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Active Janus particles in a complex plasma

Nosenko, Volodymyr (2021) Active Janus particles in a complex plasma. 47th EPS Plasma Physics Conference, 21-25 June 2021, Online.

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Offizielle URL: https://epsplasma2020.eu/

Kurzfassung

A complex plasma is a suspension of micron-size solid particles in regular plasma. Complex plasmas are excellent model systems which are used to study various plasma-specific and generic phenomena at the level of individual particles. Their advantages include the possibility of direct and real-time observation of virtually undamped dynamics of the particles suspended in a rarefied gas. Active matter is a collection of active particles, which can convert the energy coming from their environment into directed motion, therefore driving the whole system far from equilibrium. Active matter has some intriguing physical properties and potentially a number of applications. It has recently become a hot topic of multiple interdisciplinary studies. A prominent example of particles that can be active in various environments is the so-called Janus particles, which have two sides with different properties. Janus particles where two sides were made of (or coated with) different metals were previously found to be active in certain aqueous solutions [1]. In this presentation, we report on our experiments with Janus particles - polymer microspheres half-coated with a thin layer of platinum - suspended in a gas discharge plasma. Our experimental setup was a modified Gaseous Electronics Conference (GEC) radio-frequency (rf) reference cell. Plasma was produced by an rf capacitively coupled discharge at 13.56 MHz in argon. The gas pressure was varied in the range of 0.66-13.3 Pa, the rf discharge power was in the range of 1-20 W. When suspended in plasma, the Janus particles moved in characteristic looped trajectories suggesting a combination of spinning and circling motion; their interactions led to the emergence of rich dynamics characterized by non-Maxwellian velocity distribution. The particle propulsion mechanism is discussed, the force driving the particle motion is identified as photophoretic force. 1. C. Bechinger, R. Di Leonardo, H. Löwen et al., Rev. Mod. Phys. 88, 045006 (2016).

elib-URL des Eintrags:https://elib.dlr.de/145026/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Active Janus particles in a complex plasma
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Nosenko, VolodymyrV.Nosenko (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:24 Juni 2021
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:complex plasmas; active particles; Janus particles
Veranstaltungstitel:47th EPS Plasma Physics Conference
Veranstaltungsort:Online
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:21-25 June 2021
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Forschung unter Weltraumbedingungen
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):R - PK-4
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Materialphysik im Weltraum > Gruppe Komplexe Plasmen
Hinterlegt von: Nosenko, Volodymyr
Hinterlegt am:01 Nov 2021 18:46
Letzte Änderung:08 Nov 2021 12:43

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