| Issue |
Europhys. Lett.
Volume 51, Number 3, August I 2000
|
|
|---|---|---|
| Page(s) | 320 - 326 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00355-6 | |
| Published online | 01 September 2002 | |
Scaling of the elastic modulus of highly swollen hexagonal phases
Groupe de Dynamique des Phases Condensées (UMR
5581, CNRS-Université Montpellier 2) CC26, Université
Montpellier 2 - 34095 Montpellier Cedex 5, France
Received:
17
January
2000
Accepted:
22
May
2000
We investigate the elastic behavior of highly swollen hexagonal
phases. These systems consist of oil cylinders of radius R up to
17 nm, coated with a surfactant monolayer and closely packed on
a triangular lattice in water. We perform creep tests experiments:
upon application of a small stress, polycrystalline samples
exhibit a response typical of viscoelastic materials. The
instantaneous elastic strain allows us to determine the
macroscopic shear modulus G0 of hexagonal phase. In the high
swelling limit, we find that 
. We present a
simple model, based on the deformation of the cylinders, which
leads to the scaling , in very good agreement
with the experimental results.
PACS: 62.20.Dc – Elasticity, elastic constants / 68.10.-m – Fluid surfaces and fluid-fluid interfaces / 61.30.-v – Liquid crystals
© EDP Sciences, 2000
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