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Order-Disorder Transition of Nonionic Onions under Shear Flow

Suganuma, Yukiko; Imai, Masayuki; Kato, Tadashi; Olsson, Ulf LU and Takahashi, Tsutomu (2010) In Langmuir 26(11). p.7988-7995
Abstract
We have investigated the shear-induced ordering of multilamellar vesicles (onions) in a nonionic surfactant (C12E4) system using a small-angle light scattering (shear-SALS) and a small-angle X-ray scattering (shear-SAXS) technique. In a narrow shear rate-temperature space, the onions form a two-dimensional (2D) hexagonally close-packed structure that shows characteristic hexagonal scattering patterns in both SALS and SAXS. In the dynamic phase diagram, the ordered onion phase is surrounded by disordered onion phase. indicating reentrant behavior against the temperature. The disorder-order transition is accompanied by a jump in onion size by a factor of 5-6. In the disordered onion phase, by applying a shear flow, the planar lamellar... (More)
We have investigated the shear-induced ordering of multilamellar vesicles (onions) in a nonionic surfactant (C12E4) system using a small-angle light scattering (shear-SALS) and a small-angle X-ray scattering (shear-SAXS) technique. In a narrow shear rate-temperature space, the onions form a two-dimensional (2D) hexagonally close-packed structure that shows characteristic hexagonal scattering patterns in both SALS and SAXS. In the dynamic phase diagram, the ordered onion phase is surrounded by disordered onion phase. indicating reentrant behavior against the temperature. The disorder-order transition is accompanied by a jump in onion size by a factor of 5-6. In the disordered onion phase, by applying a shear flow, the planar lamellar membranes transform to an intermediate structure. multilamellae cylinders or a coherent stripe buckling, and then the intermediate structure develops to the isotropic onions. On the other hand, in the ordered onion phase, the intermediate structure breaks to onions stretched in the shear velocity direction, and then the stretched onions aligned gradually to form the 2D hexagonal close packing. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
26
issue
11
pages
7988 - 7995
publisher
The American Chemical Society
external identifiers
  • wos:000277928100048
  • scopus:77954558284
ISSN
0743-7463
DOI
10.1021/la904862e
language
English
LU publication?
yes
id
43b928fd-8417-4649-adce-95d004bbb945 (old id 1616741)
date added to LUP
2010-06-22 14:42:41
date last changed
2018-05-29 10:38:38
@article{43b928fd-8417-4649-adce-95d004bbb945,
  abstract     = {We have investigated the shear-induced ordering of multilamellar vesicles (onions) in a nonionic surfactant (C12E4) system using a small-angle light scattering (shear-SALS) and a small-angle X-ray scattering (shear-SAXS) technique. In a narrow shear rate-temperature space, the onions form a two-dimensional (2D) hexagonally close-packed structure that shows characteristic hexagonal scattering patterns in both SALS and SAXS. In the dynamic phase diagram, the ordered onion phase is surrounded by disordered onion phase. indicating reentrant behavior against the temperature. The disorder-order transition is accompanied by a jump in onion size by a factor of 5-6. In the disordered onion phase, by applying a shear flow, the planar lamellar membranes transform to an intermediate structure. multilamellae cylinders or a coherent stripe buckling, and then the intermediate structure develops to the isotropic onions. On the other hand, in the ordered onion phase, the intermediate structure breaks to onions stretched in the shear velocity direction, and then the stretched onions aligned gradually to form the 2D hexagonal close packing.},
  author       = {Suganuma, Yukiko and Imai, Masayuki and Kato, Tadashi and Olsson, Ulf and Takahashi, Tsutomu},
  issn         = {0743-7463},
  language     = {eng},
  number       = {11},
  pages        = {7988--7995},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Order-Disorder Transition of Nonionic Onions under Shear Flow},
  url          = {http://dx.doi.org/10.1021/la904862e},
  volume       = {26},
  year         = {2010},
}