Compacts of powdered material as porous bodies for use in sorption studies

Abstract

Abstract Details are given for the production of rigid porous bodies (compacts) made by compacting under high pressure fine powders in the particle range of 10—0·01μ of silica, calcium carbonate, plaster of Paris and molecular sieves. These compacts were used as samples to study sorption and related dimensional changes. The results were used to compute spreading pressure by applying the Gibbs adsorption equation and allowed derivation of the Δ l/l vs φ plots using the Bangham relation. With compacts made from molecular sieves, it was possible to study the forces imposed on the particles by water entering or leaving the micropore system.