Vapor Adsorption and Displacement on Porous Glass by Surface Conductivity

Abstract

There is a marked increase in surface conductivity on adsorption of water vapor on porous glass. The relationship between the amount of adsorbed water vapor, the characteristic adsorption states of water molecules, and the surface conductivity for high surface area samples were obtained for nonmethylated and methylated conditions. Also the changes in conductivity with preadsorbed n-hexane on adsorption of water, methanol and acetone vapors were measured. Each of these replaces hexane as might be expected, but not all at equal rates. This effect is considered from the point of view of an interaction parameter for replacement.