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Direct-imaging of light-driven colloidal Janus particles in weightlessness

Keßler, Raphael and Bräuer, Dirk and Dreißigacker, Christoph and Drescher, Jörg and Lozano, Celia and Bechinger, Clemens and Born, Philip and Voigtmann, Thomas (2020) Direct-imaging of light-driven colloidal Janus particles in weightlessness. Review of Scientific Instruments, 91, 013902. American Institute of Physics (AIP). doi: 10.1063/1.5124895. ISSN 0034-6748.

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We describe a highly integrated automated experiment module that allows us to investigate the active Brownian motion of light-driven colloidal Janus-particle suspensions. The module RAMSES (RAndom Motion of SElf-propelled particles in Space) is designed for the sounding rocket platform MAPHEUS (MAterialPHysikalische Experimente Unter Schwerelosigkeit). It allows us to perform experiments under weightlessness conditions in order to avoid sedimentation of the Janus particles and thus to study the spatially three-dimensional dynamics in the suspension. The module implements a newly developed strong homogeneous light source to excite self-propulsion in the Janus particles. The light source is realized through an array of high-power light-emitting diodes and replaces the conventional laser source, thus reducing heat dissipation and spatial extension of the experiment setup. The rocket module contains ten independent sample cells in order to ease the systematic study of the effect of control parameters such as light intensity or particle concentration and size in a single sounding-rocket flight. For each sample cell, transmitted light intensities are stored for postflight analysis in terms of differential dynamical microscopy.

Item URL in elib:https://elib.dlr.de/133264/
Document Type:Article
Title:Direct-imaging of light-driven colloidal Janus particles in weightlessness
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Keßler, RaphaelRaphael.Kessler (at) dlr.deUNSPECIFIED
Bräuer, Dirkdirk.braeuer (at) dlr.deUNSPECIFIED
Dreißigacker, ChristophChristoph.Dreissigacker (at) dlr.deUNSPECIFIED
Drescher, Jörgjoerg.drescher (at) dlr.deUNSPECIFIED
Lozano, CeliaUniversität KonstanzUNSPECIFIED
Bechinger, ClemensUniversität KonstanzUNSPECIFIED
Born, PhilipPhilip.Born (at) dlr.deUNSPECIFIED
Voigtmann, ThomasThomas.Voigtmann (at) dlr.deUNSPECIFIED
Date:6 January 2020
Journal or Publication Title:Review of Scientific Instruments
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1063/1.5124895
Page Range:013902
Publisher:American Institute of Physics (AIP)
Keywords:microgravity experiments; colloidal suspensions; active particles; microswimmers; sounding rocket; MAPHEUS
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 - Research under Space Conditions
DLR - Research theme (Project):R - Project Mapheus (payload) (old), R - Materials Research and Microgravity (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Voigtmann, Dr.rer.nat. Thomas
Deposited On:07 Jan 2020 15:07
Last Modified:07 Jan 2020 15:07

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