THE IONIC AND MOLECULAR TRANSPORT IN POLYMERIC AND BIOLOGICAL MEMBRANES ON MAGNETIC RESONANCE DATA

Abstract

Ionic and molecular transport mechanism in nanostructure systems could be understood on the basis of interconnection transport channel structure; ionic and molecular state; and translational mobility in different spatial scales. This information may be obtained from magnetic resonance data. We have investigated ion-exchange polymeric membranes and biological membranes. The ion exchange membranes contain acid or basic (charged) groups, which together with mobile ions and water molecules organize the network of transport channels. The well-known ion-exchange system, which has a regular structure, is the perfluorinated ion-exchange membrane Nafion, produced by Dupont Company. We investigated Russian perfluorinated sulfonated exchange membrane MF-HSK, which is similar to Nafion. This membrane contain a main polymeric perfluorinated chain with side ethereal fragment containing the sulfate groups, which can exchange their positive charge counter ions. It may be H + ion or alkaline ions or other metals [1,2]. The structure of the polymeric chains and the structure of the transport channels are shown in Fig. l. According to numerous investigations including referent porometry, X-ray scattering data, Mossbauer spectroscopy, EPR, ENDOR, NMR-relaxation and PFG NMR data, the structure of transport channels is understood. The volume of transport channels is about 1/4 of the polymeric volume. The transport