Glass and percolation transitions in dense attractive micellar system

Mallamace, Francesco; Beneduci, Roberto; Gambadauro, P.; Lombardo, Domenico; Chen, S.H.

doi:10.1016/s0378-4371(01)00465-4

Cited by 25 publications

(18 citation statements)

References 27 publications

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“…What is more, percolation lines are frequently observed in attractive colloidal suspensions. According to the particular physical situation, the percolation threshold is associated with a sharp change in the following quantities ): i) Electrical conductivity in water-in-oil microemulsions (Chen et al, 1994;Weigert et al, 1997), ii) Viscosity of triblock copolymer micellar solutions (Mallamace et al, 1999(Mallamace et al, , 2001, iii) Elastic modulus of dispersions of silica spheres grafted with polymer chains (Grant and Russel, 1993), and iv) Correlation functions, measured by dynamic light scattering, of dispersions of silica spheres coated with stearyl alcohol (Verduin and Dhont, 1995). It is worth noting that in all these cases the percolation line passes in the vicinity of the critical point.…”

Section: Discussionmentioning

confidence: 99%

Clusters in simple fluids

Sator

2003

Physics Reports

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This article concerns the correspondence between thermodynamics and the morphology of simple fluids in terms of clusters. Definitions of clusters providing a geometric interpretation of the liquid-gas phase transition are reviewed with an eye to establishing their physical relevance. The author emphasizes their main features and basic hypotheses, and shows how these definitions lead to a recent approach based on self-bound clusters. Although theoretical, this tutorial review is also addressed to readers interested in experimental aspects of clustering in simple fluids.

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Section: Discussionmentioning

confidence: 99%

Clusters in simple fluids

Sator

2003

Physics Reports

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“…Since the interactions involved in the self-assembly at long range are generally soft temperature can have a crucial role and, by modifying the system volume fraction and solution conditions, novel structural transitions can be induced, as demonstrated by different studies [60,61].…”

Section: Block Copolymersmentioning

confidence: 99%

How self-assembly of amphiphilic molecules can generate complexity in the nanoscale

Calandra

Caschera

Liveri

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…In fact, Baxter's solution is often used to to analyze experimental results for systems as diverse as silica suspensions [8], copolymer micelles [9], and the fluid phase of lysozyme [10].…”

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confidence: 99%

Competition of Percolation and Phase Separation in a Fluid of Adhesive Hard Spheres

2003

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Using a combination of Monte Carlo techniques, we locate the liquid-vapor critical point of adhesive hard spheres. We find that the critical point lies deep inside the gel region of the phase diagram. The (reduced) critical temperature and density are τc = 0.1133 ± 0.0005 and ρc = 0.508 ± 0.01. We compare these results with the available theoretical predictions. Using a finite-size scaling analysis, we verify that the critical behavior of the adhesive hard sphere model is consistent with that of the 3D Ising universality class.PACS numbers: 61.20.Ja, 64.70.Ja The structure of a simple liquid is well described by that of a system of hard spheres at the same effective density. To a good approximation, the effect of attractive interactions on the liquid structure can be ignored. This feature of simple liquids is implicit in the Van der Waals theory for the liquid-vapor transition, and has been made explicit in the highly successful thermodynamic perturbation theories for simple liquids [1]. The perturbation approach becomes exact as the range of the attractive interaction tends to infinity while its integrated strength remains constant [3]. We refer to this limit as the 'Van der Waals' (VDW) limit [2]. Conversely, as the attractive forces become shorter-ranged and stronger, the perturbation approach is likely to break down. Fluids with strong, short-ranged attraction (so-called 'energetic' fluids [4]) are of growing importance in the area of complex liquids. For example, short-range attractions are thought to be responsible for the transition from a 'repulsive' to an 'attractive' glass [4], which has recently been observed experimentally in PMMA (polymethylmethacrylate) dispersions [6].In this Letter, we consider a model system that can be considered as the prototypical energetic fluid: a fluid of adhesive hard spheres (AHS). Introduced in 1968 [7], the AHS model is a reference system for particles with short range attractions. The pair potential consists of an impenetrable core plus a surface adhesion term that favors configurations where spheres are in contact. At larger separations, there is no interaction. The AHS model can be considered as the 'anti Van der Waals' limit.Baxter showed [7] that the Percus-Yevick (PY) equation can be solved analytically for adhesive hard spheres. In fact, Baxter's solution is often used to to analyze experimental results for systems as diverse as silica suspensions [8], copolymer micelles [9], and the fluid phase of lysozyme [10].One important feature of the AHS model is that its phase diagram contains a liquid-vapor coexistence region [11]. The PY equation offers different routes to estimate the location of the liquid-vapor critical point. However, the 'compressibility route' [7] and the 'energy route' [12] lead to estimates for the critical temperature that differ by some 20%, while the estimates for the critical density differ by almost a factor of three. For the analysis of experimental data, it is important to know the location of the critical point more accurately. The ...

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Glass and percolation transitions in dense attractive micellar system

Cited by 25 publications

References 27 publications

Clusters in simple fluids

Clusters in simple fluids

How self-assembly of amphiphilic molecules can generate complexity in the nanoscale

Competition of Percolation and Phase Separation in a Fluid of Adhesive Hard Spheres

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