Volume 66, Number 6, June 2004
|Page(s)||888 - 894|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 June 2004|
Groupe de Dynamique des Phases Condensées (UMR CNRS-UM2 5581), CC26 Université Montpellier 2 - 34095 Montpellier Cedex 5, France
2 Centre de Recherche Paul Pascal - avenue Schweitzer, 33600 Pessac, France
3 Department of Physics and Astronomy & Polymer IRC, University of Leeds Leeds LS2 9JT, UK
4 School of Physics, University of Edinburgh, JCMB Kings Buildings Mayfield Road, Edinburgh EH9 3JZ, UK
Accepted: 15 April 2004
We demonstrate the possibility of a stable equilibrium multi-lamellar (“onion”) phase in pure lamellar systems (no excess solvent) due to a sufficiently negative Gaussian curvature modulus. The onion phase is stabilized by non-linear elastic moduli coupled to a polydisperse size distribution (Apollonian packing) to allow space-filling without appreciable elastic distortion. This model is compared to experiments on copolymer-decorated lamellar surfactant systems, with reasonable qualitative agreement.
PACS: 82.70.Uv – Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems (hydrophilic and hydrophobic interactions) / 68.18.Jk – Surface and interfaces; thin films and low-dimensional systems (structures and nonelectric properties): Phase transitions / 61.30.St – Lyotropic phases
© EDP Sciences, 2004
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