Studies on the Surface Structure of Porous Materials

1. The adsorption characteristics of ths sugar carbon prepared by carbonization or activation and silica gel were studied in detail by the adsorption of water, benzene and fatty acid vapors, and mercury porosimetry. The pore distribution of the active carbon was tri-disperse. The effects of the partial filling of the pores were examined. The missing link in the distribution curve between the micro-pore and transitional pore in the previous reports was replenished. 2. The narrow-neck or ink-bottle structure of the pores of sugar carbon complicated the adsorption characteristics. The pores of the silica gel were cylindrical with a uniform section. 3. In order to specify the physical selective adsorption, the new term “ sieving coefficient” was defined from the relation between the pore radii and cross sections of the adsorbates.