The adsorption of vapours on mercury. I. Non-polar substances

Abstract
Reversible results for the adsorption of benzene, toluene andn-heptane vapours on mercury have been obtained. The films were found to be gaseous and obeyed the Volmer equtionF(A-b) =kT, whereF= spreading pressure,A=area per molecule andb= co-area. The possibility that the films might be immobile was considered and the Langmuir equation was applied but found unsatisfactory. A standard state for the surface phase was defined and the free energy, total energy and entropy of adsorption evaluated. The heat of adsorption was shown to increase with the amount on the surface. A number of phase changes were found to occur after the completion of monolayer adsorp­tion, the most striking being interpreted as the change over from ‘flat’ to ‘vertical’ adsorp­tion of the toluene molecules. Others were thought to be either two-dimensional condensation or adsorption of a second layer.

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