Pulsed field gradient NMR diffusion measurement in nanoporous materials

Abstract Labeling in diffusion measurements by pulsed field gradient (PFG) NMR is based on the observation of phase nuclear spins acquired a constant magnetic with purposefully superimposed gradients. This labeling does no way affect microdynamics and provides information about probability distribution molecular displacements as function time. An introduction measuring principle followed detailed description ranges their limitation. Particular emphasis given to an explanation possible pitfalls ways circumvent them. Showcases presented for illustrating wealth provided PFG include survey various patterns concentration dependence intra-particle examples transport inhibition additional resistances within nanoporous particles external surface. The latter attained combination outcome tracer exchange experiments, which are shown become via special formalism data analysis. Further evidence concerns enhancement pore hierarchies, anisotropy impact chemical conversion porous catalysts. A compilation specifics parallels other measurement techniques concludes paper.