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- W2023283947 abstract "1. The surface presure area curves of l-α-dipalmitoyl lecithin at the air—water interface were determined at 25°, 35° and 45°; the analysis of the curves and the thermodynamic parameters of the compression process suggest the existence of a phase transition in the monolayer, which could be explained through the action of Van der Waals forces acting between the methylene groups of the hydrocarbon chains of neighbour molecules. 2. The surface potential-area curves, as well as the magnitude of the surface dipole moment per molecule and its temperature dependence, are in accord with the molecular models previously suggested for lecithin monolayers with the positive and negative charges coplanar, in a plane parallel to the interface. 3. Surface viscosity and its temperature dependence were determined with a floating canal viscometer at 25° and 35°. The change in the slope of the plot of the logarithm of surface viscosity against surface pressure suggests the existense of different flow units below and above 12 dyne·cm−1. The energy, and the free energy of viscous flow calculated for the interval 14 – 30 dyne·cm−1 are lower than tese calculated fot the interval 1 to 12 dyne·cm−1; the entropy of viscous flow at lower surface pressures is less negative than that corresponding to the interval 14–30 dyne·cm−1, in accord with the suggestion of two different flow units. 4. The equilibrium spreading surface pressure shows a peculiar behaviour. No spreading occurs below 40°; at 45° spreading occurs attaining the equilibrium value after 2 h." @default.
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- W2023283947 date "1968-11-01" @default.
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- W2023283947 title "Surface chemistry of l-α-dipalmitoyl lecithin at the air-water interface" @default.
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- W2023283947 doi "https://doi.org/10.1016/0005-2736(68)90114-4" @default.
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