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
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