Homogeneous length scale of shear-induced multilamellar vesicles studied by diffusion NMR.
(2011) In Journal of Magnetic Resonance 209. p.291-299- Abstract
- A recently developed protocol for pulsed gradient spin echo (PGSE) NMR is applied for the size determination of multilamellar vesicles (MLVs). By monitoring the self-diffusion behavior of water, the technique yields an estimate of the homogeneous length scale λ(hom), i.e. the maximum length scale at which there is local structural heterogeneity in a globally homogeneous material. A cross-over between local non-Gaussian to global Gaussian diffusion is observed by varying the experimentally defined length- and time-scales. Occasional observation of a weak Bragg peak in the PGSE signal attenuation curves permits the direct estimation of the MLV radius in favorable cases, thus yielding the constant of proportionality between λ(hom) and radius.... (More)
- A recently developed protocol for pulsed gradient spin echo (PGSE) NMR is applied for the size determination of multilamellar vesicles (MLVs). By monitoring the self-diffusion behavior of water, the technique yields an estimate of the homogeneous length scale λ(hom), i.e. the maximum length scale at which there is local structural heterogeneity in a globally homogeneous material. A cross-over between local non-Gaussian to global Gaussian diffusion is observed by varying the experimentally defined length- and time-scales. Occasional observation of a weak Bragg peak in the PGSE signal attenuation curves permits the direct estimation of the MLV radius in favorable cases, thus yielding the constant of proportionality between λ(hom) and radius. The microstructural origin of the Bragg peak is verified through Brownian dynamics simulations and a theoretical analysis based on the center-of-mass diffusion propagator. λ(hom) is decreasing with increasing shear rate in agreement with theoretical expectations and results from (2)H NMR lineshape analysis. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1831370
- author
- Åslund, Ingrid LU ; Medronho, Bruno LU ; Topgaard, Daniel LU ; Söderman, Olle LU and Schmidt, Claudia
- organization
- publishing date
- 2011
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Magnetic Resonance
- volume
- 209
- pages
- 291 - 299
- publisher
- Academic Press
- external identifiers
-
- wos:000289270900024
- pmid:21349752
- scopus:79953196787
- ISSN
- 1096-0856
- DOI
- 10.1016/j.jmr.2011.01.024
- language
- English
- LU publication?
- yes
- id
- 498ed6a1-5272-4477-ac99-0c54fedac61d (old id 1831370)
- date added to LUP
- 2016-04-01 14:19:26
- date last changed
- 2022-01-28 00:01:59
@article{498ed6a1-5272-4477-ac99-0c54fedac61d, abstract = {{A recently developed protocol for pulsed gradient spin echo (PGSE) NMR is applied for the size determination of multilamellar vesicles (MLVs). By monitoring the self-diffusion behavior of water, the technique yields an estimate of the homogeneous length scale λ(hom), i.e. the maximum length scale at which there is local structural heterogeneity in a globally homogeneous material. A cross-over between local non-Gaussian to global Gaussian diffusion is observed by varying the experimentally defined length- and time-scales. Occasional observation of a weak Bragg peak in the PGSE signal attenuation curves permits the direct estimation of the MLV radius in favorable cases, thus yielding the constant of proportionality between λ(hom) and radius. The microstructural origin of the Bragg peak is verified through Brownian dynamics simulations and a theoretical analysis based on the center-of-mass diffusion propagator. λ(hom) is decreasing with increasing shear rate in agreement with theoretical expectations and results from (2)H NMR lineshape analysis.}}, author = {{Åslund, Ingrid and Medronho, Bruno and Topgaard, Daniel and Söderman, Olle and Schmidt, Claudia}}, issn = {{1096-0856}}, language = {{eng}}, pages = {{291--299}}, publisher = {{Academic Press}}, series = {{Journal of Magnetic Resonance}}, title = {{Homogeneous length scale of shear-induced multilamellar vesicles studied by diffusion NMR.}}, url = {{http://dx.doi.org/10.1016/j.jmr.2011.01.024}}, doi = {{10.1016/j.jmr.2011.01.024}}, volume = {{209}}, year = {{2011}}, }