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CollectSwim SIGNED

Individual and Collective Swimming of Active Microparticles

Total Cost €


EC-Contrib. €






Project "CollectSwim" data sheet

The following table provides information about the project.


Organization address
postcode: 91128

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country France [FR]
 Total cost 1˙497˙698 €
 EC max contribution 1˙497˙698 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2016-STG
 Funding Scheme ERC-STG
 Starting year 2017
 Duration (year-month-day) from 2017-09-01   to  2022-08-31


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    ECOLE POLYTECHNIQUE FR (PALAISEAU CEDEX) coordinator 1˙497˙698.00


 Project objective

Bacteria are tiny; yet their collective dynamics generate large-scale flows and profoundly modify a fluid’s viscosity or diffusivity. So do autophoretic microswimmers, an example of active microscopic particles that draw their motion from physico-chemical exchanges with their environment. How do such ``active fluids' turn individual microscopic propulsion into macroscopic fluid dynamics? What controls this self-organization process? These are fundamental questions for biologists but also for engineers, to use these suspensions for mixing or chemical sensing and, more generally, for creating active fluids whose macroscopic physical properties can be controlled precisely.

Self-propulsion of autophoretic swimmers was reported only recently. Major scientific gaps impair the quantitative understanding of their individual and collective dynamics, which is required to exploit these active fluids. Existing models scarcely account for important experimental characteristics such as complex hydrodynamics, physico-chemical processes and confinement. Thus, these models cannot yet be used as predictive tools, even at the individual level.

Further, to use phoretic suspensions as active fluids with microscopically-controlled properties, quantitatively-predictive models are needed for the collective dynamics. Instead of ad-hoc interaction rules, collective models must be built on a detailed physico-mechanical description of each swimmer’s interaction with its environment.

This project will develop these tools and validate them against experimental data. This requires overcoming several major challenges: the diversity of electro-chemical processes, the confined geometry, the large number of particles, and the plurality of interaction mechanisms and their nonlinear coupling.

To address these issues, rigorous physical, mathematical and numerical models will be developed to obtain a complete multi-scale description of the individual and collective dynamics of active particles.


year authors and title journal last update
List of publications.
2020 Sébastien Michelin, Simon Game, Eric Lauga, Eric Keaveny, Demetrios Papageorgiou
Spontaneous onset of convection in a uniform phoretic channel
published pages: 1259-1269, ISSN: 1744-683X, DOI: 10.1039/c9sm02173f
Soft Matter 16/5 2020-03-11
2020 K. Lippera, M. Morozov, M. Benzaquen, S. Michelin
Collisions and rebounds of chemically active droplets
published pages: A17, ISSN: 0022-1120, DOI: 10.1017/jfm.2019.1055
Journal of Fluid Mechanics 886 2020-03-11
2019 K. Lippera, O. Dauchot, S. Michelin, M. Benzaquen
No net motion for oscillating near-spheres at low Reynolds numbers
published pages: , ISSN: 0022-1120, DOI: 10.1017/jfm.2019.130
Journal of Fluid Mechanics 866 2020-03-11
2019 Akhil Varma, Sébastien Michelin
Modeling chemo-hydrodynamic interactions of phoretic particles: A unified framework
published pages: 124204, ISSN: 2469-990X, DOI: 10.1103/physrevfluids.4.124204
Physical Review Fluids 4/12 2020-03-11
2019 Charlotte de Blois, Mathilde Reyssat, Sébastien Michelin, Olivier Dauchot
Flow field around a confined active droplet
published pages: , ISSN: 2469-990X, DOI: 10.1103/PhysRevFluids.4.054001
Physical Review Fluids 4/5 2020-03-11
2019 Michelin, Sébastien; Lauga, Eric
Universal optimal geometry of minimal phoretic pumps
published pages: 10788, ISSN: 2045-2322, DOI: 10.17863/CAM.43202
Scientific Reports 9 2020-03-11
2019 Matvey Morozov, Sébastien Michelin
Orientational instability and spontaneous rotation of active nematic droplets
published pages: 7814-7822, ISSN: 1744-683X, DOI: 10.1039/C9SM01076A
Soft Matter 15/39 2020-03-11
2018 Akhil Varma, Thomas D. Montenegro-Johnson, Sébastien Michelin
Clustering-induced self-propulsion of isotropic autophoretic particles
published pages: 7155-7173, ISSN: 1744-683X, DOI: 10.1039/c8sm00690c
Soft Matter 14/35 2019-05-14
2019 Matvey Morozov, Sébastien Michelin
Self-propulsion near the onset of Marangoni instability of deformable active droplets
published pages: 711-738, ISSN: 0022-1120, DOI: 10.1017/jfm.2018.853
Journal of Fluid Mechanics 860 2019-05-14
2017 Sébastien Michelin, Eric Lauga
Geometric tuning of self-propulsion for Janus catalytic particles
published pages: , ISSN: 2045-2322, DOI: 10.1038/srep42264
Scientific Reports 7/1 2019-05-14
2019 Eva Kanso, Sébastien Michelin
Phoretic and hydrodynamic interactions of weakly confined autophoretic particles
published pages: 44902, ISSN: 0021-9606, DOI: 10.1063/1.5065656
The Journal of Chemical Physics 150/4 2019-05-14
2018 Sébastien Michelin, Etienne Guérin, Eric Lauga
Collective dissolution of microbubbles
published pages: 43601, ISSN: 2469-990X, DOI: 10.1103/physrevfluids.3.043601
Physical Review Fluids 3/4 2019-05-14
2019 Matvey Morozov, Sébastien Michelin
Nonlinear dynamics of a chemically-active drop: From steady to chaotic self-propulsion
published pages: 44110, ISSN: 0021-9606, DOI: 10.1063/1.5080539
The Journal of Chemical Physics 150/4 2019-05-14
2019 Sébastien Michelin, Giacomo Gallino, François Gallaire, Eric Lauga
Viscous growth and rebound of a bubble near a rigid surface
published pages: 172-199, ISSN: 0022-1120, DOI: 10.1017/jfm.2018.876
Journal of Fluid Mechanics 860 2019-05-14
2018 Giacomo Gallino, François Gallaire, Eric Lauga, Sebastien Michelin
Physics of Bubble-Propelled Microrockets
published pages: 1800686, ISSN: 1616-301X, DOI: 10.1002/adfm.201800686
Advanced Functional Materials 28/25 2019-05-14

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