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Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

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

O 9.8: Talk

Monday, March 20, 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 Tolan11Fakultät 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)

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