Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Poster: Colloids and Complex Liquids
CPP 20.5: Poster
Dienstag, 12. März 2013, 18:15–20:15, Poster C
Vibrational density of states and molecular dynamics of discotic liquid crystals in the bulk and in the nanoconfined state investigated by neutron scattering — •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, B.P. 156, F-38042 Grenoble Cedex 9, France — 3Juelich Centre for Neutron Science, Forschungszentrum Juelich, 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-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. Two triphenylene derivatives as model systems for DLCs were investigated by neutron scattering in the bulk and confined in nanometre wide channels of anodic alumina membranes. 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 molecular structure (length of the aliphatic chains) and the confinement will be discussed in detail.