J. Phys. II France
Volume 4, Numéro 2, February 1994
Page(s) 349 - 365
DOI: 10.1051/jp2:1994133
J. Phys. II France 4 (1994) 349-365

L 3 (sponge) phase in the very dilute regime : spontaneous tearing of the membrane ?

M. Filali1, G. Porte1, J. Appell1 and P. Pfeuty2

1  Groupe de Dynamique des Phases Condensées UA 233 CNRS, Université Montpellier II, 34095 Montpellier Cedex 05, France
2  Laboratoire de Physique des Solides UA CNRS, Bât. 510, Université Paris Sud, 91405 Orsay Cedex, France

(Received 15 July 1992, revised 15 October 1993, accepted 9 November 1993)

We use light scattering and conductimetry to investigate the very dilute range of the domain of existence of the sponge (L 3) phase in the quaternary OBS/pentanol/brine system. In this part of the phase diagram we find a line of maximum turbidity where the scattered intensity shows a very sharp maximum and has a pure Ornstein Zernicke q-dependence. These features are not consistent with what is expected close to the symmetric asymmetric transition line. We question the possibility of the spontaneous tearing of the membrane first considered on theoretical grounds by Huse and Leibler ( PhysRevLett. 66 (1991) 437).

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