https://doi.org/10.1140/epje/i2009-10450-6
Regular Article
Aging and yielding in a sheared AOT/iso-octane/water lyotropic lamellar phase
1
Laboratoire de Rhéologie UMR 5520, Domaine Universitaire, BP53, 38041, Grenoble Cedex 9, France
2
CERMAV UPR 5301, Domaine Universitaire, BP53, 38041, Grenoble Cedex 9, France
3
Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Victoria, Australia
4
Laboratoire de Spectrométrie Physique UMR 5588, 140 Av. de la Physique, BP87, 38042, st Martin d’Hères, France
* e-mail: yann.auffret@ujf-grenoble.fr
** e-mail: denis.roux@ujf-grenoble.fr
Received:
6
June
2008
Revised:
23
January
2009
Accepted:
6
March
2009
Published online:
3
May
2009
We define a creep-flow-based measurement procedure to allow reliable and reproducible results on aging and yielding materials to be obtained. Investigation of the effects of different parameter such as the pre-shear time, the recovery time and the applied stress magnitude on the viscoelastic properties of a lyotropic liquid crystal phase is reported. Cryo-TEM observations indicate the formation of multiconnected bilayers at rest. Shearing the investigated material shows a propensity to acquire all the macroscopic properties of “soft jammed systems”. These properties are then interpreted in terms of shear-induced structural rearrangement on the basis of cryofracture observation obtained at different times after the preshear imposed.
PACS: 83.60.-a Material behavior – / 61.30.St Lyotropic phases –
© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg, 2009