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    Unsaturated Fatty Acids in Alkane Solution: Adsorption to Steel Surfaces

    Year: 2007

    Journal: Langmuir 2007, 23, 10598-10602, 20100827

    Authors: Lundgren S.M. * † ‡, Persson K. †, Mueller G. §, Kronberg B. †, Clarke J. ^, Chtaib M. #, Claesson P.M † ‡

    Last authors: Per M. Claesson

    Organizations: YKI, Institute for Surface Chemistry, Box 5607, SE-114 86, Stockholm, Sweden, Department of Chemistry, Surface Chemistry, Royal Institute of Technology, Drottning Kristinas Va¨g 51, SE 100 44, Stockholm, Sweden, ThyssenKrupp Steel AG, Center of Materials Excellence, Surface Analysis, Kaiser-Wilhelm-Strasse 100, D-47166 Duisburg, Germany, Arizona Chemical B.V., European Technical Center, Transistorstraat 16, NL-1322 CE Almere, The Netherlands, and Laboratories of LUXCONTROL SA, 1 AVenue des Terres Rouges, L-4004-Esch, Alzette, Luxembourg

    Country: Luxembourg

    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.