Abstract
Adsorption isotherms of benzene and toluene vapors on mica and aluminum foil samples, whose apparent surface areas were known geometrically, were measured at 30 to 40°C by gravimetry, in order to inspect the relation of the surface area of the samples to the gradient at the linear portion or at the inflexion of the Type II (or Type III) adsorption isotherms to be obtained. The surface areas of the mica and aluminum foil samples having respective geometrical surface areas of 500 and 790 cm 2 were estimated as slightly larger values by about +9 and +7% from the values of the linear portion gradient of the adsorption isotherms obtained (adsorption isotherm gradient method). However, the BET surface area of the aluminum sample by the nitrogen adsorption was 12% larger than the geometrical one. It was shown in this study that the adsorption isotherm gradient method using the benzene or toluene vapor at room temperature may be useful as well as the standard BET method for the estimation of the surface area.
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