The study of water diffusion in the lamellar phase of water-ammonium perfluorononanoate mixtures

The diffusion of water in the lamellar phase of water-ammonium perfluorononanoate mixtures has been measured with the help of an NMR-based method, which is an analog of the tracer method. Comparison of the data obtained with the results of a pulse field gradient nuclear magnetic resonance study has been conducted in terms of the structure of lyotropic liquid crystal. The difference in the water diffusion coefficients obtained by different techniques has been attributed to the non-linear time dependence of the mean-square displacement of a molecule in an inhomogeneous system.