Adsorption and Desorption

Adsorption not only refers to attachment but to bulk transfer of a substance from the bulk of the hemolymph onto the surface. To create an adsorbed monolayer, molecules of surfactant may move from the bulk of the hemolymph to the surface, or the surface, as in the lung, may produce a surfactant locally. Molecules then enter the monolayer to pack or park themselves and orient themselves. The first stage is diffusion; the second stage is 'pure adsorption.' Relative roles of these two stages may differ for different surfactants and molecules, thus determining the mechanism of adsorption and perhaps in cases of the thinnest surfaces, the stiffness of the surface as a whole.

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