Abstract
The adsorption behavior of soybean oil (SBO) and methyl oleate (MO) from hexadecane solvent onto a steel surface at room temperature was investigated using quartz crystal microbalance with dissipation (QCM-D). Adsorption of both SBO and MO in hexadecane increased with increasing concentration until a full surface coverage was attained. At full surface coverage, SBO and MO formed rigid films and achieved a concentration of 1.5 and 1.7 × 10 −10 mol/cm 2, respectively. Analysis of the QCM-D data determined that each formed a thin, rigid film where the thicknesses were approximately 1.5 nm for SBO and 7 Å for MO. The thicknesses indicate that the SBO adsorbed nearly perpendicular to the surface where MO molecules adsorbed nearly parallel to the surface.
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