Abstract
Monolayer properties of interfacially active fractions in six different North Sea crude oils have been studied. The fractions were separated by a consecutive adsorption procedure utilizing functionalized silica as adsorbent. The molecular weight of the fractions are between 950 and 1450 g mol −. They are built up of carbon and hydrogen to 99 mol% and of nitrogen, oxygen and sulfur to 1 mol%. The fractions form monomolecular films in the air/water interface. The films enter the highly compressible liquid expanded state at specific areas in the range of 0.20–0.28 m 2mg −1. Film fracturing occurs at surface pressures between 10 and 20 mN m −1. The influence of electrolytes, pH, temperature and chemical additives is reported. It is shown that aromatic solvents strongly interact with the film hence modifying its monolayer properties. Relaxation studies of the compressed monolayers display a behaviour characteristic of rearrangements in coiled polymeric monolayers with partly water-soluble groups. Correlation between the monolayer properties of these fractions and their ability to stabilize water-in-crude oil emulsions is undertaken.
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