Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures

Possible mechanisms of particle attraction providing formation of the field aligned microparticle strings in complex plasmas at elevated gas pressures are theoretically investigated in the light of the Plasmakristall-4 (PK-4) experiment on board the International Space Station. The particle interact...

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Main Authors: Victoria Yaroshenko, Mikhail Pustylnik
Format: Article
Language:English
Published: MDPI AG 2021-01-01
Series:Molecules
Subjects:
Online Access:https://www.mdpi.com/1420-3049/26/2/308
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spelling doaj-1f5e8b59f99a4090b52c2249c21134972021-01-10T00:03:23ZengMDPI AGMolecules1420-30492021-01-012630830810.3390/molecules26020308Possible Mechanisms of String Formation in Complex Plasmas at Elevated PressuresVictoria Yaroshenko0Mikhail Pustylnik1Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 82234 Wessling, GermanyInstitut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 82234 Wessling, GermanyPossible mechanisms of particle attraction providing formation of the field aligned microparticle strings in complex plasmas at elevated gas pressures are theoretically investigated in the light of the Plasmakristall-4 (PK-4) experiment on board the International Space Station. The particle interaction energy is addressed by two different approaches: (i) using the dynamically screened wake potential for small Mach numbers derived by Kompaneets et al., in 2016, and (ii) introducing effect of polarization of the trapped ion cloud by discharge electric fields. Is is found that both approaches yield the particle interaction energy which is independent of the operational discharge mode. In the parameter space of the performed experiments, the first approach can provide onset of the particle attraction and string formation only at gas pressures higher than 40–45 Pa, whilst the mechanism based on the trapped ion effect yields attraction in the experimentally important pressure range 20–40 Pa and may reconcile theory and observations.https://www.mdpi.com/1420-3049/26/2/308structural properties of fluidsplasma-related fluidsstring fluidscomplex plasmaselectrorheological plasmasinteraction potential
collection DOAJ
language English
format Article
sources DOAJ
author Victoria Yaroshenko
Mikhail Pustylnik
spellingShingle Victoria Yaroshenko
Mikhail Pustylnik
Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures
Molecules
structural properties of fluids
plasma-related fluids
string fluids
complex plasmas
electrorheological plasmas
interaction potential
author_facet Victoria Yaroshenko
Mikhail Pustylnik
author_sort Victoria Yaroshenko
title Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures
title_short Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures
title_full Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures
title_fullStr Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures
title_full_unstemmed Possible Mechanisms of String Formation in Complex Plasmas at Elevated Pressures
title_sort possible mechanisms of string formation in complex plasmas at elevated pressures
publisher MDPI AG
series Molecules
issn 1420-3049
publishDate 2021-01-01
description Possible mechanisms of particle attraction providing formation of the field aligned microparticle strings in complex plasmas at elevated gas pressures are theoretically investigated in the light of the Plasmakristall-4 (PK-4) experiment on board the International Space Station. The particle interaction energy is addressed by two different approaches: (i) using the dynamically screened wake potential for small Mach numbers derived by Kompaneets et al., in 2016, and (ii) introducing effect of polarization of the trapped ion cloud by discharge electric fields. Is is found that both approaches yield the particle interaction energy which is independent of the operational discharge mode. In the parameter space of the performed experiments, the first approach can provide onset of the particle attraction and string formation only at gas pressures higher than 40–45 Pa, whilst the mechanism based on the trapped ion effect yields attraction in the experimentally important pressure range 20–40 Pa and may reconcile theory and observations.
topic structural properties of fluids
plasma-related fluids
string fluids
complex plasmas
electrorheological plasmas
interaction potential
url https://www.mdpi.com/1420-3049/26/2/308
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AT mikhailpustylnik possiblemechanismsofstringformationincomplexplasmasatelevatedpressures
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