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Functional self- assembled polymer systems : Dynamics of ions, drugs and additives

Prof. Monika Schönhoff University of Münster, Germany

Polyelectrolytes can form interesting structures on the nano- and micro-scale by self-assembly, such as ultrathin films or defined colloidal particles. This lecture describes studies of the dynamics and transport properties of small molecular species in such structures by dynamic NMR methods, such as Pulsed Field Gradient NMR diffusion experiments. The systems investigated are relevant in different areas of application. One example is the development of colloidal carriers in drug delivery : We study the localization of active molecules or model compounds in particle dispersions, and their permeation through a polymeric wall of hollow particles. On the other hand, the transport of ions in polymeric materials is of interest for the development of advanced ion conductors as separators in batteries. The comparison of the diffusivities of different ionic species and the overall conductivity provides information about the mechanisms of charge transport in salt-in-polymer electrolytes. Furthermore, polyelectrolyte multilayers are studied as a new approach in this context, concerning their ion transport properties.