Berlin 2015 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 27: Posters: Complex Fluids and Soft Matter
BP 27.3: Poster
Dienstag, 17. März 2015, 14:00–16:00, Poster A
Extended X-ray absorption fine structure investigation of aqueous salt solutions under high pressure — •Karin Julius1, Christian Sternemann1, Michael Paulus1, Thomas Büning1, Karin Esch1, Julian Schulze1, Patrick Degen2, Ralph Wagner3, and Metin Tolan1 — 1Fakultät Physik / Delta, TU Dortmund, 44221 Dortmund, Germany — 2Ruhr-Universität Bochum, Lehrstuhl für Physikalische Chemie, 44780 Bochum, Germany — 3Fachbereich C Physik, Bergische Universität Wuppertal, Gaußstr. 20, 42097 Wuppertal, Germany
The study of the structural impact that water (de)stabilizing agents have upon the bulk solvent medium under high hydrostatic pressure can give comprehensive insight to the stabilization or destabilization of proteins in solution. We use extended X-ray absorption fine structure (EXAFS) analysis in order to investigate the influence of pressures up to 5 kbar on the local water network around Rb+ and Y3+ in 0.1 M salt solutions of RbCl and YCl3. The EXAFS measurements have been performed at beamline BL8 of DELTA (Dortmund) with a high pressure cell in vicinity of the Rb and the Y K-edge. Within the limits of the experiment, the spectra show evidence that the first hydration shells around Rb+ and Y3+ are not influenced by the pressure increase while the surrounding bulk water gets compressed. MD-simulations of the salt solutions in a pressure range from 50 to 5000 bar were performed to discuss the experimental results.