Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.6: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Thermotropic Orientational Order of Discotics in Nanochannels: An Optical Polarimetry Study and Landau-de Gennes Analysis — •Mark Busch1, Sylwia Calus2, Carole V. Cerclier3, Ronan Lefort3, Denis Morineau3, Bernhard Frick4, Kristina Krause5, Andreas Schönhals5, Eric Grelet6, Daniel Rau7, Andriy V. Kityk2, and Patrick Huber1,7 — 1Materials Physics and Technology, Hamburg University of Technology, D-21073 Hamburg, Germany — 2Faculty of Electrical Engineering, Czestochowa University of Technology, 42-200 Czestochowa, Poland — 3Institut de Physique de Rennes, CNRS UMR 6251, UniversiteÏ de Rennes 1, 35042 Rennes, France — 4Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France — 5BAM Bundesanstalt für Materialforschung und -prüfung, 12205 Berlin, Germany — 6Centre de Recherche Paul-Pascal, CNRS UPR 8641, Université de Bordeaux 1, 33600 Pessac, France — 7Experimental Physics, Saarland University, 66041 Saarbrücken, Germany
Optical polarimetry measurements of the orientational order of a discotic liquid crystal (Py4CEH) confined in parallel-aligned nanochannels of monolithic, mesoporous alumina, silica, and silicon as a function of temperature, channel radius (3 - 22 nm) and surface chemistry reveal a competition of radial and axial columnar order. The evolution of the thermotropic nematic order parameter of the confined systems is continuous, in contrast to the discontinuous transition in the bulk. This behaviour is analyzed by Landau-De Gennes models for discotic order in nanoconfinement.