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

本项目的主要目标是开发和测试核磁弛豫和扩散的实验定量微观模型，如使用核磁共振（NMR）探测的那样，用于结构无序中孔固体中的气液和固液平衡。这将通过从最近的进展中获得的统计无序链模型（SDCM）的框架中的相平衡的理解中获益。后者提供了，第一次，几何配置的共存的相位域内的滞后区域的任何状态，并提供，因此，一个框架，用于解决复杂的物理现象本质上取决于相位配置。我们追求这个项目的全球目标是验证SDCM对扩散和NMR弛豫的预测，并释放其描述更广泛的复杂物理过程的潜力。我们已经获得了令人信服的证据，SDCM正确地描述了积分相组成的任何状态内的滞后。SDCM的成功应用，扩散和弛豫的定量描述将进一步证实其有效性，在相结构的准确预测。如果这些目标得以实现，不仅我们对复杂相平衡下的质量输运的理解将提高到定量水平，而且SDCM提供的相态的准确表征也将得到额外的支持。

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.