenario is particularly relevant for transport through heterogeneous disordered media [3][4][5][6][7] or glassy ion conductors [8,9]. The simplest model are binary hard-sphere mixtures with large size disparity, where experiments on colloidal suspensions indeed found, depending on relative concentration, a partially frozen "single glass" with mobile small particles, separate from a "double glass" where both particle species freeze [10,11]. In mixtures of star polymers [12][13][14] yet another kind of glass emerged, termed "asymmetric" because it is characterized by few big particles frozen in a small-particle matrix, rendering the big-particle nearestneighbor cages highly nonspherical. It was, however, argued to be a hallmark of the ultra-soft interactions typical for the star polymers.Another kind of glass intuitively argued for is the "attractive glass" famous from colloid-polymer mixtures where free polymer induces depletion attraction among the colloids. If that attraction is weak, the glass that forms is essentially hard-sphere like or "repulsive", while at sufficiently strong and short-ranged attraction, a new glass driven by bonding and not nearest-neighbor cageing appears. Based on extensively tested predictions of the mode-coupling theory of the glass transition (MCT) for a square-well model system [15][16][17][18][19][20], one expects the two glasses to be separated by a glass-glass transition crossing which, for example, the elastic moduli of the glass exhibit sharp changes. Considering the generality of the depletion-interaction mechanism [21], one may indeed expect a similar glass-glass transition to be present in binary mixtures quite ge...

show abstract

Theory of dynamic arrest in colloidal mixtures

Cited by 72 publications

References 56 publications

Diffusivity and weak clustering in a quasi-two-dimensional granular gas

Diffusivity and weak clustering in a quasi-two-dimensional granular gas

Nonadditivity in the effective interactions of binary charged colloidal suspensions

Multiple glasses in asymmetric binary hard spheres

Contact Info

Product

Resources

About