Dynamic interfacial properties of marine microlayers

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Abstract

Samples of fulvic acids, extracted from the Tyrrhenian Sea (Leghorn, Italy), are studied by dynamic surface tension and surface shear rheology measurements. The initial adsorption process follows a diffusion-controlled mechanism, while at longer times it is several orders of magnitude slower than expected from diffusion.

The fulvic acids form adsorption layers which exhibit viscoelastic behaviour. Some samples show a continuous increase in shear viscosity and elasticity until the value exceeds the limits of the shear rheometer. For other samples, an increase in these values was only observed during the first hour, after which the values levelled off.

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