Bonding Properlies of LubricantsAll model lubricant species studied-water, perfluorodiethyl ether, perfluoropentane, perfluorooctane, trifluoroethanol, and peffluoroheptanol-reversibly adsorbed to the carbon surface and showed no signs of chemical reaction with the surface. However, the physisorption energies were observed to increase with increasing chain length of the molecule, incorporation of alcoholic endgroups, and increasing surface free energy of the carbon surface. Surface free
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