Abstract
Desorption is one of the mechanisms of lubricant loss from the surfaces of data storage media. This work has studied the desorption of monodisperse samples of a typical perfluoropolyalkyl ether lubricant, Fomblin Zdol, from the surface of graphite. Desorption is observed to occur molecularly through a first-order process with an energy barrier to desorption, Δ , that is independent of coverage but is dependent on molecular weight. The Δ of 994 and 1329 g/mole fractions were found to be 128 ± 2 kJ/mol and 155 ± 2 kJ/mol, respectively. The pre-exponents, v, of the first-order desorption rate constant were found to have values of 1019.6±0.3 s-1 and 1021.1±0.3 s-1 for the 994 and 1329 g/mole Zdol fractions, respectively. These results clearly reveal the chain length dependence of the Δ , and the high values of the pre-exponents are similar to those observed for desorption of other oligomeric species from graphite.
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