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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2401.15658 |
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| _version_ | 1866917580159057920 |
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| author | Sugino, Yujiro Ebata, Hiroyuki Sowa, Yoshiyuki Ikeda, Atsushi Mizuno, Daisuke |
| author_facet | Sugino, Yujiro Ebata, Hiroyuki Sowa, Yoshiyuki Ikeda, Atsushi Mizuno, Daisuke |
| contents | 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,$G^*(ω)\propto\left(-iω\right)^\frac{1}{2}$, indicating the role of bacterial activity in driving the system towards a critical jamming state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_15658 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Non-Equilibrium Fluidization of Dense Active Suspension Sugino, Yujiro Ebata, Hiroyuki Sowa, Yoshiyuki Ikeda, Atsushi Mizuno, Daisuke Soft Condensed Matter Statistical Mechanics Biological Physics 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,$G^*(ω)\propto\left(-iω\right)^\frac{1}{2}$, indicating the role of bacterial activity in driving the system towards a critical jamming state. |
| title | Non-Equilibrium Fluidization of Dense Active Suspension |
| topic | Soft Condensed Matter Statistical Mechanics Biological Physics |
| url | https://arxiv.org/abs/2401.15658 |