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Single Janus particles in a complex plasma environment

Luoni, Francesca (2018) Single Janus particles in a complex plasma environment. Master's, Politecnico di Milano.

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Abstract

In the present work a never explored field is experimentally investigated: active particles in a complex plasma environment. Janus particles belong to a special category of particles that are active in aqueous solutions because of their intrinsic asymmetry. The aim is to discover if they are also active when suspended in a low-temperature weakly-ionized plasma. The forces which can potentially act as propulsion mechanisms in a plasma environment are investigated both theoretically and experimentally. The Janus particles used are 9.27 um diameter melamine-formaldehyde spheres half covered with 10 nm of platinum. The result of the present work is that they are active in a complex plasma environment. The propulsion mechanism is the thermophoresis due to different accommodation coefficients on the particle surface in case non-strong light source is used. In the case a laser light is used to illuminate the Janus particle, the net force acting on the particle as self-propulsion is due to a combination of thermophoresis due to different accommodation coefficients, photophoresis due to a temperature gradient on the particle surface and alternating radiation pressure force.

Item URL in elib:https://elib.dlr.de/125048/
Document Type:Thesis (Master's)
Title:Single Janus particles in a complex plasma environment
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Luoni, FrancescaPolitecnico di MilanoUNSPECIFIED
Date:October 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:201
Status:Published
Keywords:complex plasma, active matter, Janus particles
Institution:Politecnico di Milano
Department:School of Industrial Engineering and Informatics
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 - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Komplexe Plasmen / Laboratory research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Materials Physics in Space > Research Group Complex Plasma
Deposited By: Nosenko, Volodymyr
Deposited On:17 Dec 2018 08:54
Last Modified:17 Dec 2018 08:54

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