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<dc:title xml:lang="fr">Déformation non linéaire de suspensions colloïdales denses : étude par rhéologie et diffusion de la lumière</dc:title>
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<dc:subject xml:lang="fr">Colloïdes</dc:subject>
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<dc:subject xml:lang="fr">Rhéologie</dc:subject>
<dc:subject xml:lang="fr">Diffusion de la lumière</dc:subject>
<dc:subject xml:lang="fr">Effet Bauschinger</dc:subject>
<dc:subject xml:lang="fr">Formation de la mémoire</dc:subject>
<dc:subject xml:lang="en">Colloids</dc:subject>
<dc:subject xml:lang="en">Glass</dc:subject>
<dc:subject xml:lang="en">Rheology</dc:subject>
<dc:subject xml:lang="en">Light scattering</dc:subject>
<dc:subject xml:lang="en">Bauschinger effect</dc:subject>
<dc:subject xml:lang="en">Memory formation</dc:subject>
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<dcterms:abstract xml:lang="fr">Le suspensions colloïdales dence sont couramment utilisées pour différentes applications industrielles (production alimentaire, cosmétique). Les systèmes vitreux appartiennent également à cette classe de matériaux. Cependant, ses propriétés sous application de déformation ne sont pas bien étudiées, en particulier son image microscopique. Dans cette thèse, nous nous concentrons sur ce type de problème. Nos suspensions sont basées sur le système de particules colloïdales Hard Spheres bien réglé et caractérisé.Tout d’abord, nous avons effectué un ensemble de mesures rhéologiques non linéaires pour étudier des phénomènes tels que: le ramollissement des propriétés élastiques de notre système après pré–déformation (l’effet Bauschinger), la réponse d’hystérésis et la formation de mémoire dans notre système.Ensuite, nous utilisons un dispositif de diffusion de la lumière unique (développé par nos soins) pour étudier la structure et la dynamique de notre système modèle sous cisaillement stable et oscillatoire. Nous avons trouvé la dépendance entre le temps de relaxation microscopique et la ontrainte de cisaillement macroscopique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Dence colloidal suspensions are commonly used for different industrial applications (food production, cosmetics). Glassy systems also belong to this class of materials. However, its properties under application of deformation is not well studied, especially its microscopic picture. In this thesis we are focussed on this kind of problem. Our suspensions are based on the well tuned and characterized Hard Spheres colloidal particles system.First, we performed a set of non – linear rheological measurements to study such phenomena as: softening of the elastic properties of our system after pre – strain (the Bauschinger effect), hysteresis response and the memory formation in our system.Then we use a unique light scattering device (developed by us) to study the structure and dynamics of our model system under steady and oscillatory shear. We found the dependence between microscopic relaxation time and the macroscopic shear stress.</dcterms:abstract>
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