Please use this identifier to cite or link to this item:
Volltext verfügbar? / Dokumentlieferung
doi:10.22028/D291-28640
Title: | Statistics of Colloidal Suspensions Stirred by Microswimmers |
Author(s): | Ortlieb, Levke Rafaï, Salima Peyla, Philippe Wagner, Christian John, Thomas |
Language: | English |
Title: | Physical review letters |
Volume: | 122 |
Issue: | 14 |
Publisher/Platform: | APS |
Year of Publication: | 2019 |
Publikation type: | Journal Article |
Abstract: | We present a statistical analysis of the experimental trajectories of colloids in a dilute suspension of the green algae Chlamydomonas reinhardtii. The measured probability density function (pdf) of the displacements of colloids covers 7 orders of magnitude. The pdfs are characterized by non-Gaussian tails for intermediate time intervals, but nevertheless they collapse when scaled with their standard deviation. This diffusive scaling breaks down for longer time intervals and the pdf becomes Gaussian. However, the mean squared displacements of tracer positions are linear over the complete measurement time interval. Experiments are performed for various tracer diameters, swimmer concentrations, and mean swimmer velocities. This allows a rigorous comparison with several theoretical models. We can exclude a description based on an effective temperature and other mean field approaches that describe the irregular motion as a sum of the fluctuating far field of many microswimmers. The data are best described by the microscopic model by J.-L. Thiffeault, Distribution of particle displacements due to swimming microorganisms, Phys. Rev. E 92, 023023 (2015)PRESCM1539-375510.1103/PhysRevE.92.023023. |
DOI of the first publication: | 10.1103/PhysRevLett.122.148101 |
URL of the first publication: | https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.148101 |
Link to this record: | hdl:20.500.11880/27697 http://dx.doi.org/10.22028/D291-28640 |
ISSN: | 1079-7114 0031-9007 |
Date of registration: | 7-Sep-2019 |
Faculty: | NT - Naturwissenschaftlich- Technische Fakultät |
Department: | NT - Physik |
Professorship: | NT - Prof. Dr. Christian Wagner |
Collections: | SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
Files for this record:
There are no files associated with this item.
Items in SciDok are protected by copyright, with all rights reserved, unless otherwise indicated.