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- W2078367413 abstract "Abstract Measurements of the room-temperature surface pressure-area ( π A) characteristics of dipalmitoyl lecithin (DPL) films reveal that the dynamic π-A compression curve differs markedly from the static compression curve. Since the dynamic compression behavior is essentially independent of cycling rate in the experimental range of 19.2–96A˚2/molecule/min, it appears that the DPL monolayer does not display appreciable viscous effects, although this may not be so over a wider cycling range. Nonetheless, for the experimental range studied, dynamic compression of DPL appears to impart a metastable structure to the surface which is distinct from the static molecular structure. When surface compression is halted at a given film area during a first compression, the DPL surface pressure is found to relax from its dynamic value towards the equilibrium value at the same film area. The relaxation time of this process was only 50 sec at the relatively large molecular area of 68A˚2/molecule, and it increased continuously to a value of 850 sec at an area of 40A˚2/molecule, just prior to film collapse. At all trough areas following film collapse, the surface pressure was exceedingly stable and relaxations of only a few dyn/cm were observed even after 12,000 sec. The data thus indicate that molecular crowding inhibits the relaxation process for DPL films. Moreover, the formation of multilayers during film collapse appears to impart an even greater stability to the film pressure." @default.
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- W2078367413 date "1977-06-01" @default.
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- W2078367413 title "Relaxation effects in the surface pressure behavior of dipalmitoyl lecithin" @default.
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- W2078367413 doi "https://doi.org/10.1016/0021-9797(77)90262-4" @default.
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