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(326) Production(s) de BERTHIER L.
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Thinning or thickening? Multiple rheological regimes in dense suspensions of soft particles
Auteur(s): Kawasaki T., Ikeda A., Berthier L.
(Article) Publié:
Europhysics Letters (Epl), vol. 107 p.28009 (2014)
Texte intégral en Openaccess :
Ref HAL: hal-01053378_v1
Ref Arxiv: 1404.4778
DOI: 10.1209/0295-5075/107/28009
WoS: 000340779900036
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
39 Citations
Résumé: The shear rheology of dense colloidal and granular suspensions is strongly nonlinear, as these materials exhibit shear-thinning and shear-thickening, depending on multiple physical parameters. We numerically study the rheology of a simple model of soft repulsive particles at large densities, and show that nonlinear flow curves reminiscent of experiments on real suspensions can be obtained. By using dimensional analysis and basic elements of kinetic theory, we rationalize these multiple rheological regimes and disentangle the relative impact of thermal fluctuations, glass and jamming transitions, inertia and particle softness on the flow curves. We characterize more specifically the shear-thickening regime and show that both particle softness and the emergence of a yield stress at the jamming transition compete with the inertial effects responsible for the observed thickening behaviour. This allows us to construct a dynamic state diagram, which can be used to analyze experiments.
Commentaires: 6 pages, 3 figures
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Clustering and heterogeneous dynamics in a kinetic Monte-Carlo model of self-propelled hard disks
Auteur(s): Levis D., Berthier L.
(Article) Publié:
Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 89 p.062301 (2014)
Texte intégral en Openaccess :
Ref HAL: hal-01025923_v1
PMID 25019770
Ref Arxiv: 1403.3410
DOI: 10.1103/PhysRevE.89.062301
WoS: 000336979500008
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
85 Citations
Résumé: We introduce a kinetic Monte-Carlo model for self-propelled hard disks to capture with minimal ingredients the interplay between thermal fluctuations, excluded volume and self-propulsion in large assemblies of active particles. We analyze in detail the resulting (density, self-propulsion) nonequilibrium phase diagram over a broad range of parameters. We find that purely repulsive hard disks spontaneously aggregate into fractal clusters as self-propulsion is increased, and rationalize the evolution of the average cluster size by developing a kinetic model of reversible aggregation. As density is increased, the nonequilibrium clusters percolate to form a ramified structure reminiscent of a physical gel. We show that the addition of a finite amount of noise is needed to trigger a nonequilibrium phase separation, showing that demixing in active Brownian particles results from a delicate balance between noise, interparticle interactions and self-propulsion. We show that self-propulsion has a profound influence on the dynamics of the active fluid. We find that the diffusion constant has a nonmonotonic behaviour as self-propulsion is increased at finite density and that activity produces strong deviations from Fickian diffusion that persist over large time scales and length scales, suggesting that systems of active particles generically behave as dynamically heterogeneous systems.
Commentaires: 17 pages, 13 figures Journal: Phys. Rev. E 89, 062301 (2014)
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Nonequilibrium glassy dynamics of self-propelled hard disks
Auteur(s): Berthier L.
(Article) Publié:
Physical Review Letters, vol. 112 p.220602 (2014)
Texte intégral en Openaccess :
Ref HAL: hal-01010555_v1
Ref Arxiv: 1307.0704
DOI: 10.1103/PhysRevLett.112.220602
WoS: 000336920800002
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
122 Citations
Résumé: We analyse the collective dynamics of self-propelled particles in the large density regime where passive particles undergo a kinetic arrest to an amorphous glassy state. We capture the competition between self-propulsion and crowding effects using a two-dimensional model of self-propelled hard disks, which we study using Monte-Carlo simulations. Although the activity drives the system far from equilibrium, self-propelled particles undergo a kinetic arrest, which we characterize in detail and compare with its equilibrium counterpart. In particular, the critical density for dynamic arrest continuously shifts to larger density with increasing activity, and the relaxation time is surprisingly well described by an algebraic divergence resulting from the emergence of highly collective dynamics. These results show that dense assemblies of active particles undergo a nonequilibrium glass transition which is profoundly affected by self-propulsion mechanisms.
Commentaires: 5 pages Journal: Phys. Rev. Lett. 112, 220602 (2014)
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Crossovers in the dynamics of supercooled liquids probed by an amorphous wall
Auteur(s): Hocky Glen M, Berthier L., Kob W., Reichman David R.
(Article) Publié:
Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 89 p.052311 (2014)
Texte intégral en Openaccess :
Ref HAL: hal-00998409_v1
PMID 25353804
Ref Arxiv: 1402.5974
DOI: 10.1103/PhysRevE.89.052311
WoS: 000336765000003
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
37 Citations
Résumé: We study the relaxation dynamics of a binary Lennard-Jones liquid in the presence of an amorphous wall generated from equilibrium particle configurations. In qualitative agreement with the results presented in Nature Phys. {\bf 8}, 164 (2012) for a liquid of harmonic spheres, we find that our binary mixture shows a saturation of the dynamical length scale close to the mode-coupling temperature $T_c$. Furthermore we show that, due to the broken symmetry imposed by the wall, signatures of an additional change in dynamics become apparent at a temperature well above $T_c$. We provide evidence that this modification in the relaxation dynamics occurs at a recently proposed dynamical crossover temperature $T_s > T_c$, which is related to the breakdown of the Stokes-Einstein relation. We find that this dynamical crossover at $T_s$ is also observed for a system of harmonic spheres as well as a WCA liquid, showing that it may be a general feature of glass-forming systems.
Commentaires: 9 pages, 7 figures
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Intermittent dynamics and logarithmic domain growth during the spinodal decomposition of a glass-forming liquid
Auteur(s): Testard V., Berthier L., Kob W.
(Article) Publié:
The Journal Of Chemical Physics, vol. 140 p.164502 (2014)
Texte intégral en Openaccess :
Ref HAL: hal-00991464_v1
PMID 24784282
Ref Arxiv: 1309.1587
DOI: 10.1063/1.4871624
WoS: 000336047700043
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
57 Citations
Résumé: We use large-scale molecular dynamics simulations of a simple glass-forming system to investigate how its liquid-gas phase separation kinetics depends on temperature. A shallow quench leads to a fully demixed liquid-gas system whereas a deep quench makes the dense phase undergo a glass transition and become an amorphous solid. This glass has a gel-like bicontinuous structure that evolves very slowly with time and becomes fully arrested in the limit where thermal fluctuations become negligible. We show that the phase separation kinetics changes qualitatively with temperature, the microscopic dynamics evolving from a surface tension-driven diffusive motion at high temperature to a strongly intermittent, heterogeneous and thermally activated dynamics at low temperature, with a logarithmically slow growth of the typical domain size. These results shed light on recent experimental observations of various porous materials produced by arrested spinodal decomposition, such as nonequilibrium colloidal gels and bicontinuous polymeric structures, and they elucidate the microscopic mechanisms underlying a specific class of viscoelastic phase separation.
Commentaires: 18 pages
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Thermal and athermal yield stress
Auteur(s): Berthier L.
Conférence invité: Jamming, 15 years later (Paris, FR, 2013-06-21)
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Discussion of ``Transient dynamics in concentrated suspensions"
Auteur(s): Berthier L.
Conférence invité: From cooperativity in supercooled liquids to plasticity of amorphous solids (Zurich, CH, 2013-06-26)
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