Abstract
Measurements are described for studying the dynamical behavior of the surface pressure of monolayers, including the occurring hysteresis. The measurements concerned monolayers of dipalmitoyl lecithin (DPL), cholesterol, and mixtures of these components. The collapse mechanism of both pure components proved to differ pronouncedly; DPL collapse led to an irreversible loss of molecules, much larger than in the case of cholesterol monolayers. A quantitative correction for this loss of molecules made a description of the remaining hysteresis in thermodynamic terms possible.
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