Relaxation functions and dynamical heterogeneities in a model of chemical gel interfering with glass transition

Candia, A. de; Fierro, Annalisa; Pastore, Raffaele; Ciamarra, Massimo Pica; Coniglio, Antonio

doi:10.1140/epjst/e2016-60175-x

Cited by 3 publications

(1 citation statement)

References 34 publications

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“…1 (d)) resemble fluids with suspended "beads" of gels [40]. In the arrested states, the long time behavior of Q(t), which is the analog of the zero-wavevector, four-point susceptibility, χ 4 (q = 0, t) [52], resembles that observed at small wave vectors in a model of chemical gelation [53]. A striking feature of the arrested and non-arrested states at high activities is the appearance of "voids".…”

Section: Dynamical Heterogeneity and Activity-induced Agingmentioning

confidence: 87%

Arrested states in persistent active matter: Gelation without attraction

Merrigan

Ramola

Chatterjee

et al. 2020

Phys. Rev. Research

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We explore phase separation and kinetic arrest in active hard-core particles, in the limit of infinite persistence time of their active orientation. The passive limit of the model we consider, namely crossshaped particles on a square lattice, exhibits a first order transition from a fluid phase to a solid phase with increasing density. Quenches into the two-phase coexistence region exhibit a crossover from a simple fluid to an extremely slowly coarsening regime in which concentrated immobile clusters with local crystalline order emerge. These states represent an aging passive glass in this system. Adding persistent, yet small, active bias to the particle dynamics enhances and speeds up the aggregation of such clusters of immobile particles, creating states that resemble the passive glass at lower densities. For large active bias, the dense, immobile clusters proliferate until a spanning network bridges the system leading to percolation of an arrested phase, reminiscent of gelation in attracting colloids. Active particles remaining within the voids inside this network collect to form an interface which "wets" the surface of the arrested solid. We use an asymmetric simple exclusion process to map out a non-equilibrium phase diagram for this system. The phase diagram exhibits intriguing similarities to that of attracting colloids, however, we observe novel phases such as solid-liquid-void states that have no analogue in systems with zero activity.

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Section: Dynamical Heterogeneity and Activity-induced Agingmentioning

confidence: 87%

Arrested states in persistent active matter: Gelation without attraction

Merrigan

Ramola

Chatterjee

et al. 2020

Phys. Rev. Research

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Interplay between the glass and the gel transition

Fierro

Candia

Coniglio

2019

Sci. China Phys. Mech. Astron.

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The Interplay between the Theories of Mode Coupling and of Percolation Transition in Attractive Colloidal Systems

Mallamace

Mensitieri

Luna

et al. 2022

IJMS

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In the recent years a considerable effort has been devoted to foster the understanding of the basic mechanisms underlying the dynamical arrest that is involved in glass forming in supercooled liquids and in the sol-gel transition. The elucidation of the nature of such processes represents one of the most challenging unsolved problems in the field of material science. In this context, two important theories have contributed significantly to the interpretation of these phenomena: the Mode-Coupling theory (MCT) and the Percolation theory (PT). These theories are rooted on the two pillars of statistical physics, universality and scale laws, and their original formulations have been subsequently modified to account for the fundamental concepts of Energy Landscape (EL) and of the universality of the fragile to strong dynamical crossover (FSC). In this review, we discuss experimental and theoretical results, including Molecular Dynamics (MD) simulations, reported in the literature for colloidal and polymer systems displaying both glass and sol-gel transitions. Special focus is dedicated to the analysis of the interferences between these transitions and on the possible interplay between MCT and PT. By reviewing recent theoretical developments, we show that such interplay between sol-gel and glass transitions may be interpreted in terms of the extended F13 MCT model that describes these processes based on the presence of a glass-glass transition line terminating in an A3 cusp-like singularity (near which the logarithmic decay of the density correlator is observed). This transition line originates from the presence of two different amorphous structures, one generated by the inter-particle attraction and the other by the pure repulsion characteristic of hard spheres. We show here, combining literature results with some new results, that such a situation can be generated, and therefore experimentally studied, by considering colloidal-like particles interacting via a hard core plus an attractive square well potential. In the final part of this review, scaling laws associated both to MCT and PT are applied to describe, by means of these two theories, the specific viscoelastic properties of some systems.

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Relaxation functions and dynamical heterogeneities in a model of chemical gel interfering with glass transition

Cited by 3 publications

References 34 publications

Arrested states in persistent active matter: Gelation without attraction

Arrested states in persistent active matter: Gelation without attraction

Interplay between the glass and the gel transition

The Interplay between the Theories of Mode Coupling and of Percolation Transition in Attractive Colloidal Systems

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