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Autor(en): Sachs, Johannes
Kottapalli, S. Nikhilesh
Fischer, Peer
Botin, Denis
Palberg, Thomas
Titel: Characterization of active matter in dense suspensions with heterodyne laser Doppler velocimetry
Erscheinungsdatum: 2020
Dokumentart: Zeitschriftenartikel
Seiten: 269-280
Erschienen in: Colloid and polymer science 299 (2021), S. 269-280
URI: http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-131467
http://elib.uni-stuttgart.de/handle/11682/13146
http://dx.doi.org/10.18419/opus-13127
ISSN: 0303-402X
1435-1536
Zusammenfassung: We present a novel approach for characterizing the properties and performance of active matter in dilute suspension as well as in crowded environments. We use Super-Heterodyne Laser-Doppler-Velocimetry (SH-LDV) to study large ensembles of catalytically active Janus particles moving under UV illumination. SH-LDV facilitates a model-free determination of the swimming speed and direction, with excellent ensemble averaging. In addition, we obtain information on the distribution of the catalytic activity. Moreover, SH-LDV operates away from walls and permits a facile correction for multiple scattering contributions. It thus allows for studies of concentrated suspensions of swimmers or of systems where swimmers propel actively in an environment crowded by passive particles. We demonstrate the versatility and the scope of the method with a few selected examples. We anticipate that SH-LDV complements established methods and paves the way for systematic measurements at previously inaccessible boundary conditions.
Enthalten in den Sammlungen:03 Fakultät Chemie

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