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Broadband Dielectric Spectroscopy (BDS) [1], as one of the major tools in molecular physics, benefits from several advantages; (i) based on one of Maxwell´s equations it measures both, charge transport of mobile charge carriers and relaxations of the polar moieties in a molecular system, (ii) it covers an extraordinary wide spectral range from typically 10-5Hz – 109Hz or higher, (iii) with modern equipment the experiments can be carried out at widely varying electrical field strength and temperatures and (iv) its sensitivity increases with decreasing thickness of a sample capacitor and hence with a decreasing amount of sample material. With these features BDS contributes to manifold topics in academic and applied research. In the talk the scaling of glassy dynamics in low molecular weight organic liquids, [1,2], charge transport in (ionic) liquids [3] and electrode polarisation effects at interfaces [4,5] will be addressed and discussed in detail.
References [1] F.Kremer, A. Schönhals (Eds.), Broadband Dielectric Spectroscopy, Springer, Berlin 2003 [2] Advances in Dielectrics, volume V: “The Scaling of Relaxation Processes” (Editors, F.Kremer, A.Loidl), Springer, Berlin 2018 [3] Advances in Dielectrics, volume III :“Dielectric properties of Ionic Liquids” (Editor, M. Paluch), Springer, Berlin 2016 [4] Serghei, A., M. Tress, J. R. Sangoro and F. Kremer, "Electrode polarization and charge transport at solid interfaces” Phys. Rev. B 80 184301 (2009) [5] Serghei, A., M.Samet,G. Boiteux and A.kallel “dielectric properties og Ionic Liquids at metal interfaces: Electrode polarization, Characteristic frequencies, scaling law” in Advances in Dielectrics, volume III :“Dielectric properties of Ionic Liquids” (Editor, M. Paluch), Springer, Berlin (2016)
Prof. Dr. Friedrich Kremer (University of Leipzig)
Professor of Molecular Physics
EDUCATIONAL BACKROUND: 1968-1973 Studies of physics, University of Munich 1973 Diploma in theoretical physics, University of Munich 1977 Ph.-D. in biology at the University of Freiburg i. Br. 1978-1985 Max-Planck-Institut für Festkörperforschung, (AG L.Genzel), Stuttgart 1985-1993 Max-Planck-Institut für Polymerforschung, (AG E.W. Fischer) Mainz 1992 Habilitation at the University of Mainz 1993 Chair of experimental physics, University of Leipzig since 1994 Co-Editor of the international journal “Colloid & Polymer Science“ 03/1999 - 03/2003 Chairman of the section "Polymerphysik" and "Chemische Physik und Polymerphysik" der Deutschen Physikalischen Gesellschaft (DPG) since 2015 Professor emeritus FIELDS OF EXPERTISE: Broadband Dielectric Spectroscopy (BDS), FT-IR-spectroscopy, Experiments with optical tweezers, Molecular dynamics in condensed soft matter.
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