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Rhéologie et comportement de suspensions de Escherichia Coli en milieux confinés

Abstract : If we put active particles, ie. motile particles, in suspension into a _uid, collective behaviors can occur. In this document, we present experimental works using Escherichia Coli, a biological particle, micro_uidic devices, and numerical simulations. By these ways, we caracterized these swimmers, their collective motions, the impact of an external shear on their behavior, and rheological behavior of this kind of suspensions. We show that the typical size of these collective motions increases smoothly with the volume fraction, and that a critical shear rate exist and is the same for individual and collective motion under shear. We also show for that bacterial suspensions have a non-newtonian viscosity and describe their rheological behavior.
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Contributor : Jérémie Gachelin Connect in order to contact the contributor
Submitted on : Monday, January 26, 2015 - 1:22:06 PM
Last modification on : Friday, August 5, 2022 - 11:54:24 AM
Long-term archiving on: : Friday, September 11, 2015 - 9:20:22 AM


  • HAL Id : tel-01109446, version 1


Jeremie Gachelin. Rhéologie et comportement de suspensions de Escherichia Coli en milieux confinés. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2014. Français. ⟨NNT : 2014PA066406⟩. ⟨tel-01109446⟩



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