Diamagnetic properties of adsorbed gases
Whitehurst, Harry Bernard
Doctor of Philosophy
For many years, the adsorption of gases and vapors by solids has been studied mainly by measuring the amount of adsorption as variant of pressure and temperature. Several theories of adsorption have been advanced, and equations derived to fit existing data with varying degrees of accuracy. Postulation of a mechanism to explain the processes of adsorption has been hampered by the lack of evidence regarding the physical properties of the adsorbed phase. Experiments to directly determine densities, indices of refraction, and similar properties of the adsorbed phase have not been devised. Recently, however, measurements of the dielectric constants and magnetic susceptibilities of sorbate-sorbent systems have been reported. Since both dielectric constants and magnetic susceptibilities are properties which may vary with physical and chemical changes, some insight into the problems of adsorption may be gained by appropriate measurement of these quantities. It is the purpose of this thesis to report the results of an investigation of the diamagnetic susceptibilities of several vapors adsorbed on silica gel.