Dresden 2003 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 20: POSTER A

CPP 20.45: Poster

Montag, 24. März 2003, 19:00–21:00, ZEU/250

Temperature dependence of conductivity of a colloidal suspension at different particle densities — •Raquel Chulia Jordan, Martin Medebach, Holger Reiber, and Thomas Palberg — Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, 55099 Mainz

We investigated two species of highly charged polymer lattices in deionised aqueous suspension. The first one are monodisperse PnBAPS68 particles (diameter 68nm), the second PnBAPS122 particles (diameter 122nm) also are a kind gift from BASF. Sample conditioning used a closed pumping system to deionise the suspensions. Details have been given in (1). The density n could be varied by diluting the suspensions. At each chosen concentration n we measured the conductivity σ at different temperatures. Therefore the complete system was heated or cooled between T= 10⁰ C and T= 35⁰ C. The conductivity was measured in steps of maximum 130 measurement points per Δ T= 1⁰ C . From the evaluation of the σ -T-curves we could firstly check if the particles contribute to the conductivity and secondly we get access to the behaviour of Z* (effective charge) depending on the density and temperature.

(1)M.Evers, N.Garbow, D.Hessinger, and T. Palberg, Phys. Rev. E 57, 6774(1998).