DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2002 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

CPP: Chemische Physik und Polymerphysik

CPP 15: Poster: Dünne Filme, Monolagen und Oberfl
ächen

CPP 15.11: Poster

Wednesday, March 13, 2002, 16:30–18:00, B

On the dynamics of surface layer in octylcyanobiphenyl-aerosil nanocomposites — •Stefan Frunza1, Ligia Frunza1, Harald Goering2, and Andreas Schoenhals21National Institute of Materials Physics, PO Box Mg07, R-76900 Bucharest-Magurele, Romania — 2Federal Institute of Materials Research and Testing, Unter den Eichen 87, D-12205 Berlin, Germany

A broadband dielectric study of the dispersions of silica spheres (Aerosil 380) in octylcyanobiphenyl (8CB) with densities between 0.083 and 10 g of silica per 1 cm3 of liquid crystal (LC) is reported. High values of silica densities were thus achieved for the first time to observe the behaviour of the LC monolayer on the surface of the silica particles. The relaxation characteristic of the bulk LC is noticed especially for the samples with low silica densities. Additionally, a slow relaxation was detected, even at temperatures for which the bulk LC is in the crystalline state. It was assigned to the surface layer of LC molecules. Remarkably, the temperature dependence of the relaxation rates for this slow process shows a behaviour typical for glass forming liquids.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2002 > Regensburg