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Non-Equilibrium Fluidization of Dense Active Suspension

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arxiv 2401.15658 v2 pith:FMDX2QPJ submitted 2024-01-28 cond-mat.soft cond-mat.stat-mechphysics.bio-ph

classification cond-mat.softcond-mat.stat-mechphysics.bio-ph
keywords activedenseomegashowedsuspensionsviscosityactivityagreement
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abstract

We investigate dense suspensions of swimming bacteria prepared in a nutrient-exchange chamber. Near the pellet concentration, nonthermal fluctuations showed notable agreement between self and collective behaviors, a phenomenon not previously observed at equilibrium. The viscosity of active suspensions dramatically decreased compared to their inactive counterparts, where glassy features, such as non-Newtonian viscosity and dynamic heterogeneity, disappeared. Instead, the complex shear modulus showed a power-law rheology,$G^*(\omega)\propto\left(-i\omega\right)^\frac{1}{2}$, indicating the role of bacterial activity in driving the system towards a critical jamming state.

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Cited by 1 Pith paper

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  1. Influence of active breathing on rheology and jamming of amorphous solids: insights from microscopic and mesoscale analysis

    cond-mat.soft 2025-05 conditional novelty 5.0 of 10

    Periodic internal size oscillations fluidize a jammed 2D amorphous solid above a critical amplitude and convert yield-stress rheology to Newtonian flow.

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