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Systèmes Hétérogènes Lyophobes: Influence de la température et de la vitesse sur les cycles d'intrusion/extrusion forcées de liquides non mouillants dans des matériaux mésoporeux

Abstract : A lyophobic heterogeneous system consists of a mesoporous material and a nonwetting liquid in relation to this material. By exerting an external pressure on the system, one can force the liquid to penetrate the pores and then to come out by decreasing the pressure. The resulting pressure hysteresis is significant of an energy dissipation which can be used for very specific damping applications sought by the space industry. To understand the physics governing the intrusion and extrusion of liquid in pores of nanometer size, and to characterize the influence of temperature and velocity on the system are the main objectives of this study. An original testing apparatus was designed to carry out intrusion/extrusion cycles, using different liquids and mesoporous silicas, at frequencies ranging from 0.01 to 20 Hz and temperatures between 20 and 80°C. These experiments proved that the water/hydrophobic mesoporous silica works up to 20 Hz. Theories of macroscopic thermodynamics (capillarity theory and nucleation model) were used to explain the experimental measurements. The very good agreement between experiments and theory showed the need to take into account the line tension in the nucleation energy required for the extrusion. Thus, a value of the water line tension was determined experimentally.
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https://tel.archives-ouvertes.fr/tel-00696340
Contributor : Ludivine Guillemot <>
Submitted on : Sunday, June 17, 2012 - 5:12:39 PM
Last modification on : Thursday, October 15, 2020 - 9:00:03 AM
Long-term archiving on: : Tuesday, September 18, 2012 - 2:22:35 AM

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  • HAL Id : tel-00696340, version 2

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Ludivine Guillemot. Systèmes Hétérogènes Lyophobes: Influence de la température et de la vitesse sur les cycles d'intrusion/extrusion forcées de liquides non mouillants dans des matériaux mésoporeux. Science des matériaux [cond-mat.mtrl-sci]. INSA de Lyon, 2010. Français. ⟨tel-00696340v2⟩

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