Abstract
Heterogeneity is an important property of porous media such as biological materials and rock samples. Spatially resolved NMR is a suitable method to extract heterogeneous information from porous materials. Here we measured spatially resolved pore-size (a) - relaxation (T2) correlation maps of porous materials. The experiments were implemented at low-field NMR to reduce the distortion of T2 measurements arising from internal gradients. The pore-size distributions were obtained by the method of Decay due to Diffusion in the Internal Field (DDIF). The relaxation information was acquired by the Carr-Purcell-Meiboom-Gill (CPMG) method. The frequency encoding method was applied to acquire spatially resolved information about porous samples. Two kinds of samples were measured: glass-bead model sample and sandstone samples with unknown structure. Localized information such as pore-size distributions and surface relaxivities were extracted from the spatially resolved a-T2 correlation maps. The heterogeneity of the samples was characterized at both microscopic (correlation maps) and macroscopic (MRI) scales. This method is expected to benefit many areas such as food industry and oil industry.
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