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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 33: Poster Session III

CPP 33.3: Poster

Dienstag, 13. März 2018, 14:00–16:00, Poster C

Density determination of liquids in the pressure range up to 5000 bar — Julia Nase, Miren Büyükasik, Mirko Elbers, Michael Paulus, Paul Salmen, Christian Sternemann, •Göran Surmeier, and Metin Tolan — Fakultät Physik/DELTA, TU Dortmund, 44221 Dortmund, Germany

The knowledge of the density of liquids is of high importance in many fields of research. Densities need to be known e.g., for the exact analysis of Terahertz spectroscopy data or X-ray scattering data. Exact values are also needed to verify theoretical density models and as parameter for Molecular Dynamics simulations of liquids. Densities of liquids are typically measured in a vibrating tube densitometer (VTD) with high accuracy, however limited to a small range of temperature and pressure. Notably, the pressure can be increased to several 100 bar only. From the increasing interest in high hydrostatic pressure conditions in the last years, the need for density data in the kbar regime was arising. We present a setup to determine densities of liquid samples from X-ray absorption measurements at pressures up to 5000 bar. Comparing to numerical simulations and data from a VTD, we show that relative density changes can be determined reliably in the whole pressure range. Trimethylamine-N-oxide, urea, and salt solutions were examined. Experiments were performed at beamline BL8 of DELTA (Dortmund, Germany).