Water proton relaxation studies of pore microstructure in monodisperse glass bead beds

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Abstract
The distribution of water proton transverse and longitudinal relaxation times observed in water-saturated, randomly packed beds of monodisperse glass beads is used to analyse the pore size distribution and pore connectivity in the beds. It is shown that, contrary to expectation, the pore size distribution is not continuous, but shows four discrete pore size categories associated with distorted octahedral, tetrahedral and triangular pores. The pulse spacing dependence of the transverse relaxation times associated with each of these pore sizes is used to determine the magnitude of the internal localized magnetic fields in the pores.