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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. 48th EPS Plasma Physics Conference, 2022-06-27 - 2022-07-01, Online. (Unpublished)

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Official URL: https://www.epsplasma2022.eu/


Two-dimensional complex plasma containing active Janus particles was studied experimentally. A single layer of micron-size 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 energetically moved around 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 oppositely directed ion drag force. The mean-squared displacement of the particles scaled as t^a with a=2 at small times t indicating ballistic motion and a=1/2 at longer times due to the combined effect of particle activity and external confinement.

Item URL in elib:https://elib.dlr.de/187328/
Document Type:Conference or Workshop Item (Speech)
Title:Two-dimensional complex (dusty) plasma with active Janus particles
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:1 July 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:complex plasma, active matter, Janus particles
Event Title:48th EPS Plasma Physics Conference
Event Location:Online
Event Type:international Conference
Event Start Date:27 June 2022
Event End Date:1 July 2022
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:13 Jul 2022 19:40
Last Modified:24 Apr 2024 20:48

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