Regensburg 2025 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 9: Poster
MM 9.25: Poster
Monday, March 17, 2025, 18:30–20:30, P1
Structure formation and phase behavior of amine-water mixtures — •Lena Friedrich1, Michael Paulus1, Aurélien Perera2, Martina Požar3, Dirk Lützenkirchen-Hecht4, Nicola Thiering1, Jaqueline Savelkouls1, and Christian Sternemann1 — 1Fakultät Physik / DELTA, Technische Universität, 44221 Dortmund, Germany — 2Sorbonne Université, Laboratoire de Physique Théorique de la Matière Condensée, F75252, Paris cedex 05, France; — 3University of Split, Faculty of Science, 21000 Split, Croatia — 4Fakultät für Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, 42097 Wuppertal, Germany
Amines are associating liquids that can form transient supramolecular structures via hydrogen bonding [1]. Adding of water can significantly alter the liquids' structure [2] and amine/water mixtures show an interesting phase behavior exhibiting a lower critical solution temperature (LCST) [3]. We studied linear, primary amines mixed with various proportions of water for a variety of temperatures by X-ray diffraction at BL8 and BL9 of DELTA (TU Dortmund). The structure factor prepeak shows a peculiar concentration and temperature dependence which resembles the different phase regimes ranging from disordered nematic via single liquid to two liquid phase. We thank the BMBF for funding via DAAD in the scope of the French-German collaboration PROCOPE 2024-2025 (Project-IDs 57704875 and 50951YA). [1] A. Perera et al., JPC B 44, 128 (2024). [2] L. Almasy et al., PCCP 21, 9317 (2019); [3] J. Glinski et al., J. Colloid. Interface Sci. 162, 129-134 (1994)
Keywords: XRD; amines; associating liquids