skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Multiphase imaging of gas flow in a nanoporous material usingremote detection NMR

Abstract

Pore structure and connectivity determine how microstructured materials perform in applications such as catalysis, fluid storage and transport, filtering, or as reactors. We report a model study on silica aerogel using a recently introduced time-of-flight (TOF) magnetic resonance imaging technique to characterize the flow field and elucidate the effects of heterogeneities in the pore structure on gas flow and dispersion with Xe-129 as the gas-phase sensor. The observed chemical shift allows the separate visualization of unrestricted xenon and xenon confined in the pores of the aerogel. The asymmetrical nature of the dispersion pattern alludes to the existence of a stationary and a flow regime in the aerogel. An exchange time constant is determined to characterize the gas transfer between them. As a general methodology, this technique provides new insights into the dynamics of flow in porous media where multiple phases or chemical species may be present.

Authors:
; ; ;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USDOE Director. Office of Science. Office of Basic EnergySciences. Materials Science and Engineering Division; US Department ofHomeland Security Fellowship
OSTI Identifier:
881740
Report Number(s):
LBNL-58951
R&D Project: 508601; BnR: KC0203010; TRN: US200613%%92
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nature Materials; Journal Volume: 5; Journal Issue: 4; Related Information: Journal Publication Date: 04/2006
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CATALYSIS; CHEMICAL SHIFT; DETECTION; GAS FLOW; MAGNETIC RESONANCE; PORE STRUCTURE; SILICA; STORAGE; TRANSPORT; XENON; NMR MRI remote detection aerogel flow

Citation Formats

Harel, Elad, Granwehr, Josef, Seeley, Juliette A., and Pines, Alex. Multiphase imaging of gas flow in a nanoporous material usingremote detection NMR. United States: N. p., 2005. Web.
Harel, Elad, Granwehr, Josef, Seeley, Juliette A., & Pines, Alex. Multiphase imaging of gas flow in a nanoporous material usingremote detection NMR. United States.
Harel, Elad, Granwehr, Josef, Seeley, Juliette A., and Pines, Alex. Mon . "Multiphase imaging of gas flow in a nanoporous material usingremote detection NMR". United States. doi:. https://www.osti.gov/servlets/purl/881740.
@article{osti_881740,
title = {Multiphase imaging of gas flow in a nanoporous material usingremote detection NMR},
author = {Harel, Elad and Granwehr, Josef and Seeley, Juliette A. and Pines, Alex},
abstractNote = {Pore structure and connectivity determine how microstructured materials perform in applications such as catalysis, fluid storage and transport, filtering, or as reactors. We report a model study on silica aerogel using a recently introduced time-of-flight (TOF) magnetic resonance imaging technique to characterize the flow field and elucidate the effects of heterogeneities in the pore structure on gas flow and dispersion with Xe-129 as the gas-phase sensor. The observed chemical shift allows the separate visualization of unrestricted xenon and xenon confined in the pores of the aerogel. The asymmetrical nature of the dispersion pattern alludes to the existence of a stationary and a flow regime in the aerogel. An exchange time constant is determined to characterize the gas transfer between them. As a general methodology, this technique provides new insights into the dynamics of flow in porous media where multiple phases or chemical species may be present.},
doi = {},
journal = {Nature Materials},
number = 4,
volume = 5,
place = {United States},
year = {Mon Oct 03 00:00:00 EDT 2005},
month = {Mon Oct 03 00:00:00 EDT 2005}
}