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- W2043928580 abstract "The influence of ethanol on single phospholipid monolayers at the water/air interface and in foam films has been investigated. Grazing incidence X-ray diffraction investigations (GIXD) of Langmuir monolayers from 1,2-distearoyl-phosphatidylcholine (DSPC) spread on water subphases with different amounts of ethanol were performed. The thickness and free specific energy of formation of foam films stabilized by 1,2-dimyristoyl-phosphatidylcholine (DMPC) at different concentrations of ethanol in the film forming dispersions were measured. The GIXD investigations show that the tilt angle of the alkyl chains in the PC lipid monolayer decreases with increasing concentration of ethanol caused by a decrease of the diameter of the head groups. With increasing ethanol content of the solution also the thickness of the aqueous core of PC lipid foam films decreases. We assume that ethanol causes a decreasing probability for the formation of hydrogen bonds of water molecules to the PC head groups. The distinct difference between the effects of ethanol on lipid bilayers as described in the literature and on monolayers and foam films found in this study is discussed. Whereas PC monolayers at the water/air interface become unstable above 25 vol.% ethanol, the PC foam films are stable up to 50 vol.% ethanol. This is related to the decrease of the surface excess energy per lipid molecule by the interaction between the two film surfaces." @default.
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- W2043928580 date "2001-04-01" @default.
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- W2043928580 title "X-ray diffraction and foam film investigations of PC head group interaction in water/ethanol mixtures" @default.
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- W2043928580 doi "https://doi.org/10.1016/s0009-3084(01)00135-9" @default.
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