THE FEATURES OF PFG NMR TECHNIQUE AND SOME METHODICAL ASPECTS OF ITS APPLICATION

摘要

Translational mobility of molecules under thermodynamic equilibrium conditions (self-diffusion) is a very important characteristic of the physicochemical state of molecular systems. In view of the rapid development of experimental methods for studying molecular dynamics, such as neutron scattering, Rayleigh light scattering, and nuclear magnetic resonance (NMR), studies of diffusion in complex systems acquire special interest. Such systems include solutions and melts of polymers, systems with chemical interactions, heterogeneous (e.g., porous) media, and membranes. Recently, the pulsed field gradient NMR (PFG NMR), which was proposed by Tanner and Stejskal in 1965, is widely applied for the investigation of transport properties of liquids in various media. Since 1974, the field of our scientific interests connects directly to the development of PFG NMR and its applications for the investigation translational mobility in the complicated molecular systems: polymeric solutions and melts, polymeric networks, biological systems, porous media. Size limitations of this paper prevent us from giving a detailed description of all available data on applying this method.