Diffusion NMR for Determining the Homogeneous Length-Scale in Lamellar Phases.
(2008) In The Journal of Physical Chemistry Part B 112(10). p.2782-2794- Abstract
- The size of the anisotropic domains in a lyotropic liquid crystal is estimated using a new protocol for diffusion NMR. Echo attenuation decays are recorded for different durations of the displacement-encoding gradient pulses, while keeping the effective diffusion time and the range of the wave vectors constant. Deviations between the sets of data appear if there are non-Gaussian diffusion processes occurring on the time-scale defined by the gradient pulse duration and the length-scale defined by the wave vector. The homogeneous length-scale is defined as the minimum length-scale for which the diffusion appears to be Gaussian. Simulations are performed to show that spatial variation of the director orientation in an otherwise homogeneous... (More)
- The size of the anisotropic domains in a lyotropic liquid crystal is estimated using a new protocol for diffusion NMR. Echo attenuation decays are recorded for different durations of the displacement-encoding gradient pulses, while keeping the effective diffusion time and the range of the wave vectors constant. Deviations between the sets of data appear if there are non-Gaussian diffusion processes occurring on the time-scale defined by the gradient pulse duration and the length-scale defined by the wave vector. The homogeneous length-scale is defined as the minimum length-scale for which the diffusion appears to be Gaussian. Simulations are performed to show that spatial variation of the director orientation in an otherwise homogeneous system is sufficient to induce non-Gaussian diffusion. The method is demonstrated by numerical solutions of the Bloch-Torrey equation and experiments on a range of lamellar liquid crystals with different domain sizes. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1041986
- author
- Åslund, Ingrid LU ; Cabaleiro-Lago, Celia LU ; Söderman, Olle LU and Topgaard, Daniel LU
- organization
- publishing date
- 2008
- type
- Contribution to journal
- publication status
- published
- subject
- in
- The Journal of Physical Chemistry Part B
- volume
- 112
- issue
- 10
- pages
- 2782 - 2794
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- pmid:18271569
- wos:000253784700007
- scopus:42449120153
- pmid:18271569
- ISSN
- 1520-5207
- DOI
- 10.1021/jp076174l
- language
- English
- LU publication?
- yes
- id
- 33347250-47fb-4676-b1a8-5f89267c77db (old id 1041986)
- date added to LUP
- 2016-04-01 14:55:27
- date last changed
- 2022-01-28 03:10:04
@article{33347250-47fb-4676-b1a8-5f89267c77db,
abstract = {{The size of the anisotropic domains in a lyotropic liquid crystal is estimated using a new protocol for diffusion NMR. Echo attenuation decays are recorded for different durations of the displacement-encoding gradient pulses, while keeping the effective diffusion time and the range of the wave vectors constant. Deviations between the sets of data appear if there are non-Gaussian diffusion processes occurring on the time-scale defined by the gradient pulse duration and the length-scale defined by the wave vector. The homogeneous length-scale is defined as the minimum length-scale for which the diffusion appears to be Gaussian. Simulations are performed to show that spatial variation of the director orientation in an otherwise homogeneous system is sufficient to induce non-Gaussian diffusion. The method is demonstrated by numerical solutions of the Bloch-Torrey equation and experiments on a range of lamellar liquid crystals with different domain sizes.}},
author = {{Åslund, Ingrid and Cabaleiro-Lago, Celia and Söderman, Olle and Topgaard, Daniel}},
issn = {{1520-5207}},
language = {{eng}},
number = {{10}},
pages = {{2782--2794}},
publisher = {{The American Chemical Society (ACS)}},
series = {{The Journal of Physical Chemistry Part B}},
title = {{Diffusion NMR for Determining the Homogeneous Length-Scale in Lamellar Phases.}},
url = {{http://dx.doi.org/10.1021/jp076174l}},
doi = {{10.1021/jp076174l}},
volume = {{112}},
year = {{2008}},
}