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Pathway of the shear-induced transition between planar lamellae and multilamellar vesicles as studied by time-resolved scattering techniques

Nettesheim, F; Zipfel, J; Olsson, Ulf LU ; Renth, F; Lindner, P and Richtering, W (2003) In Langmuir 19(9). p.3603-3618
Abstract
We report on the shear-induced transition from an oriented lamellar phase (L, phase) to multilamellar vesicles (MLV) in two nonionic surfactant systems, namely, a 40 wt % sample of triethylene glycol monodecyl ether (C10E3) and a 40 wt % sample of tetraethylene glycol monododecyl ether (C12E4) in D2O. This transition was studied by time-resolved small-angle neutron and light scattering under shear. Within a range of shear rates from 2 to 100 s(-1) at 25 degreesC the transition from the L-alpha, phase to MLVs in the C10E3 system apparently is controlled by strai

. This transition involves an intermediate structure with cylindrical scattering symmetry. This can be interpreted as multilamellar cylinders (MLCs) or as a coherent stripe... (More)
We report on the shear-induced transition from an oriented lamellar phase (L, phase) to multilamellar vesicles (MLV) in two nonionic surfactant systems, namely, a 40 wt % sample of triethylene glycol monodecyl ether (C10E3) and a 40 wt % sample of tetraethylene glycol monododecyl ether (C12E4) in D2O. This transition was studied by time-resolved small-angle neutron and light scattering under shear. Within a range of shear rates from 2 to 100 s(-1) at 25 degreesC the transition from the L-alpha, phase to MLVs in the C10E3 system apparently is controlled by strai

. This transition involves an intermediate structure with cylindrical scattering symmetry. This can be interpreted as multilamellar cylinders (MLCs) or as a coherent stripe buckling with the wave vector of the undulation in a neutral direction. The intermediate structures found along the transition path are stable for long times, when shear is turned off. This allows for studies on trapped intermediate structures and experiments where different positions within the gap of a couette shear cell were examined in so-called gap-scan experiments. These experiments revealed that the transition from planar lainellae to MLVs is homogeneous throughout the gap. A temperature increase to 32 degreesC changes neither the pathway nor the strain control in comparison with experiments run at 25 degreesC. Upon a further increase in temperature to 38 degreesC, the transition leads to a mixture of MLC and planar lamellae or a weakly buckled state. With C12E4 as surfactant, and therefore with changed bilayer properties, a strai

control is still observed, but less strain is needed for the transition compared to that of the C10E3 system. A comparison of the transition for the two systems, their transient as well as their steady-state viscosities, indicates that the transition is controlled by the stress. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
19
issue
9
pages
3603 - 3618
publisher
The American Chemical Society
external identifiers
  • wos:000182467100009
  • scopus:0037627550
ISSN
0743-7463
DOI
10.1021/la026654y
language
English
LU publication?
yes
id
97d1e12c-a7b0-4ea1-bec0-720e8ce2db23 (old id 122111)
date added to LUP
2007-07-12 08:19:37
date last changed
2017-08-27 03:51:14
@article{97d1e12c-a7b0-4ea1-bec0-720e8ce2db23,
  abstract     = {We report on the shear-induced transition from an oriented lamellar phase (L, phase) to multilamellar vesicles (MLV) in two nonionic surfactant systems, namely, a 40 wt % sample of triethylene glycol monodecyl ether (C10E3) and a 40 wt % sample of tetraethylene glycol monododecyl ether (C12E4) in D2O. This transition was studied by time-resolved small-angle neutron and light scattering under shear. Within a range of shear rates from 2 to 100 s(-1) at 25 degreesC the transition from the L-alpha, phase to MLVs in the C10E3 system apparently is controlled by strai<br/><br>
. This transition involves an intermediate structure with cylindrical scattering symmetry. This can be interpreted as multilamellar cylinders (MLCs) or as a coherent stripe buckling with the wave vector of the undulation in a neutral direction. The intermediate structures found along the transition path are stable for long times, when shear is turned off. This allows for studies on trapped intermediate structures and experiments where different positions within the gap of a couette shear cell were examined in so-called gap-scan experiments. These experiments revealed that the transition from planar lainellae to MLVs is homogeneous throughout the gap. A temperature increase to 32 degreesC changes neither the pathway nor the strain control in comparison with experiments run at 25 degreesC. Upon a further increase in temperature to 38 degreesC, the transition leads to a mixture of MLC and planar lamellae or a weakly buckled state. With C12E4 as surfactant, and therefore with changed bilayer properties, a strai<br/><br>
 control is still observed, but less strain is needed for the transition compared to that of the C10E3 system. A comparison of the transition for the two systems, their transient as well as their steady-state viscosities, indicates that the transition is controlled by the stress.},
  author       = {Nettesheim, F and Zipfel, J and Olsson, Ulf and Renth, F and Lindner, P and Richtering, W},
  issn         = {0743-7463},
  language     = {eng},
  number       = {9},
  pages        = {3603--3618},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Pathway of the shear-induced transition between planar lamellae and multilamellar vesicles as studied by time-resolved scattering techniques},
  url          = {http://dx.doi.org/10.1021/la026654y},
  volume       = {19},
  year         = {2003},
}