A MAGNETIC CHARACTERIZATION OF THE TEXTURE OF SIMPLE POROUS-MEDIA

A novel, magnetic way of characterizing the geometric structure of the voids in macroporous material is presented. A system of methane gas c onfined interstitially in a close-packed assembly of non-absorbent zir conia beads constitutes a two-phase model (pore and matrix) of simple porous media. Nuclear magnetic resonance measurements of the proton sp ectral linewidth and spin echo decay are reported. They are compared w ith a theoretical model of the intrinsic, non-uniform, magnetic field and its gradient, which are due to the heterogeneous magnetic suscepti bility. Three magnetic parameters are derived, which indirectly charac terize the pore geometry and which adequately describe the system over seven-ford ranges of gas pressure and bead size.