Abstract
We demonstrate an unexpected decay-recovery behavior in the time-dependent NMR relaxation times of water confined within a hydrating porous material. Our observations are rationalized 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 behavior necessitates the realization of temporally evolving surface relaxivity, highlighting potential caveats in the classical interpretation of NMR relaxation data obtained from complex porous systems.
- Received 14 October 2022
- Accepted 21 February 2023
DOI:https://doi.org/10.1103/PhysRevLett.130.126204
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