Abstract
Applying the modified elution gas chromatography method for determination of adsorption isotherms, the adsorption isotherms of n-octane and n-propanol on a bare graphite surface as well as on that precovered with n-hexadecane were determined. From these isotherms the extrapolated film pressure π max values were calculated from the integrated Gibbs′ adsorption equation, integrating up to saturated vapour pressure. Equating the π max values of n-octane to the work of wetting, the dispersion free surface energy of graphite was calculated, as a function of surface coverage with n-hexadecane. The obtained values were then discussed in relation to possible structures of hydrocarbon layers. The spreading films of n-octane seemed the most probable in the investigated systems. The dispersion free surface energy of bare graphite was estimated to be 119.5 mJ/m 2, which was comparable to the values reported in the literature. The deposited n-hexadecane layers seemed to reduce the surface energy of graphite to 68–70 mJ/m 2. Polar interactions of the bare graphite surface were also found.
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