Exploring complex phase states in structurally-disordered nanoporous solids with diffusion and nuclear magnetic relaxation measurements

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The main objective of the present project is to develop and to test experimentally quantitative microscopic models for nuclear magnetic relaxation and diffusion, as probed using nuclear magnetic resonance (NMR), for gas-liquid and solid-liquid equilibria in structurally-disordered mesoporous solids. This will be done by profiting from the recent progress obtained in the understanding of phase equilibria in the frame of the statistically disordered chain model (SDCM). The latter delivers, for the first time, geometric configurations of the coexisting phase domains for any state within the hysteresis region and offers, thus, a framework for addressing complex physical phenomena intrinsically depending on the phase configurations. The global goal we pursue with this project is to validate the predictions of SDCM for diffusion and NMR relaxation and to unlock its potentials for describing a broader spectrum of complex physical processes. We have already acquired convincing evidence that SDCM correctly describes the integral phase compositions for any state within the hysteresis. Successful application of SDCM to quantitative description of diffusion and relaxation shall further corroborate its validity in accurate predictions of the phase configurations. If the objectives are achieved, not only our understanding of mass transport under complex phase equilibria will advance to a quantitative level, but also an accurate characterization of the phase states, as provided by SDCM, will receive an additional support.