title: Macroscopic phase separation, modulated phases, and microemulsions: a unified picture of rafts.
abstract: We simulate a simple phenomenological model describing phase behavior in a multicomponent membrane, a model capable of producing macroscopic phase separation, modulated phases, and microemulsions, all of which have been discussed in terms of raft phenomena. We show that one effect of thermal fluctuations on the mean-field phase diagram is that it permits a direct transition between either one of the coexisting liquid phases to a microemulsion. This implies that one system exhibiting phase separation can be related to a similar system exhibiting the heterogeneities characteristic of a microemulsion. The two systems could differ in their average membrane composition or in the relative compositions of their exoplasmic and cytoplasmic leaves. The model provides a unified description of these raft-associated phenomena.
authors.affiliation: Department of Physics, University of Washington, Seattle, Washington; Department of Chemistry, University of Washington, Seattle, Washington.
authors.forename: Roie
authors.initials: R
authors.lastname: Shlomovitz
authors.affiliation: Department of Chemistry, University of Washington, Seattle, Washington.
authors.forename: Lutz
authors.initials: L
authors.lastname: Maibaum
authors.affiliation: Department of Physics, University of Washington, Seattle, Washington. Electronic address: schick@phys.washington.edu.
authors.forename: M
authors.initials: M
authors.lastname: Schick
mesh_terms: D004655:Emulsions; D021962:Membrane Microdomains / Q000737:chemistry*; D008958:Models, Molecular; D013696:Temperature
chemical_list: D004655:Emulsions