화학공학소재연구정보센터
Langmuir, Vol.25, No.16, 9227-9231, 2009
Surface Area Measurements with Linear Adsorbates: An Experimental Comparison of Different Theoretical Approaches
The specific area of a substrate was determined from the results of adsorption isotherms performed wit It a sequence of four alkalies, from methane to butane, using three different approaches. The data were first analyzed using the BET equation and the point B methods: these results were compared with those obtained using a new equation designed for examining the case of multisite occupancy. The new model specifically accounts for sites that are left Uncovered in the case of adsorption by linear adsorbates. Of these three, only the last method gives essentially the same value for the specific surface area of the substrate when different adsorbates are used to measure it. The other two, more traditional. approaches give Values of the specific surface area that decrease as the length of the adsorbate used increases.