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Shear-induced ordering in a liquid complex plasma

Nosenko, V. und Ivlev, Alexei und Morfill, Gregor E. (2014) Shear-induced ordering in a liquid complex plasma. 9th Liquid Matter Conference, 21-25 July 2014, Lisbon, Portugal.

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Kurzfassung

A complex, or dusty plasma is a suspension of small solid particles in an ionized gas. Particles get charged by collecting electrons and ions from the ambient plasma and interact with each other via a screened Coulomb (Yukawa) pair potential. Complex plasmas are often strongly coupled and can exist in liquid and even crystallized forms. In our experiment [1], polymer microspheres with a diameter of 9.19 μm were suspended in the plasma sheath above the lower electrode in a radio-frequency discharge in argon. The particle suspension self-organized in a highly ordered single-layer triangular lattice. Shear stress was applied to this plasma crystal by pushing a stripe of particles by the radiation pressure force of a rastered laser beam. We applied increasing levels of shear stress to the crystal. At low stress, the crystal deformed elastically. At higher stress, the following stages were observed: defect generation while in a solid state, onset of plastic flow, and fully developed shear flow. We observed shear-induced reordering in a flowing liquid complex plasma. We made two related observations. First, a flowing liquid complex plasma is not completely isotropic. Rather, on top of an isotropic particle distribution appears a weak triangular order with Θ=0° (where Θ is the angle between the laser beam and the closely packed rows of particles) even in the cases when the original triangular lattice was oriented at 30°. Similar anisotropy in a liquid complex plasma was observed in [2], where the initial triangular order with Θ=0° was not completely destroyed in a shear melted state. Second, after the laser was switched off, the liquid complex plasma re-crystallized in a triangular lattice with Θ=0°, even though the lattice was oriented at Θ=30° before melting. A flowing liquid complex plasmas, therefore, favors particle ordering where "closely packed lines" are oriented along the flow. The observed particle ordering is similar to the formation of particle strings aligned in the flow direction in sheared 2D colloidal dispersions [3] and simulated liquid of soft disks [4]. Here, we observed it for the first time in a sheared complex plasma. [1] V. Nosenko, A. V. Ivlev, and G. E. Morfill, Phys. Rev. E 87, 043115 (2013). [2] V. Nosenko, A. V. Ivlev, and G. E. Morfill, Phys. Rev. Lett. 108, 135005 (2012). [3] E. J. Stancik, A. L. Hawkinson, J. Vermant, G. G. Fuller, J. Rheol. 48, 159 (2004). [4] S. Butler and P. Harrowell, Phys. Rev. E 54, 457 (1996).

elib-URL des Eintrags:https://elib.dlr.de/95367/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Shear-induced ordering in a liquid complex plasma
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Nosenko, V.v.nosenko (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Ivlev, AlexeiMax-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, GermanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Morfill, Gregor E.Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, GermanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2014
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:complex plasma, shear-induced ordering
Veranstaltungstitel:9th Liquid Matter Conference
Veranstaltungsort:Lisbon, Portugal
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:21-25 July 2014
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 - Komplexe Plasmen / Laborforschung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Forschungsgruppe Komplexe Plasmen
Hinterlegt von: Nosenko, Volodymyr
Hinterlegt am:23 Feb 2015 16:21
Letzte Änderung:23 Feb 2015 16:21

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