Dynamic processes at play within soft glassy materials
type: Dataset
description: This work is based on an experimental analysis of the dynamical processes which occur within soft glassy materials. The first part provides measurement results of nanotracers diffusion in Laponite (a colloidal suspension) obtained by a method of fluorescence recovery (FRAP). This study shows that the diffusion is affected by the concentration of Laponite as well as the size of the tracer. A hydrodynamic model with confined diffusion allows a quantitative description of the experimental data. In a second part, an experimental study is carried out, dealing with the aging processes of glassy materials. The theoretical concept of effective temperature is probed experimentally. The effective temperature is determined using the technique of FRAP, by simultaneously measuring diffusion and convection of fluorescent probes within the aging Laponite. Contrary to some measurements found in literature, results show that the system is controlled by the bath temperature. The following study then aims at characterizing the behavior of the sheared Laponite : an experimental device is developed in this perspective, by applying an electric field to the system and thus creating local deformations. However, the observed effect appears to be too low, with relatively large uncertainties (probably linked to the complexity of the system), which impede on the significance of our results. Finally, the properties of Carbopol, a yield stress fluid, are analyzed by measuring the dynamics of capillary rise. It is shown that the surface roughness of capillary strongly affects the rise of the fluid and that the latter is controlled by the rheology of the system, and more specifically by the yield stress value.
identifier: NNT: 2009LYO10123
issued: 2026-05-10T19:54:41.757225
language: fr
modified: 2026-05-10T19:54:41.757231
contact point: Organization
  fn: CCSD
keyword: ascension-capillaire
keyword: capillary-rise
keyword: carbopol
keyword: contrainte-seuil
keyword: diffusion
keyword: effective-temperature
keyword: infoeu-reposemanticsdoctoralthesis
keyword: laponite
keyword: milieux-vitreux-mous
keyword: physcondcm-genphysics-physicscondensed-matter-cond-matother-cond-matother
keyword: soft-glassy-materials
keyword: temperature-effective
keyword: theses
keyword: yield-stress
landing page: https://theses.hal.science/tel-00831474

Dynamic processes at play within soft glassy materials
type: Distribution
format: HTML
issued: 2026-05-10T19:54:41.786440
modified: 2026-05-10T19:54:41.732821
access URL: https://theses.hal.science/tel-00831474

test_moissonnage_selune
type: Agent