Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Poster: Glass Transition and Dynamics of Liquids
CPP 22.8: Poster
Dienstag, 15. März 2011, 18:00–20:00, P2
Investigation of discotic liquid crystals — •Christina Krause, Huajie Yin, and Andreas Schönhals — BAM, Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205 Berlin, Germany
Broadband Dielectric Spectroscopy is applied in a broad frequency (10−1−109 Hz) and temperature range (173-283 K) to study the discotic liquid crystal Pyrene-1,3,6,8-tetracarboxylic tetra(2-ethylhexyl)esther, 2,3,6,7,10,11 Hexakis(pentyloxy)triphenylene and 2,3,6,7,10,11-Hexakis(hexyloxy)triphenylene in the bulk state. The temperature dependence of the relaxation rates of Pyrene-1,3,6,8-tetracarboxylic tetra(2-ethylhexyl)esther and 2,3,6,7,10,11-Hexakis(hexyloxy)triphenylene in the lower temperature range might be described by the Vogel-Fulcher-Tamann equation. For 2,3,6,7,10,11-Hexakis(pentyloxy)triphenylene the relaxation process in the lower temperature range shows an Arrhenius-type temperature dependence. To obtain an extensive understanding of the underlying processes Differential Scanning Calorimetry and Alternating Chip Calorimetry are performed. Investigations of Pyrene-1,3,6,8-tetracarboxylic tetra(2-ethylhexyl)esther confined to porous silicon membranes and similar measurements of other discotic liquid crystals will be carried out in the future.