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(307) Production(s) de KOB W.
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Predicting complex mineral structures using genetic algorithms ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Mohn Chris E., Kob W.
(Article) Publié:
Journal Of Physics: Condensed Matter, vol. 27 p.425201 (2015)
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Reply to Chakrabarty et al.: Particles move even in ideal glasses ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Ozawa M., Kob W., Ikeda A., Miyazaki Kunimasa
(Article) Publié:
Proceedings Of The National Academy Of Sciences Of The United States Of America, vol. 112 p.E4821-E4822 (2015)
Texte intégral en Openaccess : ![pubmedcentral](plugins/aigle//images/logo-pubmedcentral.png)
Ref HAL: hal-01208515_v1
DOI: 10.1073/pnas.1513323112
WoS: WOS:000360383200002
Exporter : BibTex | endNote
2 Citations
Résumé: In their letter, Chakrabarty et al. (1) point out that their data on the relaxation dynamics are inconsistent with the thermodynamic data presented in our paper (2). They argue that from their results and the predictions of the random first-order transition theory (3) one must conclude that our configurational entropy sc is “quantitatively not accurate.” In the following we will show that this conclusion is not necessarily valid.The main argument of Chakrabarty et al. (1) (figure 1, Left, of ref. 1) is that the self part of the intermediate scattering function Fs(k,t) decays to zero even in the glass phase (defined by sc=0) and that hence this phase …
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Relaxation dynamics in a transient network fluid with competing gel and glass phases ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Chaudhuri Pinaki, Hurtado Pablo I., Berthier L., Kob W.
(Article) Publié:
The Journal Of Chemical Physics, vol. 142 p.174503 (2015)
Texte intégral en Openaccess : ![arxiv](plugins/aigle//images/logo-arxiv.png)
Ref HAL: hal-01152155_v1
DOI: 10.1063/1.4919645
WoS: 000354258200032
Exporter : BibTex | endNote
15 Citations
Résumé: 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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