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NMR diffusometry and the short gradient pulse limit approximation

Malmborg, Carin LU ; Topgaard, Daniel LU and Söderman, Olle LU (2004) In Journal of Magnetic Resonance 169(1). p.85-91
Abstract
In NMR diffusometry, one often uses the short gradient pulse (SGP) limit approximation in the interpretation of data from systems with restricted diffusion. The SGP limit approximation means that the gradient pulse length, delta, is so short that the spins do not diffuse during the pulse duration, but this condition is rarely met. If the length scale of the pores corresponds to the molecular mean square displacement during the gradient pulse, the measured echo intensities become a function of the gradient pulse length. Here, we have studied highly concentrated emulsions to show how the length of the gradient pulse influences NMR diffusion experiments. We have focused on molecules confined to one pore and molecules that can migrate through... (More)
In NMR diffusometry, one often uses the short gradient pulse (SGP) limit approximation in the interpretation of data from systems with restricted diffusion. The SGP limit approximation means that the gradient pulse length, delta, is so short that the spins do not diffuse during the pulse duration, but this condition is rarely met. If the length scale of the pores corresponds to the molecular mean square displacement during the gradient pulse, the measured echo intensities become a function of the gradient pulse length. Here, we have studied highly concentrated emulsions to show how the length of the gradient pulse influences NMR diffusion experiments. We have focused on molecules confined to one pore and molecules that can migrate through the porous system. For the former the echo decays give smaller pores than the actual case and for the latter we show large changes in echo decay depending on the gradient pulse length, everything else being equal. (C) 2004 Elsevier Inc. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
NMR, Diffusometry, SGP, Short gradient pulse limit approximation, Restricted diffusion, Concentrated emulsions
in
Journal of Magnetic Resonance
volume
169
issue
1
pages
85 - 91
publisher
Elsevier
external identifiers
  • pmid:15183360
  • wos:000222161900011
  • scopus:2942555359
ISSN
1096-0856
DOI
10.1016/j.jmr.2004.04.004
language
English
LU publication?
yes
id
5e768fa7-c936-4b1b-ba6f-ed4314d33967 (old id 154006)
date added to LUP
2007-07-11 16:17:35
date last changed
2017-01-01 06:37:11
@article{5e768fa7-c936-4b1b-ba6f-ed4314d33967,
  abstract     = {In NMR diffusometry, one often uses the short gradient pulse (SGP) limit approximation in the interpretation of data from systems with restricted diffusion. The SGP limit approximation means that the gradient pulse length, delta, is so short that the spins do not diffuse during the pulse duration, but this condition is rarely met. If the length scale of the pores corresponds to the molecular mean square displacement during the gradient pulse, the measured echo intensities become a function of the gradient pulse length. Here, we have studied highly concentrated emulsions to show how the length of the gradient pulse influences NMR diffusion experiments. We have focused on molecules confined to one pore and molecules that can migrate through the porous system. For the former the echo decays give smaller pores than the actual case and for the latter we show large changes in echo decay depending on the gradient pulse length, everything else being equal. (C) 2004 Elsevier Inc. All rights reserved.},
  author       = {Malmborg, Carin and Topgaard, Daniel and Söderman, Olle},
  issn         = {1096-0856},
  keyword      = {NMR,Diffusometry,SGP,Short gradient pulse limit approximation,Restricted diffusion,Concentrated emulsions},
  language     = {eng},
  number       = {1},
  pages        = {85--91},
  publisher    = {Elsevier},
  series       = {Journal of Magnetic Resonance},
  title        = {NMR diffusometry and the short gradient pulse limit approximation},
  url          = {http://dx.doi.org/10.1016/j.jmr.2004.04.004},
  volume       = {169},
  year         = {2004},
}