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Relaxation of shear-aligned wormlike micelles

Angelico, R; Olsson, Ulf LU ; Mortensen, K; Ambrosone, L; Palazzo, G and Ceglie, A (2002) In The Journal of Physical Chemistry Part B 106(10). p.2426-2428
Abstract
We report on the first time-resolved small-angle neutron scattering (SANS) study of the structural relaxation from a shear-induced aligned state back to the isotropic state in a system of giant wormlike reverse micelles. The micelles are formed by lecithin and small amounts of water in cyclohexane. A liquid sample with the micellar volume fraction phi = 0.3 was exposed to a steady shear of (gamma) over dot = 10 s(-1) in a Couette shear cell. This was sufficient to transform the whole sample into an aligned state with the polymer-like micelles preferentially oriented parallel to the velocity direction. After cessation of shear, the sample relaxes back to the equilibrium liquid phase. By time-resolved SANS we could follow the relaxation... (More)
We report on the first time-resolved small-angle neutron scattering (SANS) study of the structural relaxation from a shear-induced aligned state back to the isotropic state in a system of giant wormlike reverse micelles. The micelles are formed by lecithin and small amounts of water in cyclohexane. A liquid sample with the micellar volume fraction phi = 0.3 was exposed to a steady shear of (gamma) over dot = 10 s(-1) in a Couette shear cell. This was sufficient to transform the whole sample into an aligned state with the polymer-like micelles preferentially oriented parallel to the velocity direction. After cessation of shear, the sample relaxes back to the equilibrium liquid phase. By time-resolved SANS we could follow the relaxation process, which is characterized by a continuous decrease of the order parameter. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
106
issue
10
pages
2426 - 2428
publisher
The American Chemical Society
external identifiers
  • wos:000174369400002
  • scopus:0037076114
ISSN
1520-5207
DOI
10.1021/jp013934y
language
English
LU publication?
yes
id
c4a729bd-78a1-4aac-b2e9-60bc881e5f36 (old id 342009)
date added to LUP
2007-08-07 15:17:29
date last changed
2017-04-23 04:27:44
@article{c4a729bd-78a1-4aac-b2e9-60bc881e5f36,
  abstract     = {We report on the first time-resolved small-angle neutron scattering (SANS) study of the structural relaxation from a shear-induced aligned state back to the isotropic state in a system of giant wormlike reverse micelles. The micelles are formed by lecithin and small amounts of water in cyclohexane. A liquid sample with the micellar volume fraction phi = 0.3 was exposed to a steady shear of (gamma) over dot = 10 s(-1) in a Couette shear cell. This was sufficient to transform the whole sample into an aligned state with the polymer-like micelles preferentially oriented parallel to the velocity direction. After cessation of shear, the sample relaxes back to the equilibrium liquid phase. By time-resolved SANS we could follow the relaxation process, which is characterized by a continuous decrease of the order parameter.},
  author       = {Angelico, R and Olsson, Ulf and Mortensen, K and Ambrosone, L and Palazzo, G and Ceglie, A},
  issn         = {1520-5207},
  language     = {eng},
  number       = {10},
  pages        = {2426--2428},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Relaxation of shear-aligned wormlike micelles},
  url          = {http://dx.doi.org/10.1021/jp013934y},
  volume       = {106},
  year         = {2002},
}