The role of quench rate in colloidal gels

Royall, C. Patrick; Malins, Alex

doi:10.1039/c2fd20041d

Cited by 27 publications

(47 citation statements)

References 42 publications

(94 reference statements)

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“…[9] which report the effect of collective motion on gelation, are restricted to a narrow range of system parameters (ρ, /k B T ,α), determining the onset of gelation. Other simulation parameters, including the optimum displacement size, the simulation ensemble, particle shape, or the quench or compression (crunch) rate [42], may also affect the structure of the gel. One can thus imagine a whole class of possible studies examining the affect of collective motion on gel formation, or crystallization, in attractive colloidal or molecular systems, making use of cluster algorithms of this kind.…”

Section: Discussionmentioning

confidence: 99%

Collective translational and rotational Monte Carlo moves for attractive particles

Růžička

Allen

2014

Phys. Rev. E

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Original citation:Růžička, Štěpán and Allen, M. P.. (2014) Copies of full items can be used for personal research or study, educational, or not-for profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way.Publisher's statement: ©2014 American Physical Society Published version: http://dx.doi.org/10.1103/PhysRevE.89.033307 A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. Virtual move Monte Carlo is a Monte Carlo (MC) cluster algorithm forming clusters via local energy gradients and approximating the collective kinetic or dynamic motion of attractive colloidal particles. We carefully describe, analyze, and test the algorithm. To formally validate the algorithm through highlighting its symmetries, we present alternative and compact ways of selecting and accepting clusters which illustrate the formal use of abstract concepts in the design of biased MC techniques: the superdetailed balance and the early rejection scheme. A brief and comprehensive summary of the algorithms is presented, which makes them accessible without needing to understand the details of the derivation.

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Section: Discussionmentioning

confidence: 99%

Collective translational and rotational Monte Carlo moves for attractive particles

Růžička

Allen

2014

Phys. Rev. E

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“…Physical gels are on the other hand low-density network structures with bonds that can be broken/realigned by thermal fluctuations within finite timescales [7]. One possible nonequilibrium path to physical gelation is via a thermal quench across the liquid-gas spinodal leading to dynamically arrested states [11][12][13][14], that show complex aging phenomena [15,16]. In general, these paths lead to spatially heterogeneous structures.…”

Section: Introductionmentioning

confidence: 99%

Relaxation dynamics in a transient network fluid with competing gel and glass phases

Chaudhuri

Hurtado

Berthier

et al. 2015

The Journal of Chemical Physics

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We use computer simulations to study the relaxation dynamics of a model for oil-in-water microemulsion droplets linked with telechelic polymers. This system exhibits both gel and glass phases and we show that the competition between these two arrest mechanisms can result in a complex, three-step decay of the time correlation functions, controlled by two different localization lengthscales. For certain combinations of the parameters, this competition gives rise to an anomalous logarithmic decay of the correlation functions and a subdiffusive particle motion, which can be understood as a simple crossover effect between the two relaxation processes. We establish a simple criterion for this logarithmic decay to be observed. We also find a further logarithmically slow relaxation related to the relaxation of floppy clusters of particles in a crowded environment, in agreement with recent findings in other models for dense chemical gels. Finally, we characterize how the competition of gel and glass arrest mechanisms affects the dynamical heterogeneities and show that for certain combination of parameters these heterogeneities can be unusually large. By measuring the four-point dynamical susceptibility, we probe the cooperativity of the motion and find that with increasing coupling this cooperativity shows a maximum before it decreases again, indicating the change in the nature of the relaxation dynamics. Our results suggest that compressing gels to large densities produces novel arrested phases that have a new and complex dynamics.

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“…(1) by a Gaussian distribution in σ with 4% standard deviation (the same value as the experimental system). For details of our BD simulation methods, see [51]. Unless otherwise indicated, runs are equilibrated for 168τ B (close to the value in the experiments).…”

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confidence: 99%

Probing Colloidal Gels at Multiple Length Scales: The Role of Hydrodynamics

et al. 2015

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Colloidal gels are out-of-equilibrium structures, made up of a rarefied network of colloidal particles. Comparing experiments to numerical simulations, with hydrodynamic interactions switched off, we demonstrate the crucial role of the solvent for gelation. Hydrodynamic interactions suppress the formation of larger local equilibrium structures of closed geometry, and instead lead to the formation of highly anisotropic threads, which promote an open gel network. We confirm these results with simulations which include hydrodynamics. Based on three-point correlations, we propose a scale-resolved quantitative measure for the anisotropy of the gel structure. We find a strong discrepancy for interparticle distances just under twice the particle diameter between systems with and without hydrodynamics, quantifying the role of hydrodynamics from a structural point of view.

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The role of quench rate in colloidal gels

Cited by 27 publications

References 42 publications

Collective translational and rotational Monte Carlo moves for attractive particles

Collective translational and rotational Monte Carlo moves for attractive particles

Relaxation dynamics in a transient network fluid with competing gel and glass phases

Probing Colloidal Gels at Multiple Length Scales: The Role of Hydrodynamics

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