Search

The new NMR method, demonstrated in the present work, allows within local small volumes the determination of integral structural parameters like the surface‐to‐pore volume ratio or the tortuosity of a fluid‐filled porous medium. A combination of conventional imaging (MRI) with measurements of observation‐time dependent self‐diffusion (dynamic imaging) was used.

The NMR flow‐imaging system is capable to determine quantitative flow‐ and fluid parameters. The parabolic velocity profiles for Poiseuille flow of water and the constant velocity spectra in one‐ and two‐tube systems show quantitative agreement with theoretical considerations. The relation of the maximum velocities in the two‐tube system and the velocity distribution function turned out to be characteristic features to distinguish quantitatively the flow properties of Newtonian and non‐Newtonian fluids.

No abstracts.

The NMR‐MOUSE is a dedicated NMR‐device for relaxation measurements in surface‐near volume elements of arbitrarily large objects. The concept as well as possible applications in soft matter science are discussed, and further developments are outlined. The magnetic fields of the device are inherently highly inhomogeneous, so that relaxation rates are accessible, whereas spectral chemical shift information cannot be obtained. In consideration of the rather small polarizing magnetic field, almost all studies are performed using 1H NMR because of the high sensitivity and the large natural abundance of protons. Pulse sequences and their properties in inhomogeneous fields are discussed; effects of multi‐echo sequences are described. Different properties of soft matter can empirically be related to an effective transverse relaxation parameter T2eff.

No abstract.

Review: 98 refs.