Regensburg 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster: Nanoparticles and Composite Materials
CPP 12.13: Poster
Montag, 11. März 2013, 17:30–19:30, Poster C
Analyzing the electrical properties of percolating carbon nano-tubes or nano-fibers in composite-materials — •Michael Konter1, Pablo Carballeira2, Bernd Wetzel2, and Rolf Pelster1 — 1Fachrichtung 7.2 Experimentalphysik, Universität des Saarlandes, Saarbrücken, Germany — 2Institut für Verbundwerkstoffe GmbH, Kaiserslautern, Germany
We compare different types of composite materials containing carbon nano-fibers (CNF) or carbon nano-tubes (CNT) with fillings ranging from 0-2%. These were dispersed in an epoxy resin either with a three roll calendar device or with a torus mill laboratory mixing device. After polymerization solid samples are obtained that were characterized via temperature dependent dielectric spectroscopy (10 Hz - 2 GHz, 40 K - 290 K). For samples above the percolation threshold (fc=0,08 vol. %) we observe a broad polarization process, that is correlated with the dc-conductivity. An effective medium analysis reveals several intrinsic parameters. Here we discuss (i) the ratio of the inter-fiber or inter-tube contact resistance to the intrinsic resistance, Rcontact/Rcarbon and (ii) the product of percolation strength and intrinsic CNT or CNF conductivity, C · σcarbon, as well as its activation energy. The data reveals the quality of the inter-fiber contacts and thus reflects differences in the sample preparation.