Abstract
The dispersion and non-dispersion components of the surface free energy of thermally treated and rehydroxylated controlled porosity glasses are calculated from the adsorption isotherms of n-octane and toluene. Depending on the applied rehydroxylation procedure, materials of different non-dispersive surface interactions may be prepared. It is stated that the presence of both boron and sodium on the surface of CPG affect the changes in the non-dispersion component, which result from rehydroxylation. The changes in the dispersion component are small. The derivative of the film pressure with respect to the adsorbed amount (χ II/χ a) appears very useful in the interpretation of the results.
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