MAGNETIC HETEROGENEITY OF POROUS MATERIALS AND ITS MANIFESTATION IN NMR SPECTRA
A theoretical analysis of the capabilities of the NMR method for the study of the morphology of heterogeneous media was carried out. The relationship between the parameters of high-resolution NMR spectra and the integral parameters of medium heterogeneity is shown. The position of the NMR lines of the liquid phase of a substance localized in the spheroid cavities of two and three-component media was calculated. The difference in the magnetic susceptibilities of the components of the media affects the position of the lines through the mechanism of inhomogeneous broadening. The relationships between the position of the NMR lines of liquids, the diamagnetic susceptibilities of the components, the demagnetizing factors, and the volume fraction of dispersed particles have the form of linear equations. The degree of dispersion of the material does not directly affect the position of the NMR lines with the constancy of the spheroid shape of the inclusions. The results of theoretical consideration can be extended to more complex types of heterogeneous media with spheroid morphology pores.
Authors: Ya. Yu. Marchenko, B. P. Nikolaev
Keywords: Porous materials, heterogeneous media, NMR spectra, line form
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