NMR surface relaxivity in a time-dependent porous system

作者：Neil Robinson, Razyq Nasharuddin, Einar O. Fridjonsson, Michael L. Johns · 发表于：UWA Profiles and Research Repository (University of Western Australia) · 年份：2022 · DOI：10.48550/arxiv.2210.06016 · 被引用次数：1 · 研究领域：NMR spectroscopy and applications、Advanced NMR Techniques and Applications、Advanced MRI Techniques and Applications

We demonstrate an unexpected decay-recovery behaviour in the time-dependent $^{1}\mathrm{H}$ NMR relaxation times of water confined within a hydrating porous material. Our observations are rationalised by considering the combined effects of decreasing material pore size and evolving interfacial chemistry, which facilitate a transition between surface-limited and diffusion-limited relaxation regimes. Such behaviour necessitates the realisation of temporally evolving surface relaxivity, highlighting potential caveats in the classical interpretation of NMR relaxation data obtained from complex porous systems.