Diffusion NMR Methods Applied to Xenon Gas for Materials Study
| dc.creator | Mair, R. W. | |
| dc.creator | Rosen, M. S. | |
| dc.creator | Wang, R. | |
| dc.creator | Cory, D. G. | |
| dc.creator | Walsworth, R. L. | |
| dc.date | 2002-11-09 | |
| dc.date.accessioned | 2026-07-07T02:48:07Z | |
| dc.date.available | 2026-07-07T02:48:07Z | |
| dc.description | We report initial NMR studies of i) xenon gas diffusion in model heterogeneous porous media, and ii) continuous flow laser-polarized xenon gas. Both areas utilize the Pulsed Gradient Spin Echo techniques in the gas-phase, with the aim of obtaining more sophisticated information than just translational self-diffusion coefficients - a brief overview of this area is provided in the introduction. The heterogeneous or multiple-length scale model porous media consisted of random packs of mixed glass beads of two different sizes. We focus on observing the approach of the time-dependent gas diffusion coefficient, D(t), (an indicator of mean squared displacement) to the long-time asymptote, with the aim of understanding the long-length scale structural information that may be derived from a heterogeneous porous system. The Pade approximation is used to interpolate D(t) data between the short and long time limits. Initial studies of continuous flow laser-polarized xenon gas demonstrate velocity-sensitive imaging of much higher flows than can generally be obtained with liquids (20 - 200 mm/s). Gas velocity imaging is, however, found to be limited to a resolution of about 1 mm/s due to the high diffusivity of gases compared to liquids. We also present the first gas-phase NMR scattering, or diffusive-diffraction, data: namely, flow-enhanced structural features in the echo attenuation data from laser-polarized xenon flowing through a 2 mm glass bead pack. | |
| dc.description | single pdf file including all figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0211179 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0211179 | |
| dc.identifier | Magnetic Resonance in Chemistry, 40, S29-S39 (2002) | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/20277 | |
| dc.subject | Soft Condensed Matter | |
| dc.subject | Materials Science | |
| dc.title | Diffusion NMR Methods Applied to Xenon Gas for Materials Study | |
| dc.type | text |