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Veranstaltungsdatum:  25. Oktober 2018 16:00 Uhr

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Prof. Dr. Zuzanna Siwy, Department of Physics and Astronomy, University of California


Solid/liquid interfaces in various media: designing components of ionic circuits


Properties of solid/liquid interface determine transport properties of nanosystems such as nanopores. Inspiration to probe ionic and molecular transport at the nanoscale comes from nature where ion channels in a cell membrane regulate transport of ions in and out of the cell.

Channels that are responsive to external stimuli including change of the transmembrane potential, chemical or mechanical stress are the basis of all physiological processes of a living organism. I will describe our efforts to prepare biomimetic nanopores with tunable geometry and surface characteristics, which function as a rectifier, diode, and transistor for ions. These system could also be considered as ionic equivalents of electronic devices. I will also present our newest results on designing nanopores that are selective for one type of cation, mimicking the behavior of biological potassium channels. Our potassium selective nanopores transport potassium ions 100 times more efficiently than sodium ions. Finally, I will discuss unique properties of solid/liquid interfaces in organic media. Experiments will be shown, which demonstrate that a solvent can play an important role in the formation of effective surface potential.


Veranstaltungsort:  Universität Stuttgart, Campus Vaihingen, Institut für Computerphysik (ICP)
Seminarraum 1.079
Allmandring 3
70569  Stuttgart