Abstract
A study of bilayer phase behavior is presented for the phospholipid mixture di12:0-PC/di16:0-PC, based on an analysis of equilibrium surface pressures which develop at the gas−water interface above suspensions of bilayer vesicles. At 22 ± 1 °C, the fluidus and solidus bilayer phase boundaries are determined to be 32 and 85 mol % di16:0-PC, respectively, consistent with literature values obtained through calorimetry. Evidence is presented which suggests that Teflon substrates are better suited than high-energy substrates for surface pressure measurements involving insoluble monolayers.
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