Ageing and collapse in gels with long-range attractions

Teece, Lisa J.; Faers, Malcolm A.; Bartlett, Paul

doi:10.1039/c0sm00626b

Cited by 75 publications

(99 citation statements)

References 50 publications

(69 reference statements)

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“…Particular attention has been given to the dynamical arrest transition from a fluid to a solid-like state [1]. It has been shown that weakly attractive colloids (U ∼ k B T ) at intermediate values of φ (∼ 0.1 − 0.4) can form stress-bearing networks as a result of the interplay between spinodal decomposition and structural arrest [2][3][4][5][6][7][8][9][10][11][12][13]. This represents an unconventional route to gelation, where the arrest occurs when the dense domains formed during spinodal decomposition undergo structural arrest and phase separation can no longer proceed, the system being arrested as a self supporting network.…”

mentioning

confidence: 99%

Unexpected Decoupling of Stretching and Bending Modes in Protein Gels

et al. 2013

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We show that gels formed by arrested spinodal decomposition of protein solutions exhibit elastic properties in two distinct frequency domains, both elastic moduli exhibiting a remarkably strong dependence on volume fraction. Considering the large difference between the protein size and the characteristic length of the network we model the gels as porous media and show that the high and low frequency elastic moduli can be respectively attributed to stretching and bending modes. The unexpected decoupling of the two modes in the frequency domain is attributed to the length scale involved: while stretching mainly relates to the relative displacement of two particles, bending involves the deformation of a strand with a thickness of the order of a thousand particle diameters.

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mentioning

confidence: 99%

Unexpected Decoupling of Stretching and Bending Modes in Protein Gels

et al. 2013

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“…26,[30][31][32] To rationalize gelation experiments, it is useful to know the tie lines of the equilibrium phase diagram, i.e. the composition of coexisting phases and their relative volumes.…”

mentioning

confidence: 99%

Phase behaviour of colloids with short-range repulsions plus nonadsorbing polymer chains

Gruijthuijsen¹,

Tuinier²,

Brader³

et al. 2013

Soft Matter

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The colloidal gas-liquid phase behaviour has been studied for aqueous mixtures of well-defined spherical particles with shortranged repulsions mixed with relatively monodisperse poly(ethylene oxide) polymers. We show that our set of experimental phase diagrams are in quantitative agreement with theoretical predictions using generalized free volume theory [G. J. Fleer and R. Tuinier, Phys. Rev. E, 2007, 76, 041802]. The determination of the equilibrium composition of coexisting phases reveals qualitative deviations between the two, for which we propose a tentative explanation.

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“…This so called gel state can be achieved using simple model interactions provided that the range of interaction is very small when compared with the typical size of the interacting particles [6][7][8][9][10]. The physical properties of the gel are intermediate between those of a solid and a liquid and there is considerable interest on them due to their numerous industrial, analytical and domestic applications [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Modeling polymeric gels: The role of chain fexibility on the structure of physical gels

Pereyra¹,

Al-Maadeed²,

Carignano³

2017

Express Polym. Lett.

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Abstract. Using molecular dynamics simulations and a simple model for chain molecules we study the gel formation under different conditions. The main characteristic of the model is the short attractive range of the non-bonding interaction, which leads to the formation of a single percolated cluster trapped in long lived metastable state that resemble the properties of polymeric physical gels. The gels are formed by imposing a sudden quenching on well equilibrated high temperature conformations. In particular, we investigated the effect of concentration and polymer persistence length on the resulting percolated structures. Using a Monte Carlo approach, we characterize the size of the cavities that develop inside the bulk of the gels. The results show that polymers with higher persistence length produce gel structures with smaller cavities.

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Ageing and collapse in gels with long-range attractions

Cited by 75 publications

References 50 publications

Unexpected Decoupling of Stretching and Bending Modes in Protein Gels

Unexpected Decoupling of Stretching and Bending Modes in Protein Gels

Phase behaviour of colloids with short-range repulsions plus nonadsorbing polymer chains

Modeling polymeric gels: The role of chain fexibility on the structure of physical gels

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