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 x 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 angstrom for MO The thicknesses indicate that the SBO adsorbed nearly perpendicular to the surface where MO molecules adsorbed nearly parallel to the surface Published by Elsevier B V