Dresden 2014 – wissenschaftliches Programm

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SOE: Fachverband Physik sozio-ökonomischer Systeme

SOE 9: Poster - Glasses / Stat. Phys. Bio. / Networks (joint session DY/BP/CPP/SOE)

SOE 9.12: Poster

Dienstag, 1. April 2014, 09:30–12:30, P1

Temperature and pressure dependence of the supramolecular structure of 2-ehyl-1-hexanol and 4-methyl-3-heptanol — •Thomas Büning¹, Christian Sternemann¹, Catalin Gainaru², Michael Paulus¹, Kolja Mende¹, Florian Wirkert¹, Irena Kiesel¹, Johannes Möller¹, Julia Nase¹, Stefan Bauer², Roland Böhmer², and Metin Tolan¹ — ¹Fakultät Physik/DELTA, Technische Universität Dortmund, D-44221 Dortmund — ²Fakultät Physik/E3, Technische Universität Dortmund, D-44221 Dortmund

Hydrogen bonds are essential for structure and dynamics of e.g. alcohols, aqueous solutions and water. Due to their low tendency to crystallization and large variability in molecular configuration, monohydroxy alcohols are a typical system that is studied to learn about the impact of hydrogen-bonding on molecular liquids. Because of the hydrogen bonds alcohols form supramolecular structures in the liquid phase. Here, the molecular arrangements of monohydroxy alcohols such as 2-ethyl-1-hexanol (2E1H) and 4-methyl-3-heptanol (4M3H) strongly depend on the position of the OH group within the molecule. Based on dielectric spectroscopy molecular arrangements in chain-like (2E1H) and, ring-like (4M3H) structures have been proposed. We present an x-ray diffraction study of 2E1H and 4M3H, providing new information regarding the supramolecular structure in pressure up to 4 kbar and temperature down to -110 °C.