Bremen 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

P: Fachverband Plasmaphysik

P 3: Dusty Plasmas I

P 3.2: Fachvortrag

Montag, 13. März 2017, 14:30–14:55, HS 1010

Structure and properties of two-dimensional binary mixtures — •Frank Wieben and Dietmar Block — Institute of Experimental and Applied Physics, Kiel University, Germany

Binary mixtures can occur in various systems, e.g. fluids, colloidal suspensions and strongly coupled complex plasmas. The primary characteristic of binary systems is the decomposition of the species under certain conditions. Complex plasmas, compared to fluids or colloidal suspensions, feature a low damping of the particles which allows for the investigation of dynamical processes. Under microgravity conditions dust particles in a complex plasma form three-dimensional clouds. If a second species is injected, a fast decomposition of the species is observed, even for small size disparities. In ground based experiments two species can form a two-dimensional binary monolayer if the charge-to-mass ratios are equal. However, there are no experiments on 2D binary mixtures yet and numerical simulations on binary Yukawa systems in parabolic traps predict no decomposition of the species. In this contribution first experiments on two-dimensional binary mixtures in complex plasmas are presented. Special attention is paid to the demanding experimental generation of these systems. The experiments are compared to molecular dynamics simulations that include imperfections of real complex plasmas.

This work was supported by the Deutsche Forschungsgemeinschaft DFG in the framework of the SFB TR24 Greifswald Kiel, Project A3b.