Issue |
Europhys. Lett.
Volume 36, Number 2, October II 1996
|
|
---|---|---|
Page(s) | 117 - 122 | |
Section | Condensed matter: structure, thermal and mechanical properties | |
DOI | https://doi.org/10.1209/epl/i1996-00196-9 | |
Published online | 01 September 2002 |
The lamellar-to-isotropic transition in ternary amphiphilic systems
1
Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Kantstr. 55, 14513
Teltow, Germany
2
Sektion Physik der Ludwig-Maximilians-Universität München, Theresienstr. 37,
80333 München, Germany
Received:
21
June
1996
Accepted:
29
August
1996
We study the dependence of the phase behavior of ternary amphiphilic
systems on composition and temperature. Our analysis is based on a
curvature elastic model of the amphiphile film with sufficiently large
spontaneous curvature c0 and saddle-splay modulus
sufficiently negative that the stable phases are the lamellar phase
and a droplet microemulsion. In addition to the curvature energy, we
consider the contributions to the free energy of the long-ranged van
der Waals interaction and of the undulation modes. We find that for
bending rigidities of order
, the lamellar phase extends
further and further into the water apex of the phase diagram as the
phase inversion temperature is approached, in good agreement with
experimental results.
PACS: 64.70.Ja – Liquid-liquid transitions / 64.75.+g – Solubility, segregation, and mixing / 82.70.-y – Disperse systems
© EDP Sciences, 1996
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