Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 43: Poster: The Physics of Water Interactions with Biological Matter

CPP 43.9: Poster

Mittwoch, 9. März 2016, 18:15–21:00, Poster B2

The local structure in concentrated yttrium(III) chloride aqueous solutions under high hydrostatic pressure — •Mirko Elbers¹, Karin Julius¹, Michael Paulus¹, Christian Sternemann¹, Florian Wirkert¹, Julia Nase¹, Paul Salmen¹, Göran Surmeier¹, Ralph Wagner², and Metin Tolan¹ — ¹Fakultät Physik/DELTA, TU Dortmund, Germany — ²Fachbereich C - Physik, Bergische Universität Wuppertal, Germany

We present an extended X-ray absorption fine structure (EXAFS) study on the hydration properties of yttrium(III) chloride (YCl₃) under high hydrostatic pressures. In order to take a closer look at ion-ion interactions, aqueous salt solutions with different concentrations were investigated. In nature, the interaction between macromolecules or nanoparticles is mediated by the surrounding aqueous phase. Thus, changes in the water structure, e.g. by the application of pressure or the addition of ions, have a direct impact on the particle-particle interaction potential. For example, in a pressure dependent small angle X-ray scattering study of dense aqueous lysozyme solutions, we found a minimum of the attractive interaction strength at a hydrostatic pressure of 2 kbar. This effect was assigned to a collapse of the second hydration shell of the surrounding water, which might be affected by the addition of ions. Hence, we studied the pressure dependence of the local structure of salt solutions by EXAFS measurements between 1 bar and 5 kbar at concentrations of up to 3M. Furthermore, we performed additional molecular dynamics (MD) simulations of the investigated sample system to interpret the experimental data.