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.
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January 2020
Research Article|
January 06 2020
Direct-imaging of light-driven colloidal Janus particles in weightlessness
Special Collection:
Materials and Life Science Experiments for the Sounding Rocket MAPHEUS
R. Keßler;
R. Keßler
a)
1
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR)
, 51170 Köln, Germany
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D. Bräuer;
D. Bräuer
1
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR)
, 51170 Köln, Germany
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C. Dreißigacker;
C. Dreißigacker
1
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR)
, 51170 Köln, Germany
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J. Drescher;
J. Drescher
1
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR)
, 51170 Köln, Germany
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C. Lozano;
C. Lozano
2
University of Konstanz
, 78457 Konstanz, Germany
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C. Bechinger
;
C. Bechinger
2
University of Konstanz
, 78457 Konstanz, Germany
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P. Born
;
P. Born
1
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR)
, 51170 Köln, Germany
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Th. Voigtmann
Th. Voigtmann
1
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR)
, 51170 Köln, Germany
3
Department of Physics, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1
, 40225 Düsseldorf, Germany
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Note: This paper is part of the Special Collection: Materials and Life Science Experiments for the Sounding Rocket MAPHEUS.
Rev. Sci. Instrum. 91, 013902 (2020)
Article history
Received:
August 18 2019
Accepted:
December 13 2019
Citation
R. Keßler, D. Bräuer, C. Dreißigacker, J. Drescher, C. Lozano, C. Bechinger, P. Born, Th. Voigtmann; Direct-imaging of light-driven colloidal Janus particles in weightlessness. Rev. Sci. Instrum. 1 January 2020; 91 (1): 013902. https://doi.org/10.1063/1.5124895
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