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实验测试核磁弛豫和扩散的定量微观模型，利用核磁共振（NMR）探测结构无序介孔固体中的气-液和固-液平衡。这将通过利用在统计无序链模型（SDCM）框架中对相平衡的理解所取得的最新进展来完成。后者首次提供了滞回区域内任何状态共存相域的几何构型，并因此提供了一个框架，用于解决本质上依赖于相构型的复杂物理现象。我们在这个项目中追求的总体目标是验证SDCM对扩散和核磁共振弛豫的预测，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，证明SDCM正确地描述了迟滞内任何状态的积分相组成。SDCM在扩散和弛豫定量描述中的成功应用将进一步证实其在准确预测相构型方面的有效性。如果目标实现，不仅我们对复杂相平衡下质量输运的理解将提升到定量水平，而且SDCM提供的相状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.