Bitte benutzen Sie diese Referenz, um auf diese Ressource zu verweisen:
Volltext verfügbar? / Dokumentlieferung
doi:10.22028/D291-28640
Titel: | Statistics of Colloidal Suspensions Stirred by Microswimmers |
VerfasserIn: | Ortlieb, Levke Rafaï, Salima Peyla, Philippe Wagner, Christian John, Thomas |
Sprache: | Englisch |
Titel: | Physical review letters |
Bandnummer: | 122 |
Heft: | 14 |
Verlag/Plattform: | APS |
Erscheinungsjahr: | 2019 |
Dokumenttyp: | Journalartikel / Zeitschriftenartikel |
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 der Erstveröffentlichung: | 10.1103/PhysRevLett.122.148101 |
URL der Erstveröffentlichung: | https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.148101 |
Link zu diesem Datensatz: | hdl:20.500.11880/27697 http://dx.doi.org/10.22028/D291-28640 |
ISSN: | 1079-7114 0031-9007 |
Datum des Eintrags: | 7-Sep-2019 |
Fakultät: | NT - Naturwissenschaftlich- Technische Fakultät |
Fachrichtung: | NT - Physik |
Professur: | NT - Prof. Dr. Christian Wagner |
Sammlung: | SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
Dateien zu diesem Datensatz:
Es gibt keine Dateien zu dieser Ressource.
Alle Ressourcen in diesem Repository sind urheberrechtlich geschützt.