NMR Surface Relaxivity in a Time-Dependent Porous System
Neil Robinson, Razyq Nasharuddin, Einar O. Fridjonsson, Michael L. Johns
Abstract
We demonstrate an unexpected decay-recovery behavior in the time-dependent ^{1}H 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.
Topics & Concepts
Relaxation (psychology)PorosityChemical physicsMaterials sciencePorous mediumDiffusionSurface (topology)Nuclear magnetic resonanceNanotechnologyThermodynamicsChemistryPhysicsComposite materialPsychologyGeometrySocial psychologyMathematicsNMR spectroscopy and applicationsAdvanced NMR Techniques and ApplicationsSeismic Imaging and Inversion Techniques