Article (Scientific journals)
Statistics of Colloidal Suspensions Stirred by Microswimmers
Ortlieb, Levke; Rafai, Salima; Peyla, Philippe et al.
2019In Physical Review Letters, 122 (14)
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Abstract :
[en] 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).
Disciplines :
Physics
Author, co-author :
Ortlieb, Levke
Rafai, Salima
Peyla, Philippe
Wagner, Christian ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
John, Thomas
External co-authors :
yes
Language :
English
Title :
Statistics of Colloidal Suspensions Stirred by Microswimmers
Publication date :
2019
Journal title :
Physical Review Letters
ISSN :
1079-7114
Publisher :
American Physical Society, New York, United States - New York
Volume :
122
Issue :
14
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 15 January 2020

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