SANS INVESTIGATIONS OF BENZENE ADSORPTION ON POROUS SILICA-GEL

The mechanisms of the adsorption and condensation of benzene in a meso porous silica gel at 310K have been investigated by SANS. Measurements have been made in situ during an adsorption/desorption isotherm cycle with a specially constructed cell using contrast matching conditions for the condensed fluid. The results are in accordance with a process of multilayer formation and subsequent capillary condensation, which d evelops around the zones of particle contact in the gel structure. (C) 1998 Elsevier Science B.V. All rights reserved.