Phasenverhalten von Mischungen aus aktiven und passiven Mikroschwimmern
Phasenverhalten von Mischungen aus aktiven und passiven Mikroschwimmern

Phasenverhalten von Mischungen aus aktiven und passiven Mikroschwimmern


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About the Book

Bachelorarbeit aus dem Jahr 2017 im Fachbereich Physik - Sonstiges, Note: 1,1, Technische Universität Berlin (Institut für Theoretische Physik), Sprache: Deutsch, Abstract: In dieser Arbeit wurden Phasenmischungen aus aktiven und passiven Mikroschwimmers mittels der Mulitple Particle Collision Dynamics (MPCD) Methode unter Verwendung des Squirmer Modells durchgeführt und der Einfluss verschiedener Mikroschwimmereigenschaften (Schwimmgeschwindigkeit, Verhältniss aktiver zu passiver Mikroschwimmer, Anzahl der Mikroschwimmer, Größe des Simulationsbereichs) auf das kollektive Verhalten untersucht. Die Arbeit enthält ausführliche Beschreibungen der MPCD (nummerische Methode zum Lösen der Stokes Gleichung), des Squirmer Modells und der Theorie der Fluid Dynamik. Mikroschwimmer sind mikrometergroße Teilchen, die sich eigenständig, trotz Abwesenheit externer Kräfte oder Drehmomente, in Flüssigkeiten fortbewegen können. Ansammlungen solcher Mikroschwimmer kommen in der Natur häufig vor, etwa als Suspensionen von Bakterien und anderer Mikroorganismen oder in Form von in Gruppen schwimmender Spermienzellen. Die Physik solcher Systeme von Mikroschwimmern ist hauptsächlich durch die Hydrodynamik bei niedriger Reynoldszahl und Brownscher Bewegung bestimmt. Von ihrer Erforschung erhofft man sich einerseits neue fundamentale Erkenntnisse für die statistische Physik des Nichtgleichgewichts. Andererseits lässt sich aus interagierenden aktiven Mikroschwimmern möglicherweise eine neue Klasse von aktiven Materialien mit neuen, definierbaren Eigenschaften formen. Ein besonders interessantes Ergebnis bisheriger Untersuchungen ist, dass Ansammlungen einer größeren Menge dicht gedrängter Mikroschwimmer unter bestimmten Bedingungen Cluster ausbilden. Diese Cluster sind dicht gedrängte, oft hexagonal dichtest gepackte Ansammlungen von Mikroschwimmern, die aufgrund der Einengung durch umgebende Mikroschwimmer fest an einen Ort verharren. Diese mehr oder weniger starren Cluster sind von Bereic


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Product Details
  • ISBN-13: 9783668602366
  • Publisher: Grin Verlag
  • Publisher Imprint: Grin Verlag
  • Height: 210 mm
  • No of Pages: 60
  • Spine Width: 4 mm
  • Width: 148 mm
  • ISBN-10: 3668602360
  • Publisher Date: 19 Jan 2018
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Weight: 141 gr


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