Berlin 2018 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 40: Wetting, Microfluidics and Confined Liquids I (joint session CPP/DY)
CPP 40.10: Talk
Wednesday, March 14, 2018, 12:15–12:30, C 264
Collective Orientational Order and Phase Behavior of a Discotic Liquid Crystal under Confinement — •Arda Yildirim1, Kathrin Sentker2, Patrick Huber2, and Andreas Schönhals1 — 1Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany — 2Institut für Materialphysik und -technologie, Technische Universität Hamburg, Eißendorfer Str. 42, 21073 Hamburg, Germany
Discotic liquid crystals (DLCs) are a promising class of soft matter for electronic applications. This is due to their ability to self-organize into columns in a hexagonal columnar mesophase, driven by the overlapping of the π orbitals of their aromatic cores. 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) was confined into parallel aligned cylindrical nanopores of anodic aluminum oxide (AAO) membranes by melt infiltration. Furthermore, the pore surfaces of a series of membranes were chemically modified, resulting in a more hydrophobic pore surface than the unmodified ones. Collective orientational order and phase behavior of HAT6 confined into modified and unmodified nanopores of AAO were investigated by broadband dielectric spectroscopy and differential scanning calorimetry respectively. [1] C. Krause and A. Schönhals, J. Phys. Chem. C, 2013, 117, 19712. [2] C. Krause et al., Colloid Polym. Sci., 2014, 292, 1949