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MM: Fachverband Metall- und Materialphysik
MM 19: Poster Session
MM 19.30: Poster
Dienstag, 10. März 2026, 18:00–20:00, P5
Molecular micro-heterogeneity: Structure formation and phase behavior in aqueous alkylamine mixtures — •Lena Friedrich1, Martina Požar2, Aurélien Perera3, Michael Paulus1, Nicola Thiering1, Jaqueline Savelkouls1, Eric Schneider1, Bernada Lovrinčević2, Dirk Lützenkirchen-Hecht4, and Christian Sternemann1 — 1Fakultät Physik / DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany — 2University of Split, Faculty of Science, 21000 Split, Croatia — 3Sorbonne Université, Laboratoire de Physique Théorique de la Matière Condensée, F75252 Paris, France — 4Fakultät für Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, 42097 Wuppertal, Germany
Aqueous alkylamines exhibit an unusual phase behavior [1] and an intruiging form of self-assembly [2]. X-ray diffraction experiments at BL8 and BL9 (DELTA, TU Dortmund) reveal intense structur factor pre-peaks that vary with composition and chain length, indicating peculiar micro-heterogeneity. Diffraction intensities calculated from MD simulations resemble the measured intensities and show bilayer-like arrangements in which amine headgroups saturate and stabilize water domains, forming transient clusters that prevent macroscopic phase separation, explaining the remarkable miscibility of aqueous amines compared to other associating liquids such as alcohols [3]. Supported by BMBF via DAAD in PROCOPE (57704875 & 50951YA). [1] J. Glinski et al., J. Colloid. Interface Sci. 162, 129-134 (1994); [2] L. Almasy et al., PCCP 21, 9317 (2019); [3] A. Perera et al., arXiv:2510.02146
Keywords: XRD; X-ray diffraction; alklyamines; associating liquids