Non-Newtonian viscosity of Escherichia coli suspensions
Jérémie Gachelin1, Gastón Miño, Hélène Berthet
1PMMH-ESPCI, UMR 7636 CNRS-ESPCI-Universities Pierre et Marie Curie and Denis Diderot, 10 rue Vauquelin, 75005 Paris, France.
Abstract:
The viscosity of an active suspension of E. coli bacteria is determined experimentally as a function of the shear rate using a Y-shaped microfluidic channel. From the relative suspension viscosity, we identify rheological thickening and thinning regimes as well as situations at low shear rate where the viscosity of the bacteria suspension can be lower than the viscosity of the suspending fluid. In addition, bacteria concentration and velocity profiles in the bulk are directly measured in the microchannel.
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