title: Application of a portable nuclear magnetic resonance surface probe to porous media.
abstract: A portable nuclear magnetic resonance (NMR) surface probe was used to determine the time-dependent self-diffusion coefficient D(t) of water molecules in two fluid-filled porous media. The measuring equipment and the inhomogeneous magnetic fields in the sensitive volume of the probe are described. It is discussed how to evaluate D(t) using a surface probe from the primary and stimulated echoes generated in three-pulse experiments. Furthermore, the evaluation of D(t) allows one to determine the geometrical structure of porous materials.
authors.affiliation: Fraunhofer Institute for Non-Destructive Testing (IZFP), Building E 3.1, University, D 66123 Saarbrücken, Germany.
authors.forename: Andriy
authors.initials: A
authors.lastname: Marko
authors.forename: Bernd
authors.initials: B
authors.lastname: Wolter
authors.forename: Walter
authors.initials: W
authors.lastname: Arnold
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation* / Q000379:methods; D008280:Magnetics / Q000295:instrumentation*; D008422:Materials Testing / Q000295:instrumentation* / Q000379:methods; D008904:Miniaturization; D016062:Porosity; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D014159:Transducers; D014867:Water / Q000032:analysis* / Q000737:chemistry*
chemical_list: D014867:Water; D012822:Silicon Dioxide