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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 21: Poster II
CPP 21.9: Poster
Dienstag, 19. März 2024, 18:00–20:00, Poster E
Structure formation in aqueous amine solutions — •Lena Friedrich1, Dirk Lützenkirchen-Hecht2, Michael Paulus1, Aurélien Perera3, Martina Požar4, and Christian Sternemann1 — 1Fakultät Physik / DELTA, Technische Universität, 44221 Dortmund, Germany — 2Fakultät für Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, 42097 Wuppertal, Germany — 3Sorbonne Université, Laboratoire de Physique Théorique de la Matière Condensée (UMR CNRS 7600), F75252, Paris cedex 05, France — 4University of Split, Faculty of Science, 21000 Split, Croatia
Amines are associating liquids that can form transient supramolecular structures via hydrogen bonding [1]. Adding water can significantly alter the liquids' molecular structure. We studied linear, primary amines mixed with various proportions of water, which we heated and cooled, by X-ray diffraction performed at beamline BL8 of DELTA (TU Dortmund). The structure factor pre-peak shows a peculiar concentration dependence when water is added. It significantly gains intensity with increasing water content and shifts to smaller wave-vector transfers. This effect is even more pronounced the longer the carbon chain of the amine is. With temperature increase the intensity of the pre-peak decreases. These observations are interpreted in terms of transient cluster formation using molecular dynamics simulations [2]. 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] L. Almasy et al., PCCP 21, 9317 (2019); [2] M. Požar and A. Perera, J. Mol. Liquids 227, 210 (2017).
Keywords: XRD; structure formation; amines