Bulk Hemolymph A Solution of Surfactants

Surface properties relate to each other as well as to the bulk properties of the hemolymph. Surfactants form an adsorbed mono-layer. We might imagine molecules as parking themselves within this adsorbed monolayer. This model works well for non-ionic surfactants. If the surfactant within the volume of hemolymph is dilute, surfactant in the monolayer per unit area coincides with the adsorption of surfactant. We may define the idea of limited parking areas that limit adsorptive capacity as being the mono-layer capacity.

The monolayer of surfactant exerts a two-dimensional pressure over the surfaces. Films are fluids spread more thickly than as monolayers, in that a film contains a bulk layer interposed between its two surfaces. In accord with the Gibbs theory of capillarity, we can describe film like interfaces if we replace surface tension with film tension.

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