J. Phys. II France
Volume 3, Numéro 8, August 1993
Page(s) 1255 - 1270
DOI: 10.1051/jp2:1993196
J. Phys. II France 3 (1993) 1255-1270

Dilute and concentrated phases of vesicles at thermal equilibrium

P. Hervé1, D. Roux1, A.-M. Bellocq1, F. Nallet1 and T. Gulik-Krzywicki2

1  Centre de recherche Paul-Pascal, CNRS, avenue du Docteur-Schweitzer, 33600 Pessac, France
2  Centre de génétique moléculaire, CNRS, 91190 Gif-sur-Yvette, France

(Received 15 March 1993, accepted in final form 7 May 1993)

A quaternary system made of an ionic surfactant (SDS), octanol, water and sodium chloride has been investigated. We present experimental results that demonstrate the existence of a phase of vesicles at thermal equilibrium. We show that vesicles can be prepared both in a dilute regime leading to an isotropic liquid phase of low viscosity and in a concentrated regime leading to a phase of close packed vesicles (probably multilayered) exhibiting high viscosity and viscoelasticity.

82.70 - 61.25

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