Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 99: Organic Molecules on Inorganic Substrates VI: Adsorption, Growth and Networks
O 99.11: Talk
Thursday, March 19, 2020, 13:15–13:30, GER 38
Gas adsorption on hydrophobic surfaces near the critical point — •Mike Moron, Göran Surmeier, Marc Moron, Jennifer Bolle, Julia Nase, Michael Paulus, and Metin Tolan — Fakultät Physik/DELTA, TU Dortmund, 44227 Dortmund, Germany
Hydrophobic surfaces and their interaction with their environment are of great importance in current research. One important example is the interaction between the so-called surfactants in the alveoli of the lung and the surrounding gas. The surfactants form monolayers inside the alveoli, that are orientated with their hydrophobic hydrocarbon chains towards the gas space. Together with various proteins, the surfactants are involved in the gas exchange and the stabilization of the alveoli. Since the surfactant monolayers are in direct contact with the inhaled air, including argon and CO2, it is essential to investigate the interaction in order to understand the processes involved. Another important example is the adsorption of CO2. The usage of metal-organic frameworks (MOFs) appear to be a promising method for storaging CO2. A self-assembled octadecyltrichlorsilane (OTS) monolayer on a silicon wafer, served as hydrophobic surface. The gases under investigation were CO2 and Ar at different gas pressures. Besides, we used hexafluorethane (C2F6) to study the effect of different gases on the adsorption behavior. We performed an X-ray-reflectivity experiment with a beam energy of 27 keV at the beamline BL9 at DELTA, allowing to resolve the formed structures and gas adsorption layers.