| Issue |
Europhys. Lett.
Volume 43, Number 6, September II 1998
|
|
|---|---|---|
| Page(s) | 683 - 689 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00417-3 | |
| Published online | 01 September 2002 | |
Shear-induced orientations in a lyotropic defective lamellar phase
1
Albert-Ludwigs-Universität Freiburg i. Br., Institut für Makromolekulare Chemie, Stefan-Meier-Straße 31, D-79104 Freiburg, Germany
2
Institut Laue-Langevin, BP 156 - F-38042 Grenoble, France
Received:
9
February
1998
Accepted:
22
July
1998
The influence of shear on a defective lamellar phase of the
ternary mixture sodium dodecyl sulphate/decanol/
was studied using
small-angle neutron scattering (SANS), small-angle light scattering (SALS)
and birefringence. Shear flow leads to an alignment of lamellae but in addition
to previous studies, we found a reorientation from "perpendicular” lamellae,
i.e. with the layer normal along the vorticity direction, to "parallel” lamellae
with the layer normal along the velocity gradient direction at increasing
shear rates. The reorientation processes were accompanied by a decrease of
viscosity.
PACS: 61.30.Eb – Experimental determinations of smectic, nematic, cholesteric, and other structures / 83.20.Hn – Structural and phase changes / 83.50.-v – Deformation; material flow
© EDP Sciences, 1998
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