Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: Poster: Colloids and Complex Liquids
CPP 16.6: Poster
Dienstag, 27. März 2012, 18:15–20:45, Poster A
Neutronscattering on discotic liquid crystals in the bulk and in the nanoconfined state — •Christina Krause1, Bernhard Frick2, Reiner Zorn3, and Andreas Schönhals1 — 1BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205 Berlin, Germany — 2Institut Laue-Langevin, 6 rue Jules Horowitz, BP. 156, 38042 Grenoble, France — 3Research Centre Jülich, 52425 Juelich, Germany
Discotic liquid crystals (DLC) consist of a flat and rigid aromatic core substituted by flexible aliphatic chains. While the former is responsible for the pi-pi-stacking, the latter increases the solubility and gives rise to a rich thermotropic behavior. DLCs are self-assembled materials. The disc-shaped molecules organize into columns that further assemble into two-dimensional arrays with a hexagonal mesophase. The alkyl chains fill the intercolumnar space giving rise to a nanophase separated state. Triphenylene derivatives as model systems for DCLs were investigated by neutron scattering in the bulk and in the confined state where both the vibrational density of states as well as the molecular dynamics on a time scale of ca. 1 ns (elastic scans) were considered. The influence of both the structure (length of the aliphatic chains) and the confinement will be discussed in detail.