Abstract
Weak-kneed type II adsorption isotherms were obtained for n-heptane, n-octane, n-nonane, n-decane, and mesitylene on cellophane using the gas chromatographic peak maxima elution method. Monolayer capacities and molecular areas of the hydrocarbons were calculated from the isotherms using the BET method. The molecular areas were found to be larger on cellophane than on cellulose paper, suggesting a dependence on the strength of adsorption. From the temperature dependence of the n-nonane isotherms, the variation of the thermodynamic adsorption quantities with surface coverage was determined. The low net adsorption heats (<3.4 kJ mole−1) indicated that cellophane is a low-energy surface for hydrocarbons. Integration of the isotherms gave the spreading pressures of the hydrocarbons, from which the London force component of the cellophane surface free energy was estimated to be ∼46 mN m−1 and ∼42 mN m−1 using the geometric mean and arithmetic mean approximations, respectively.
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