Relaxation Scenarios in a Mixture of Large and Small Spheres: Dependence on the Size Disparity

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dc.creatorMoreno, Angel J.
dc.creatorColmenero, Juan
dc.date2006-08-28
dc.date2007-03-29
dc.date.accessioned2026-07-07T07:54:40Z
dc.date.available2026-07-07T07:54:40Z
dc.descriptionWe present a computational investigation on the slow dynamics of a mixture of large and small soft spheres. By varying the size disparity at a moderate fixed composition different relaxation scenarios are observed for the small particles. For small disparity density-density correlators exhibit moderate stretching. Only small quantitative differences are observed between dynamic features for large and small particles. On the contrary, large disparity induces a clear time scale separation between the large and the small particles. Density-density correlators for the small particles become extremely stretched, and display logarithmic relaxation by properly tuning the temperature or the wavevector. Self-correlators decay much faster than density-density correlators. For very large size disparity, a complete separation between self- and collective dynamics is observed for the small particles. Self-correlators decay to zero at temperatures where density-density correlations are frozen. The dynamic picture obtained by varying the size disparity resembles features associated to Mode Coupling transition lines of the types B and A at, respectively, small and very large size disparity. Both lines might merge, at some intermediate disparity, at a higher-order point, to which logarithmic relaxation would be associated. This picture resembles predictions of a recent Mode Coupling Theory for fluids confined in matrixes with interconnected voids [V. Krakoviack, Phys. Rev. Lett. {\bf 94}, 065703 (2005)].
dc.descriptionJournal of Chemical Physics 125, 164507 (2006)
dc.identifierhttps://arxiv.org/abs/cond-mat/0608601
dc.identifierhttp://arxiv.org/abs/cond-mat/0608601
dc.identifierJournal of Chemical Physics 125, 164507 (2006)
dc.identifierdoi:10.1063/1.2361286
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/126699
dc.subjectSoft Condensed Matter
dc.titleRelaxation Scenarios in a Mixture of Large and Small Spheres: Dependence on the Size Disparity
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