Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 2: Interfaces and Thin Films I (joint session with DECHEMA and VDI)

CPP 2.2: Vortrag

Montag, 11. März 2013, 10:00–10:15, H40

The influence of compressed gases on lipid monolayers — Friederike Giebel, •Julia Nase, Michael Paulus, Steffen Bieder, Irena Kiesel, and Metin Tolan — Fakultät Physik/DELTA, TU Dortmund, 44221, Dortmund, Germany

An intact cell membrane is essential for the correct functionality of cells in the human body. Depending on their solubility and size, gas molecules can cross the cell barrier by diffusion through the membrane. Thus, the question of how diverse harmful substances can modify membranes is of eminent importance for the understanding of basic mechanisms of malfunctions. To reduce the complexity of the bilayer and gain access to more basic mechanisms, simple lipid monolayers are a well-established model system. These so-called Langmuir layers are formed at the water-gas interface if certain lipids are applied carefully to the water surface.

We investigated the influence of diverse pressurized gases on the structure of a lipid monolayer using high-energy synchrotron radiation at ID10 of ESRF. The vertical structure of the interface was determined via x-ray reflectivity measurements, whereas changes in the lateral structure were detected from GID measurements. We observed an adsorption of gas molecules on the lipid layer. A change in the film structure was evident in the presence of gas, and the Langmuir film remained stable.