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[Seminar] P3S Webinar: Ion transport and NMR transport measurement
October 1, 2020 @ 4:00 pm - 5:00 pm
P3S Webinar by Institute of Physics, MLU
Thursday, October 1st, 2020, 4 pm CEST
The online meeting takes places via zoom. More information: http://www.physik.uni-halle.de/fachgruppen/nmr/p3s-webinar/upcoming-p3s-webinars/
Prof. Dr. Nitash Balsara
Chemical and Biomolecular Engineering, UC Berkely
Ion transport in polymer electrolytes for lithium batteries and electrophoretic NMR
I will discuss some of the fundamental factors that limit ion transport in polymers. In all electrolytes, the current generated at steady state is governed by the applied potential. This relationship, which one might call a modified Ohm’s Law, depends on Stefan-Maxwell diffusion coefficients. We find that these diffusion coefficients in many electrolytes are negative over a substantial salt concentration range. The relationship between Stefan-Maxwell diffusion coefficients and ion velocities measured by electrophoretic NMR will be discussed.
Prof. Dr. Lou Madsen
Dept. of Chemistry, Virginia Tech, Blacksburg
Tracking motions in soft materials by NMR diffusometry: Discoveries and dangers
Our group combines NMR transport measurements that are species-specific and length/time-scale specific with structural and dynamical information to build comprehensive models for the behaviors of soft materials. I will touch on transport phenomena in polymer-based systems that include nanometer-scale confinement in separations membranes, and drug and chain partitioning in micelles. I will also describe a few of the classic (and yet still ubiquitous) pitfalls in the interpretation of NMR diffusion data.