Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Poster Tuesday: Nanostructures

O 41.3: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Ion adsorption at solid-liquid interfaces — •Alina Sparenberg, Michael Paulus, Yury Forov, Susanne Dogan, Göran Surmeier, Jennifer Bolle, Mirko Elbers, Kristina Berger, Kevin Foryt, and Metin Tolan — Fakultät Physik/DELTA, TU Dortmund, 44221 Dortmund

The investigation of the microscopic structure of aqueous solutions is one of the important areas of modern research. In particular, the understanding of the behavior of ions at interfaces is essential for the explanation of interfacial phenomena occurring in nature and technology. A lot of pioneering work has been done to determine the interactions between ions and hydrophobic surfaces, but a complete description of the physical mechanisms for the hydrophobic interaction is still pending. Thus, we used octadecyltrichlorosilane (OTS) coated surfaces in order to study the adsorption behavior of different ions at hydrophobic solid-liquid interfaces by x-ray reflectivity. Since a first study with alkali halides indicated changes within the structure of the OTS coating that seem to scale with the ion size, this study deals with the adsorption behavior of ions with strongly varying cation sizes. For this purpose, aqueous solutions of NaBr and the ionic liquid 1-Butyl-3-methylimidazolium bromide ([BMIM][Br]) were chosen. The reflectivity experiments were performed at the beamline BL9 of the synchrotron light source DELTA in Dortmund, Germany.