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Relaxométrie du proton pour l'étude de fluides à l'intérieur de milieux poreux

Abstract : In order to characterize molecular mobility within complex structures, NMR relaxometry aims at the determination of relaxation times in a frequency range as large as possible and in particular at very low frequencies where slow motions can be revealed. The evolution of the longitudinal relaxation rate R1 (which corresponds to the inverse of the longitudinal relaxation time T1) as a function of the measurement frequency leads to so-called dispersion curves. The work presented in this thesis is, for the first time in this laboratory, entirely dedicated to this technique, applied to the study of fluids within porous media. The systems investigated are very different; they include 1) hydrated mesoporous materials for which different states of water molecules were distinguished and 2) organogels formed in toluene, the dynamical behavior of which being studied subsequently to the gelation process. Original experimental methods, involving the use of several instruments, were developed, allowing us to obtain dispersion curves between 0 and 400 MHz. Thanks to methodological and theoretical developments, we were able to identify the different relaxation mechanisms and able to give a physical meaning to the parameters resulting from the fitting of dispersion curves
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Emilie Steiner. Relaxométrie du proton pour l'étude de fluides à l'intérieur de milieux poreux. Autre. Université Henri Poincaré - Nancy 1, 2011. Français. ⟨NNT : 2011NAN10121⟩. ⟨tel-01746273⟩

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