论文标题
NMR表面放松在时间依赖的多孔系统中
NMR surface relaxivity in a time-dependent porous system
论文作者
论文摘要
我们在时间依赖的$^{1} \ mathrm {h} $ nmr放松时间限制在保湿多孔材料中的水时，我们证明了意外的衰减回收行为。我们的观察结果是通过考虑减小材料孔径和不断发展的界面化学的综合作用来合理化的，这有助于表面限制和扩散限制的弛豫方案之间的过渡。这种行为需要实现时间不断发展的表面松弛性，从而突出了从复杂多孔系统获得的NMR松弛数据的经典解释中的潜在警告。
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.
