Composition fluctuations in polydisperse liquids: Glasslike effects well above the glass transition
| Autor: | Olivier Benzerara, Alexander N. Semenov, L. Klochko, J. P. Wittmer, Jörg Baschnagel, Céline Ruscher |
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| Přispěvatelé: | Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
[PHYS]Physics [physics] PACS numbers: 05.20.Jj 64.70.kj Thermodynamics Binary number 01 natural sciences Heat capacity 010305 fluids & plasmas Condensed Matter::Soft Condensed Matter Molecular dynamics Colloid 0103 physical sciences Compressibility Relaxation (physics) [PHYS.COND.CM-DS-NN]Physics [physics]/Condensed Matter [cond-mat]/Disordered Systems and Neural Networks [cond-mat.dis-nn] 010306 general physics Structure factor Glass transition ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Physical Review E Physical Review E, American Physical Society (APS), 2020, 102 (4), ⟨10.1103/PhysRevE.102.042611⟩ |
| ISSN: | 2470-0045 2470-0053 |
| DOI: | 10.1103/PhysRevE.102.042611⟩ |
| Popis: | We study a two-dimensional glass-forming system of slightly polydisperse (LJ) particles using molecular dynamics simulations and demonstrate that in the liquid regime (well above the vitrification temperature) this model shows a number of features typical of the glass transition: (i) the relation between compressibility and structure factor $S(q)$ is strongly violated; (ii) the dynamical structure factor $S(q,t)$ at low $q$ shows a two-step relaxation; (iii) the time-dependent heat capacity ${c}_{v}(t)$ shows a long-time power-law tail. We show that these phenomena can be rationalized with the idea of composition fluctuations and provide a quantitative theory for the effects (i) and (ii). It implies that such effects must be inherent in all polydisperse colloidal models, including binary LJ mixtures. |
| Databáze: | OpenAIRE |
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