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The water adsorption and voltage dependence of the surface conduction current at room temperature has been investigated at various relative humidities for quartz, Teflon and cellulose acetate. The results were analysed using the BET equation, so that the monolayer adsorption could be determined and the surface conductivity related to the number of water layers adsorbed. This showed that for Teflon, the surface of which has a weak attraction for water molecules, the conductivity increased exponentially with the number of sorbed layers of water. For quartz, for which the attraction is strong, the conductivity only commenced to increase exponentially after the completion of the first layer.
Awakuni et al. (Mon,) studied this question.
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