Volume 58, Number 6, June 2002
|Page(s)||919 - 925|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 June 2002|
Structure and tracer-diffusion in quasi–two-dimensional and strongly asymmetric magnetic colloidal mixtures
Institut für Festkörperforschung, Teilinstitut Weiche
Materie Forschungszentrum Jülich - D-52425 Jülich, Germany
2 Fachbereich Physik, Universität Konstanz Postfach 5560, D-78457 Konstanz, Germany
Corresponding author: email@example.com
Accepted: 20 March 2002
We study theoretically and experimentally static and diffusional properties of a strongly asymmetric binary mixture of super-paramagnetic colloids confined to an air-water interface. The colloids interact via repulsive dipolar forces, induced by a magnetic field applied perpendicular to the planar interface. Brownian dynamics (BD) computer simulations are employed to analyse the microstructure and the tracer-diffusion of both components. The profound interaction asymmetry leads to unusual features in the partial pair distribution functions, and to significantly enhanced tracer-diffusion. We find good agreement between our experimental data and the computer simulation results.
PACS: 82.70.Dd – Colloids / 05.40.Jc – Brownian motion / 05.10.Gg – Stochastic analysis methods (Fokker-Planck, Langevin, etc.)
© EDP Sciences, 2002
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