期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.028103
关键词
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资金
- EU network ITN-COMPLOIDS [FP7-234810]
- EPSRC [EP/J007404/1]
- Royal Society
- Engineering and Physical Sciences Research Council [EP/J007404/1] Funding Source: researchfish
- EPSRC [EP/J007404/1] Funding Source: UKRI
We simulate an experiment in which a colloidal probe is pulled through an active nematic fluid. We find that the drag on the particle is non-Stokesian (not proportional to its radius). Strikingly, a large enough particle in contractile fluid (such as an actomyosin gel) can show negative viscous drag in steady state: the particle moves in the opposite direction to the externally applied force. We explain this, and the qualitative trends seen in our simulations, in terms of the disruption of orientational order around the probe particle and the resulting modifications to the active stress.
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