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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Charged Soft Matter, Polyelectrolytes and Ionic Liquids

CPP 13.1: Hauptvortrag

Montag, 9. März 2026, 15:00–15:30, ZEU/0260

Glassy dynamics and charge transport in (polymeric) ionic liquids — •Friedrich Kremer — University of Leipzig, Germany

Glassy dynamics and charge transport in a variety of bulk glass-forming ionic liquids (ILs) are investigated using a combination of Broadband Dielectric Spectroscopy (BDS), Pulsed Field Gradient Nuclear Magnetic Resonance (PFG NMR), Differential Scanning Calorimetry and Rheology. While the absolute values of the dc conductivity as well as viscosity vary over more than 11 decades with temperature and upon systematic structural variation of the ILs, quantitative agreement is found between the characteristic diffusion rates and the mechanically measured structural α-relaxation. Based on Einstein, Einstein-Smoluchowski, Maxwell and Langevin relations, the link between rotational and translational diffusion in ILs is experimentally verified and universal scaling of charge transport in ionic liquids is traced back to the dominant role of Brownian dynamics. A further analysis of the dielectric spectra enables one to deduce – using the Einstein-Smoluchowski equation – diffusion coefficients in quantitative agreement with independent PFG NMR results, but in an extraordinarily broad range spanning over 13 decades.

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