NMR surface relaxivity in a time-dependent porous system
arXiv:2210.06016 · doi:10.1103/PhysRevLett.130.126204
Abstract
We demonstrate an unexpected decay-recovery behaviour in the time-dependent 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.
12 pages, 2 figures