AI 中文总结
该研究结合实验与流体动力学模拟，发现受限莱茵衣藻悬浮液的粒子间关联由偶极与夹带两种解耦流体动力学模式的竞争决定，揭示了受限活性物质时空关联的流体动力学起源。
AI 中文摘要
空间限域深刻影响各类生物系统中活性物质的输运与自组织。尽管受限活性物质中的集体有序已被广泛表征，但几何约束如何重塑近场流场及由此产生的粒子间关联，在很大程度上仍未被探索。本研究结合实验与流体动力学模拟，探究准二维莱茵衣藻（Chlamydomonas reinhardtii）悬浮液中的粒子间关联。我们揭示了表征细胞对的两种解耦模式：偶极模式与夹带模式，二者呈现出依赖密度和距离的竞争关系。结合单细胞流场分析、流体动力学模拟及主动-被动混合物研究，我们将这两种模式与奇异流体动力学及润滑诱导夹带关联起来。研究结果表明，受限活性物质中的时空关联从根本上源于这两种流体动力学机制的相互作用。
英文摘要
Spatial confinement profoundly impacts the transport and self-organization of active matter across diverse biological systems. While the collective orders in confined active matter have been extensively characterized, how geometric constraints reshape near-field flows and the resulting inter-particle correlations remains largely unexplored. In this study, we combine experiments and hydrodynamic simulations to investigate inter-particle correlations within quasi-two-dimensional Chlamydomonas reinhardtii suspensions. We reveal two disentangled modes characterizing cell pairs: a dipolar mode and an entrainment mode, which exhibit a density- and distance-dependent competition. Combining single-cell flow field analysis, hydrodynamic simulations, and active-passive mixtures, we link these two modes to singular hydrodynamics and lubrication-induced entrainment. Our results demonstrate that spatiotemporal correlations in confined active matter are fundamentally rooted in the interplay of these two hydrodynamic mechanisms.
Comments6+8 pages, 4+7 figures, 0+1 table
