Regensburg 2022 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session 2
MM 18.11: Poster
Dienstag, 6. September 2022, 17:30–20:00, P2
Structural and Textural Transitions of Discotic Ionic Liquid Crystals in Nanoporous Solids — •Zhuoqing Li1, Patrick Huber1, Sabine Laschat2, Aileen Raab2, Andreas Schönhals3, and Mohamed A. Kolmangadi3 — 1Institute for Materials and X-Ray Physics, Technische Universität Hamburg, Hamburg, Germany — 2Institut für Organische Chemie, Universität Stuttgart, Stuttgart, Germany — 3Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
Discotic ionic liquid crystals (DILCs) derived from 3,4- dihydroxyphenylalanine (DOPA) have synergetic properties of liquid crystals and ionic liquids. Driven by the π*π interactions among the aromatic cores, DILCs may self-organize, leading to a hexagonal ordered columnar liquid crystalline mesophase. Embedding of DILCs in nanoporous solids allows one to design hybrid materials with 1-D ionic conductivity pathways on the single-nanopore scale and tailorable photonic properties. The structural organization of confined DILCs is determined by a interplay of geometrical constraints and interfacial interactions at the pore wall and thus depends on pore size, temperature treatment and molecular wall anchoring. The optical birefringence experiments and small angle X-ray scattering results indicate ordered liquid crystalline mesophases of different collective orientations as a function of anchoring of the DILC discs at the pore surface. In particular, these experiments suggest that depending on the pore size a transition from the formation of circular concentric ring structures to an arrangement, where the columns are aligned parallel to the pore axis occurs.