Hannover 2020 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Complex plasma and Low-temperature plasma and applications 2

P 18.1: Hauptvortrag

Donnerstag, 12. März 2020, 11:00–11:30, b302

Experiments on Binary Dust Mixtures — •Frank Wieben and Dietmar Block — Institute of Experimental and Applied Physics, Kiel University, Germany

A solid or fluid can drastically change its properties if an additional species of atoms or molecules is added. In the field of strongly coupled systems, colloidal dispersions were the first using polydisperse mixtures and observed phenomena like e.g. highly ordered alternating lattices. Naturally, the presence of a second species was expected to also impact closely related complex (dusty) plasmas, where solid as well as fluid states are accessible. The charged dust particles form two- or three-dimensional systems which are virtually undamped and allow for dynamical processes to emerge. Monodisperse systems proved to follow a One Component Plasma (OCP) description very well, thus serving as an ideal model experiment. Early microgravity experiments using two particle sizes revealed a demixing of the species, but recently the transition from demixed to mixed or even highly ordered binary complex plasmas was reported. This opened a completely new field and granted access to structural as well as (thermo-) dynamical properties of these systems. In this contribution an overview of the recent progresses in binary complex plasmas is given.