J. Phys. I France 2 (1992) 1741-1754
Flory theory of the unbinding transitionS. T. Milner1 and D. Roux2
1 Exxon Research and Engineering, Annandale, NJ 08801, U.S.A.
2 Centre de Recherche Paul Pascal, F-33405 Talence Cedex, France
(Received 22 January 1992, revised 1 June 1992, accepted 2 June 1992)
The transition between bound and unbound surfactant bilayers, controlled by the strength of attractive van der Waals interactions, is described in a simple Flory-type picture. All the main features of the transition previously described only by functional renormalization group methods are recovered, including 1) second-order nature of the transition; 2) estimate of the critical strength of van der Waals interactions; 3) dependence of tricritical point on bilayer stiffness. Our Flory picture also reproduces known exponents for unbinding and wetting transitions in d=2 dimensions.
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