Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 44: P9: Crystallization, Nucleation and Self Assembly
CPP 44.7: Poster
Mittwoch, 18. März 2015, 10:00–13:00, Poster A
A soft, bilayer phase in nanoparticle-doped n-CB homologues — •Alexander Lorenz1, Dena M. Agra-Kooijman2, Dean R. Evans3, Heinz-S. Kitzerow4, and Satyendra Kumar2 — 1Stranski-Laboratorium, Sek. TC 9, Technische Universität Berlin, Str. des 17. Juni 124, 10623 Berlin, Germany — 2Department of Physics, Kent State University, Kent, Ohio 44242, USA — 3Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Ohio 45433, USA — 4Department of Chemistry, Universität Paderborn, Warburger Straße 100, 33098 Paderborn, Germany
Several homologues of the n-alkyl-cyanobiphenyl series were doped with BaTiO3 nanoparticles (dispersed in heptane) [1,2]. Synchrotron x-ray scattering experiments of the doped n-pentyl-cyanobiphenyl and n-octyl-cyanobiphenyl samples revealed nine orders of a primary Bragg reflection, respectively [2]. These scattering signals were caused by a soft, one-dimensional multilayer structure and were not present in the neat substances. The scattering signals were used to calculate the electron density profiles inside the multilayers by Fourier analysis; the multilayers were found to be one-dimensional, multilayered, smectic nanostructures in each case. In conclusion, doping clearly induced a novel, self-assembled nanostructure in which the rigid aromatic part, and not the overall length, of the molecules defined the layer spacing. A. Lorenz et al. Physical Review E 86, 051704 (2012). A. Lorenz et al., Physical Review E 88, 062505 (2013).