Les techniques de Résonance Magnétique Nucléaire appliquées à l'étude structurale de matériaux : imagerie et diffusion en milieux confinés

Abstract : Our recent interest for porous media with high opened porosity leads us to develop and use new tools based on Nuclear Magnetic Resonance (NMR) to characterize porous structures. NMR pulsed field gradients measurements of the restrained diffusion of confined fluids constitute an efficient method to probe the local geometry in a porous media. The evolution of the apparent diffusion coefficient (Dapp) yields average information on the surface / volume ratio of porosity and tortuosity of the network. Applying an Inverse Laplace Transform in the second dimension, experiments reveal a relationship between resonance frequencies and local geometry, confirmed by the exchange spectroscopy (EXSY). Another source of information (size and heterogeneity of the network) was given by the diffusive diffraction pattern, obtained on model samples (packed spheres embedded with water) and for the very first time on a reel porous polymer using B1 gradients.
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Theses
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http://docnum.univ-lorraine.fr/prive/SCD_T_2007_0141_KUNTZ.pdf
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https://hal.univ-lorraine.fr/tel-01748170
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Submitted on : Thursday, March 29, 2018 - 11:27:10 AM
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Jean-François Kuntz. Les techniques de Résonance Magnétique Nucléaire appliquées à l'étude structurale de matériaux : imagerie et diffusion en milieux confinés. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2007. Français. ⟨NNT : 2007NAN10141⟩. ⟨tel-01748170⟩

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