title: Liquid-liquid immiscibility in lipid monolayers.
abstract: Some binary lipid mixtures form coexisting liquid phases when spread at the air/water interface. This work describes the pressure-composition phase diagrams of binary mixtures of four unsaturated phosphatidylcholines with dihydrocholesterol. These four binary mixtures have critical compositions of approximately fifty mole percent, and average critical exponents of 0.25 +/- 0.07. The data can also be approximated by a regular solution thermodynamic model, yielding parameters for the non-ideality of these mixtures.
authors.affiliation: Department of Chemistry, Stanford University, CA 94305-5080, USA.
authors.forename: J P
authors.initials: JP
authors.lastname: Hagen
authors.forename: H M
authors.initials: HM
authors.lastname: McConnell
mesh_terms: D004083:Cholestanol / Q000737:chemistry*; D008563:Membrane Lipids / Q000737:chemistry*; D010713:Phosphatidylcholines / Q000737:chemistry*; D011312:Pressure; D012995:Solubility; D013499:Surface Properties; D013816:Thermodynamics
chemical_list: D008563:Membrane Lipids; D010713:Phosphatidylcholines; D004083:Cholestanol