Enthalpies of immersion of bare and precovered graphon in a homologous series of n-alkanes

Abstract

A rapid rise in the enthalpy of immersion (298 K) of Graphon in liquid n-alkanes is interpreted as arising from increasing cooperative structuring of the adjacent liquid, induced by the solid surface, in a manner reminiscent of solidification. For longer chain lengths the process may be aided by a good lattice fit of the alkane chain on the hexagonal graphitic basal planes. For both n-hexane and n-octane good agreement was found between measured enthalpies of immersion at various precoverages and those predicted from the isosteric enthalpies of adsorption.