The main input parameters for the MTT model are the adsorption energy, the hard-disk area, and the number of orientationally-free carbon atoms n c in the tail. The value of the harddisk area for each OFM is taken as A hp from Table . The adsorption energy is calculated for each OFM using equation 3 and the PMF, with the solvent volume v s for PAO4 being 0.8525 nm 3 and 0.488 nm 3 for Hexadecane. For SA the adsorption energy was calculated using z 0 = 0.18 nm, z 1 = 0.365 nm and z 2 = 1.8 nm for PAO4 and yielded ∆µ 0 sa = -27.8