Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 9: Solid-Liquid Interfaces: Structure, Spectroscopy I

O 9.8: Vortrag

Montag, 20. März 2017, 12:15–12:30, WIL C307

Ions at hydrophobic interfaces — •Yury Forov¹, Michael Paulus¹, Susanne Dogan¹, Paul Salmen¹, Christopher Weis¹, Mirko Elbers¹, Simon Egger², Elena Zwar², and Metin Tolan¹ — ¹Fakultät Physik/DELTA, TU Dortmund, 44221 Dortmund, GER — ²Physikalische Chemie, TU Dortmund, 44221 Dortmund, GER

The investigation of the microscopic structure of water is one of the important areas of modern research [1]. In particular, the understanding of the behavior of water at interfaces is essential for the explanation of interfacial phenomena in several natural and technological environments [2]. Hereby, one important research area is the behavior of ions at hydrophobic interfaces [3]. Much pioneer work has been done to describe the interactions between ions and hydrophobic surfaces, but a complete description of the physical mechanism of the hydrophobic interaction is still pending [4]. We investigated the adsorption behavior of ions of aqueous salt solutions at hydrophobic interfaces as a function of different ionic radii and concentrations by means of x-ray reflectivity at ambient conditions. The use of high energy x-rays allows the analysis of buried interfaces in-situ and thus can be used for studying the properties of multilayer systems, such as layer thickness, roughness, and electron density. We observed changes in the shape of the hydrophobic interface both with rising salt concentrations and ion radii for different salt types. [1] A. Nilsson and L.G.M. Pettersson, Chem. Phys. 389, 1 (2011); [2] D. Chandler, Nature 437, 640-647 (2005); [3] P. Jungwirth and B. Winter, Annu. Rev. Phys. Chem. 59, 343-366 (2008); [4] S. H. Donaldson et al., Langmuir 31, 2051-2064 (2015)