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DY: Fachverband Dynamik und Statistische Physik

DY 25: Interfaces and Thin Films II (joint session CPP/DY/O)

DY 25.1: Hauptvortrag

Dienstag, 17. März 2020, 09:30–10:00, ZEU 260

Phospholipid membranes as model systems for fundamental soft matter research — •Sebastian Jaksch — Forschungszentrum Jülich GmbH Jülich Centre for Neutron Science, Garching, Germany

Phospholipid membranes play an important role as interfaces in virtually all biological systems. By their interplay between structure and dynamics they provide the basic functions necessary to support living organisms, such as stability for the cells and trans-membrane transport for nutrients and drugs. Using SoyPC as an example, this presentation will give an overview of grazing incidence neutron techniques for structure and dynamics measurements of phospholipid membranes.[1] We investigated the structure with grazing incidence small-angle neutron scattering (GISANS) at extremely low background conditions [2] and correlated that data with grazing incidence neutron spin-echo spectroscopy [3] (GINSES). These investigations revealed thermally excited modes in the plane of the membrane and its corresponding structures. This modes could be frozen in at temperatures below room temperature and reappeared after reheating to physiological temperatures.

[1] Jaksch, S., Gutberlet, T., Müller-Buschbaum, P. (2019). Grazing Incidence Scattering - Status and Perspectives in Soft Matter and Biophysics. Current Opinion in Colloid & Interface Science.

[2] Jaksch, S., et al. (2019). Long-range excitations in phospholipid membranes. Chemistry and physics of lipids, 225, 104788.

[3] Jaksch, S., et al. (2017). Nanoscale rheology at solid-complex fluid interfaces. Scientific reports, 7(1), 4417.