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Two-dimensional complex (dusty) plasma with active Janus particles

Nosenko, Volodymyr (2022) Two-dimensional complex (dusty) plasma with active Janus particles. Physics of Plasmas, 29, pp. 123701-1. American Institute of Physics (AIP). doi: 10.1063/5.0121734. ISSN 1070-664X.

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Official URL: https://aip.scitation.org/doi/10.1063/5.0121734


A two-dimensional complex plasma containing active Janus particles was studied experimentally. A single layer of micrometer-sized plastic microspheres was suspended in the plasma sheath of a radio-frequency discharge in argon at low pressure. The particle sample used was a mixture of regular particles and Janus particles, which were coated on one side with a thin layer of platinum. Unlike a suspension consisting of regular particles only, the suspension with inclusion of Janus particles did not form an ordered lattice in the experimental conditions used. Instead, the particles moved around with high kinetic energy in a disordered suspension. Unexpectedly, the mean kinetic energy of the particles declined as the illumination laser power was increased. This is explained by the competition of two driving forces, the photophoretic force and the oppositely directed ion drag force. The mean-squared displacement of the particles scaled as t^α with α = 2 at small times t indicating ballistic motion and α = 0.56±0.27 at longer times due to the combined effect of the Janus particle propensity to move in circular trajectories and external confinement.

Item URL in elib:https://elib.dlr.de/191674/
Document Type:Article
Title:Two-dimensional complex (dusty) plasma with active Janus particles
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:2 December 2022
Journal or Publication Title:Physics of Plasmas
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 123701-1
Publisher:American Institute of Physics (AIP)
Keywords:complex plasma, dusty plasma, active matter, Janus particles
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Model systems
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Nosenko, Volodymyr
Deposited On:06 Dec 2022 07:30
Last Modified:06 Dec 2022 07:30

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