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Planar lamellae and onions: a spatially resolved rheo-NMR approach to the shear-induced structural transformations in a surfactant model system

Medronho, Bruno LU ; Brown, Jennifer; Miguel, Maria Graca; Schmidt, Claudia; Olsson, Ulf LU and Galvosas, Petrik (2011) In Soft Matter 7(10). p.4938-4947
Abstract
The shear-induced transformations between oriented planar lamellae and a state of closely packed multilamellar vesicles (MLVs) in a lyotropic nonionic surfactant model system were studied by the combination of nuclear magnetic resonance (NMR) spectroscopy and diffusometry with magnetic resonance imaging (MRI). H-2 NMR imaging confirmed the discontinuous nature of the transition from onions to planar lamellae, revealing the spatial coexistence of both states within the gap of the cylindrical Couette geometry. On the other hand, NMR diffusion measurements in three principal directions and at various values of strain strongly suggest that a multi-lamellar cylindrical or undulated intermediate structure exists during the continuous and... (More)
The shear-induced transformations between oriented planar lamellae and a state of closely packed multilamellar vesicles (MLVs) in a lyotropic nonionic surfactant model system were studied by the combination of nuclear magnetic resonance (NMR) spectroscopy and diffusometry with magnetic resonance imaging (MRI). H-2 NMR imaging confirmed the discontinuous nature of the transition from onions to planar lamellae, revealing the spatial coexistence of both states within the gap of the cylindrical Couette geometry. On the other hand, NMR diffusion measurements in three principal directions and at various values of strain strongly suggest that a multi-lamellar cylindrical or undulated intermediate structure exists during the continuous and spatially homogeneous transition from planar lamellae to MLVs. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soft Matter
volume
7
issue
10
pages
4938 - 4947
publisher
Royal Society of Chemistry
external identifiers
  • wos:000290227400048
  • scopus:79955657950
ISSN
1744-6848
DOI
10.1039/c0sm01323d
language
English
LU publication?
yes
id
82f3f52d-e078-4d6c-9032-79c756c08588 (old id 1987086)
date added to LUP
2011-06-29 09:45:42
date last changed
2017-01-01 06:32:19
@article{82f3f52d-e078-4d6c-9032-79c756c08588,
  abstract     = {The shear-induced transformations between oriented planar lamellae and a state of closely packed multilamellar vesicles (MLVs) in a lyotropic nonionic surfactant model system were studied by the combination of nuclear magnetic resonance (NMR) spectroscopy and diffusometry with magnetic resonance imaging (MRI). H-2 NMR imaging confirmed the discontinuous nature of the transition from onions to planar lamellae, revealing the spatial coexistence of both states within the gap of the cylindrical Couette geometry. On the other hand, NMR diffusion measurements in three principal directions and at various values of strain strongly suggest that a multi-lamellar cylindrical or undulated intermediate structure exists during the continuous and spatially homogeneous transition from planar lamellae to MLVs.},
  author       = {Medronho, Bruno and Brown, Jennifer and Miguel, Maria Graca and Schmidt, Claudia and Olsson, Ulf and Galvosas, Petrik},
  issn         = {1744-6848},
  language     = {eng},
  number       = {10},
  pages        = {4938--4947},
  publisher    = {Royal Society of Chemistry},
  series       = {Soft Matter},
  title        = {Planar lamellae and onions: a spatially resolved rheo-NMR approach to the shear-induced structural transformations in a surfactant model system},
  url          = {http://dx.doi.org/10.1039/c0sm01323d},
  volume       = {7},
  year         = {2011},
}