THE TEMPERATURE EFFECT ON THE ADAMANTANE DERIVATIVE ADSORPTION BEHAVIOR

The adsorption behavior of two adamantane derivatives was studied by t he differential capacitance technique. The derivatives, namely, 1-oxym ethyladamantane (1-OMAd) and 1-adamantylmethylketone (1-AdMK), contain one- or two-carbon substituents in a side chain of the cage-like mole cule. The temperature effect on the formation of the different-structu re condensed layer was observed for the first time. An example was 1-A dMK. Quantitative analysis proved that 1-OMAd adsorption can be adequa tely described by the Ising model over a broad temperature range. The side chain in the cage-like molecule was shown to be detrimental to th e condensed layer formation because it reduced the attraction constant , as well as the adsorption layer temperature stability. The condensed layer molecule interaction energy generally increases, and so too doe s the destructive effect of the thermal treatment when the surfactant spherical molecule symmetry increases.