Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 47: Charged Soft Matter

CPP 47.1: Hauptvortrag

Freitag, 15. März 2013, 09:30–10:00, H34

Ion transport in polyelectrolyte materials: Mechanisms and general scaling concepts — •Monika Schönhoff, Cornelia Cramer, Souvik De, and Amrtha Bhide — University of Muenster, Münster, Germany

Polyelectrolyte multilayers (PEM) and polyelectrolyte complexes (PEC) are interesting materials for application as ion conductors, as they can be tuned with defined thickness or defined stoichiometry, respectively. Ac conductivity spectra characterize the ionic transport processes over many decades of frequency, providing a full picture of long-range as well as local motions. In temperature-dependent spectra of dry PEC the time-temperature superposition principle (TTSP) is shown to be valid. For spectra taken at different relative humidity a new scaling principle in analogy to TTSP termed time-humidity superposition principle is established. This model-free scaling holds for different materials over several decades in frequency. It implies that the hydration is activating ion motion over short and long distances in a similar general way, a concept so far only established for thermal energy.