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(317) Production(s) de KOB W.

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Relaxation dynamics in a simple glass former
Auteur(s): Kob W.
Conférence invité: Frontiers and directions in condesed matter physics (Bangalore, IN, 2009-05-25)
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Higher order correlation functions in glass-forming liquids
Auteur(s): Kob W.
Conférence invité: Discussion meeting on relaxation in complex system (Rome, IT, 2009-09-04)
Résumé: Résumé (à complèter)
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Diffusion processes in glass-forming systems
Auteur(s): Kob W.
Conférence invité: Diffusion Fundamentals III (Athene, GR, 2009-08-23)
Résumé: Résumé (à complèter)
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Compressing silica glass: Insight from combuter simulation
Auteur(s): Kob W.
Conférence invité: XII International conference on the physics of non-crystalline solids (Foz do Iguacu, BR, 2009-09-06)
Résumé: Résumé (à complèter)
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Computer simulations of glasses
Auteur(s): Kob W.
(Séminaires)
Penn State (Penn State, US), 2009-04-22 |

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Computer simulations of glasses
Auteur(s): Kob W.
(Séminaires)
Lehigh (Lehigh, US), 2009-04-21 |

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Out-of-equilibrium dynamics of a fractal model gel 
Auteur(s): Suarez M.-A., Kern N., Pitard E., Kob W.
(Article) Publié:
The Journal Of Chemical Physics, vol. 130 p. (2009)
Ref HAL: hal-04798090_v1
DOI: 10.1063/1.3129247
Exporter : BibTex | endNote
Résumé: Using molecular dynamics computer simulations we investigate the dynamics of a gel. We start from a fractal structure generated by the diffusion limited cluster aggregation-deflection algorithm, onto which we then impose an interaction potential consisting of a short-range attraction as well as a long-range repulsion. After relaxing the system at zero temperature, we let it evolve at a fixed finite temperature. Depending on the temperature T we find different scenarios for the dynamics. For T≳0.2 the fractal structure is unstable and breaks up into small clusters which relax to equilibrium. For T≲0.2 the structure is stable and the dynamics slows down with increasing waiting time. At intermediate and low T the mean squared displacement scales as t2/3 and we discuss several mechanisms for this anomalous time dependence. For intermediate T, the self-intermediate scattering function is given by a compressed exponential at small wave vectors and by a stretched exponential at large wave vectors. In contrast, for low T it is a stretched exponential for all wave vectors. This behavior can be traced back to a subtle interplay between elastic rearrangements, fluctuations of chainlike filaments, and heterogeneity.
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