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(305) Production(s) de KOB W.
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Dynamics of a rod in a homogeneous.in homogeneous frozen disordered medium : Correlation functions and non-Gaussian effects
Auteur(s): Moreno A. J., Kob W.
Conférence invité: Slow Dynamics in Complex Systems (Melville, USA - Sendai, Japan, FR, 2003)
Actes de conférence: AIP Conference Proceedings, vol. 708 p.576-582 (2003)
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Atomistic simulation of transport phenomena in simple and complex fluids and fluid mixtures
Auteur(s): Binder K., Horbach J., Kob W., Varnik R.
Conférence invité: Computational Physics of Transport and Interface Dynamics. in Lecture notes in computational science and engineering. vol. 32 (Dresden, Germany, FR, 2002-02-18)
Actes de conférence: Springer, Berlin, vol. p.226-248 (2003) (2003)
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Growing length scales in a supercooled liquid close to an interface 
Auteur(s): Scheidler Peter, Kob W., Binder Kurt, Parisi Giorgio
(Article) Publié:
Philosophical Magazine B, vol. 82 p.283 (2002)
Texte intégral en Openaccess : 
Ref HAL: hal-00113268_v1
Ref Arxiv: cond-mat/0104382
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: We present the results of molecular dynamics computer simulations of a simple glass former close to an interface between the liquid and the frozen amorphous phase of the same material. By investigating F_s(q,z,t), the incoherent intermediate scattering function for particles that have a distance z from the wall, we show that the relaxation dynamics of the particles close to the wall is much slower than the one for particles far away from the wall. For small z the typical relaxation time for F_s(q,z,t) increases like exp(Delta/(z-z_p)), where Delta and z_p are constants. We use the location of the crossover from this law to the bulk behavior to define a first length scale tilde{z}. A different length scale is defined by considering the Ansatz F_s(q,z,t) = F_s^{bulk}(q,t) +a(t) exp[-(z/xi(t))^{beta(t)}], where a(t), xi(t), and beta(t) are fit parameters. We show that this Ansatz gives a very good description of the data for all times and all values of z. The length xi(t) increases for short and intermediate times and decreases again on the time scale of the alpha-relaxation of the system. The maximum value of xi(t) can thus be defined as a new length scale xi_max. We find that tilde{z} as well as xi_max increase with decreasing temperature. The temperature dependence of this increase is compatible with a divergence of the length scale at the Kauzmann temperature of the bulk system.
Commentaires: 9 pages of Latex, 4 figures
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Dynamical Heterogeneities Below the Glass Transition.
Auteur(s): Vollmayr-Lee K., Kob W., Binder K., Zippelius A.
(Article) Publié:
The Journal Of Chemical Physics, vol. 116 p.5158-5166 (2002)
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Cooperative motion and growing length scales in supercooled confined liquids
Auteur(s): Scheidler Peter, Kob W., Binder Kurt
(Article) Publié:
Europhysics Letters (Epl), vol. 59 p.701-707 (2002)
Texte intégral en Openaccess :
Ref HAL: hal-00113269_v1
Ref Arxiv: cond-mat/0204164
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: Using molecular dynamics simulations we investigate the relaxation dynamics of a supercooled liquid close to a rough as well as close to a smooth wall. For the former situation the relaxation times increase strongly with decreasing distance from the wall whereas in the second case they strongly decrease. We use this dependence to extract various dynamical length scales and show that they grow with decreasing temperature. By calculating the frequency dependent average susceptibility of such confined systems we show that the experimental interpretation of such data is very difficult.
Commentaires: 7 pages of Latex, 3 figures
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The dynamics of sodium in sodium disilicate: Channel relaxation and sodium diffusion.
Auteur(s): Horbach J., Kob W., Binder K.
(Article) Publié:
Physical Review Letters, vol. 88 p.125502 (2002)
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The structural relaxation of molten sodium disilicate.
Auteur(s): Horbach J., Kob W.
(Article) Publié:
Journal Of Physics: Condensed Matter, vol. 14 p.9237-9253 (2002)
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