L. Golubovic, PASSAGES AND DROPLETS IN LAMELLAR FLUID MEMBRANE PHASES, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 50(4), 1994, pp. 180002419-180002422
We consider thermally excited passages and droplets formed between flu
id membranes in a lamellar phase. We show that they induce entropic at
tractive interactions which compete with Helfrich's entropic intermemb
rane repulsion. This competition determines the intermembrane distance
l(max) lamellar phases reach at transitions to isotropic fluid membra
ne phases. In general, l(max) is much smaller than the membrane persis
tence length and crucially depends on membrane saddle-splay (''Gaussia
n'') rigidity.