NMR DIFFUSION STUDIES IN HETEROGENEOUS SYSTEMS

Pulsed field gradient NMR is a powerful tool for the investigation of molecular diffusion. Being able to trace molecular displacements in the micrometer range over observation times of typically milliseconds to seconds, this technique is particularly suitable for the study of molecular propagation in heterogeneous systems. After an introduction to the fundamentals and limitations of the technique, its versatility is illustrated by recent examples of application to the study of molecular transport in interface systems and polymers.