Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 39: POSTERS Colloids and Liquids
CPP 39.32: Poster
Donnerstag, 26. März 2009, 17:00–19:30, P3
The Fréedericksz transition in thermoreversible nematic liquid-crystal gels — •Florian Heym1, Achim Sack1, Wolfgang Schöpf1, Ingo Rehberg1, Robin Pettau2, and Hans Werner Schmidt2 — 1Experimentalphysik V, Universität Bayreuth — 2Makromolekulare Chemie I, Universität Bayreuth
Liquid crystals like `5CB' are often gelified in order to increase the relaxation speed and to influence the liquid crystals' orientation and mechanical properties. As a gelator we use new ABA triblockcopolymers with a midblock containing Cyanobiphenyl. The properties of these nematic liquid-crystal gels are investigated and compared with ordinary nematics and nematics gelified by low molecular weight organogelators. We measure the dependency of the relaxation time of the Fréedericksz transition on the sample thickness using polarisation microscopy.