Abstract
Surface dipole density differences, μ, between coexisting liquid phases in lipid monolayers have been determined from an analysis of the Brownian motion of trapped lipid domains, as well as from surface potential measurements on each liquid phase. The coexisting liquid phases arise in binary mixtures of dimyristoylphosphatidylcholine (DMPC) with cholesterol or with dihydrocholesterol. Values of μ determined from Brownian motion, surface potential measurements, and measurements of domain electrophoretic mobility provide support for the theoretical equivalent dipole model used previously to describe these monolayers. Air oxidation and ozonolysis of cholesterol in monolayers is detected through the effect of an oxidation product-mediated reduction of interdomain line tension
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