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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Poster Session I

CPP 20.53: Poster

Montag, 12. März 2018, 17:30–19:30, Poster A

Investigation of the impact of antifoam agents on lipid membranes by XRR and BAM — •Mike Moron, Susanne Dogan, Julia Nase, Michael Paulus, and Metin Tolan — Fakultät Physik/DELTA, TU Dortmund, 44221 Dortmund, Germany

The control of foam by means of antifoam agents is of great importance in a number of applications. For example, the oral administration of simethicone is prescribed in the case of surfactant intoxication and also in order to prepare patients for coloscopy. In both cases, simethicone reduces the amount of foam. Other domains where antifoam agents play a role are for example the kraft pulp process, radioactive waste treatment, and machine detergents. While the macroscopic behaviour of liquid systems containing antifoam agents and lipids is well understood, the modes of action on the molecular scale are not. Various theories were established to describe the molecular mechanisms, but the actual behaviour showed up to be strongly dependent on the system under investigation. We present a surface pressure-dependent in-situ X-ray reflectometry and Brewster-angle microscopy study on Langmuir-Blodgett monolayers consisting of different lipids and simethicone. Both the X-ray reflectivities and the BAM-measurements were performed at the liquid-air interface. The reflectivities provide information on the vertical structure of the systems, whereas the BAM-measurements reveal the lateral structure. With this combined information, it is possible to analyse the different models.