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Transition vitreuse, hétérogénéité dynamique et vieillissement dans les systèmes a dynamique lente
(37) Production(s) de l'année 2023
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The colloidal glass transition rules the onset of shape instability in drying colloidal drops 
Auteur(s): Milani M., Ramos L., Cipelletti L., Ligoure C.
Conference: 19th International Rheology Conference (IRC) (Athènes, GR, 2023-07-29)
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Influence of the alkali modifier on the surface properties of silicate glasses
Auteur(s): Zhang Z., Ispas S., Kob W.
Conference: DGG-USTV JOINT ANNUAL MEETING (Orléans, FR, 2023-05-22)
Ref HAL: hal-04859718_v1
Exporter : BibTex | endNote
Résumé: We have used large-scale molecular dynamics simulations in order to investigate the surface properties of lithium, sodium, and potassium silicate glasses containing 25 mol% of alkali oxide. We have studied two types of surfaces, a melt-formed surface (MS) and a fracture surface (FS), and we have found that the influence of the alkali modifier on the surface properties depends strongly on the nature of the surface. The MS show a saturation of elemental concentration when the alkali is changed from Na to K, while the FS exhibit a monotonic increase of modifier concentration with increasing the alkali size. For the FS we find that larger alkali ions reduce the concentration of under-coordinated Si atoms at the surface and increases the fraction of two-membered rings.For both types of surfaces, the surface roughness of the surfaces are found to increase with alkali size, with the effect being more pronounced for the FS than for the MS. The height-height correlation function of the surfaces show a scaling behavior that is independent of the alkali species considered: The one for the MS is compatible with the prediction of thefrozen capillary wave theory while the ones for the FS shows a logarithmic growth, i.e., on the nanoscale these surfaces are not self-affine fractals. The influence of the modifier on the surface properties are rationalized in terms of the interplay between multiple factors involving the size of the ions, bond strength, and charge balance on the surface.
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Glassy dynamics of ultralow cross-linked PNIPAM microgels
Auteur(s): Cipelletti L., Elancheliyan R., Truzzolillo D., Segers Niel
Conference: Colloque GdR Micropesanteur Fondamentale et Appliquée (Hyères, FR, 2023-10-24)
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Editorial: Probing out-of-equilibrium soft matter
Auteur(s): Bischofberger Irmgard, Castañeda-Priego Ramón, Cerbino Roberto, Cipelletti L., del Gado Emanuela, Fernández-Nieves Alberto
(Article) Publié:
Frontiers In Physics, vol. 11 p.1173632 (2023)
Texte intégral en Openaccess : 
Ref HAL: hal-04858567_v1
DOI: 10.3389/fphy.2023.1173632
Exporter : BibTex | endNote
Résumé: This Research Topic originates from the symposium Probing Out-of-Equilibrium Soft Matter that was held on October 22–23, 2021 at the University of Fribourg (Switzerland) to celebrate and honor the career of Véronique Trappe. The symposium assembled leading scientists in the rapidly growing field of non-equilibrium soft matter physics, a field to which V. Trappe has made key contributions that have changed the view of many [1–6]. While the equilibrium behaviour of soft matter is amply studied and understood, novel tools are needed to capture the complexity of out-of-equilibrium soft materials. A particular challenge is getting access to and understanding the fast processes occurring at the nano- and micro-scale of the elementary constituents, while simultaneously capturing the slower evolution of bulk properties in non-equilibrium conditions. To take on this task, new theoretical, numerical and experimental methodologies need to be developed that enable the investigation of the structure, dynamics, thermodynamics, and rheology of out-of-equilibrium soft matter. Adopting a comprehensive view that covers fundamental topics as well as research focusing on processes and issues faced in applications, this Research Topic aims to showcase some of the latest advancements and innovations in the field.
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