Berlin 2018 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 68: Poster: Complex Fluids, Glasses, Granular

DY 68.12: Poster

Donnerstag, 15. März 2018, 15:30–18:00, Poster A

Structure formation in 4M3H/2E1H mixtures at low temeprature — •Jennifer Bolle, Christian Sternemann, Christian Albers, Göran Surmeier, Fatima Mallal, Robin Sakrowski, and Metin Tolan — Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany

Monohydroxy alcohols (MAs) have been scrutinized as a model of hydrogen bonded fluids. These hydrogen bonds are essential for the microscopic structure and dynamics of water, aqueous solutions and alcohols [1]. MAs are supposed to form supramolecular structures via hydrogen bonding in the liquid phase. Dielectric spectroscopy studies suggest ringlike arrangements for 4-methyl-3-heptanol (4M3H) and chainlike structures in 2-ethyl-1-hexanol (2E1H) and indicate a structural crossover for 4M3H/2E1H mixtures with temperature [2]. We present X-ray diffraction measurements of (2E1H)_x(4M3H)_1−x mixtures over a temperature range from 175K to 405K. The results point towards a change of the supramolecular structures indicated by analysis of the first diffraction peak.
[1] Kaatze, U., Behrends, R., and Pottel, R. Hydrogen network fluctuations and dielectric spectrometry of liquids. In: Journal of Non-Crystalline Solids . (2002), 305(1), 19-28. [2] Bauer, S., Wittkamp, H., Schildmann, S., Frey, M., Hiller, W., Hecksher, T., and Böhmer, R. Broadband dynamics in neat 4-methyl-3-heptanol and in mixtures with 2-ethyl-1-hexanol. In: The Journal of chemical physics. (2013), 139(13), 134503.