Etude rhéologique des électrolytes confinés en Appareil à Forces de Surfaces dynamique

Abstract : This thesis presents an experimental study of rheological properties of confined electrolytes and mechanics of electric double layer. In order to study simultaneously equilibrium and transport of confined electrolytes nearby charged surfaces, we developed a dynamic surface force apparatus. This technique enables both steady state measurements, as provided by common surface forces apparatus, and dynamic measurements that allow characterizing the transport phenomenona. First, we showed the existence of an over-dissipative behavior of weak electrolytes compared to a classical newtonian fluid. Furthermore we highlighted a frequency dependence of the EDL elastic behavior. Alongside, a theoretical approach completes and explains partially the experimental observations. Finally we studied the dynamics of ionic liquid, a type of concentrated electrolytes. We looked at the influence of a huge electric field, applied perpendicularly to the surfaces, on the viscosity and the properties of the liquid nearby the surfaces, as found in super- capacitors.
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Léo Garcia. Etude rhéologique des électrolytes confinés en Appareil à Forces de Surfaces dynamique. Matière Molle [cond-mat.soft]. Univ. Grenoble Alpes, 2016. Français. ⟨tel-01583258⟩

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