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Communication Dans Un Congrès Année : 2019

Rheological response and direct visualization of collective patterns formation leading to shear-bands formation in a suspension of active E.coli at the super-fluidity transition

Vincent Martinez
Jochen Arlt
Adama Kpatagnon Creppy
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Harold Auradou
Jana Schwarz-Linek
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Wilson C. K. Poon

Résumé

Suspensions of motile Escherichia coli were found to display `negative viscosity increment' at low shear rate viz., adding such bacteria lowers the shear viscosity of the system (H.M.Lopez , J. Gachelin, C. Douarche, H.Auradou, E. Clément, Phys. Rev. Lett. 115, 028301 (2015)). Furthermore at higher concentrations a regime of zero viscosity, akin to a "superfluidity" transition, can be reached. Here, for a strain of very active bacteria, we report a full exploration of the rheological response changing confinement, shear rate and concentration, both in a low-shear Couette rheometer and in a cone-plane rheometer. The last allows a direct visualization of the collective organization under shear and the exploration of the different regimes leading the “superfluidity transition” in relation with the dynamics of shear-band formation. *This work was supported by the ANR grant ``BacFlow'' ANR-15-CE30-0013, PRC 1576 (CNRS-Roy.Society) and ESMI project E150200679 .
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Dates et versions

hal-04439981 , version 1 (05-02-2024)

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  • HAL Id : hal-04439981 , version 1

Citer

Eric Clement, Vincent Martinez, Jochen Arlt, Carine Douarche, Adama Kpatagnon Creppy, et al.. Rheological response and direct visualization of collective patterns formation leading to shear-bands formation in a suspension of active E.coli at the super-fluidity transition. APS March Meeting 2019, Mar 2019, Boston, United States. ⟨hal-04439981⟩
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