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Unsaturated fatty acids in alkane solutions: Adsorption to steel surfaces
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
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2007 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 23, 10598-10602 p.Article in journal (Refereed)
Abstract [en]

The adsorption of the unsaturated fatty acids oleic, linoleic, and linolenic acid on steel surfaces has been investigated by means of a quartz crystal microbalance (QCM). Two different solvents were used, n-hexadecane and its highly branched isomer, viz., 2,2,4,4,6,8,8-heptamethylnonane. The area occupied per molecule of oleic acid at 1 wt % corresponds to what is needed for adsorption parallel to the surface. At the same concentration, the adsorbed amount of linoleic acid and linolenic acid indicates that they adsorb in multilayers. The chemisorbed amount estimated from static secondary ion mass spectroscopy (SIMS) measurements was found to be similar for the three unsaturated fatty acids. In the case of linolenic acid, it was found that the presence of water significantly alters the adsorption, most likely because of the precipitation of fatty acid/water aggregates. Furthermore, static SIMS results indicate that the amount of water used here inhibits the chemisorption of linolenic acid.

Place, publisher, year, edition, pages
2007. Vol. 23, 10598-10602 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27149OAI: oai:DiVA.org:ri-27149DiVA: diva2:1054153
Note
A1903Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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