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DF: Fachverband Dielektrische Festkörper

DF 17: Nano- and microstructured dielectrics

DF 17.6: Vortrag

Donnerstag, 25. März 2010, 17:10–17:30, H11

Dielectric analysis of dispersed particles in composites of unknown microstructure — •Béatrice Hallouet, Carsten Volz, and Rolf Pelster — Universität des Saarlandes, FR 7.2 Experimentalphysik, D–66123 Saarbrücken, Germany

In general, the details of the microstructure in nanocomposites is unknown. Nevertheless there is a need to determine the intrinsic properties of the dispersed phase from the measured effective properties of the system. We present a method to extract at least a partial information using basic physical considerations, among other things energy conservation. The procedure is tested for composites consisting of a solid polymer filled with semi-conductive particles (Ga As in a epoxy resin) using broadband dielectric spectroscopy. From the measured dielectric spectra, which show polarisation peaks (MWS polarisation), we obtain boundaries for the permittivity and the conductivity of the particles.