Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 43: Fluids and Glasses II
CPP 43.4: Vortrag
Mittwoch, 22. März 2017, 15:45–16:00, ZEU 255
Structure, Dynamics and Phase Behavior of a Discotic Liquid Crystal Confined in Nanoporous Anodic Aluminum Oxide Membranes — •Arda Yildirim1, Kathrin Sentker2, Patrick Huber2, and Andreas Schönhals1 — 1Bundesanstalt für Materialforschung und -prüfung [BAM] — 2Institut für Werkstoffphysik und -technologie, Technische Universität Hamburg-Harburg (TUHH)
Discotic liquid crystals (DLCs) are a promising class of soft matter for electronic applications. This is due to their ability to organize and stack themselves into columns in a hexagonal columnar mesophase, driven by the overlapping of the π-orbitals of their aromatic core. This leads to a high charge-carrier mobility along the column axis. Previous studies on DLCs showed that their properties, such as phase transition temperatures and enthalpies, are susceptible to nanoconfinement [1,2]. In this study, 2,3,6,7,10,11 hexakis[hexyloxy] triphenylene (HAT6), a triphenylene based DLC, was confined into parallel aligned cylindrical nanopores of anodic aluminum oxide (AAO) membranes by melt infiltration in the isotropic phase under an argon atmosphere. Furthermore, the pore surfaces of a series of membranes were chemically modified, resulting in a more hydrophobic pore surface than the unmodified ones. The structure, dynamics, and the phase behavior of HAT6 confined into modified and unmodfied nanopores of AAO were investigated by broadband dielectric spectroscopy and differential scanning calorimetry. Results will be discussed in detail.
[1] C. Krause and A. Schönhals, J. Phys. Chem. C, 2013, 117, 19712.
[2] C. Krause et al., Colloid Polym. Sci., 2014, 292, 1949.