论文标题
通过表面驱动的光控制的活动物质工程可重构流程模式
Engineering reconfigurable flow patterns via surface-driven light-controlled active matter
论文作者
论文摘要
表面驱动的流本质上是普遍存在的，从亚细胞胞质流到器官大小的睫状阵列。在这里，我们对限制的几何形状进行建模，以设计由仅在边界上规定的活动驱动的复合物流体动力模式。具体而言，我们模拟了光控制的表面驱动的活动物质，探测了活跃胶体的悬架的新兴特性，这些胶体可以结合并解开封闭的微型室的预制表面，从而形成活跃的地毯。附着的胶体产生的大规模流动又可以将脱离颗粒朝墙壁上方。用光切换粒子速度，我们对主动悬架进行了编程，并演示了以拓扑缺陷为特征的流动图案的丰富设计空间。我们得出了可能的模式结构，并使用该理论来优化不同的微流体函数，包括流体动力学隔室化和混合混合。我们的结果为设计和控制表面驱动的活性流体铺平了道路。
Surface-driven flows are ubiquitous in nature, from subcellular cytoplasmic streaming to organ-scale ciliary arrays. Here, we model how confined geometries can be used to engineer complex hydrodynamic patterns driven by activity prescribed solely on the boundary. Specifically, we simulate light-controlled surface-driven active matter, probing the emergent properties of a suspension of active colloids that can bind and unbind pre-patterned surfaces of a closed microchamber, together creating an active carpet. The attached colloids generate large scale flows that in turn can advect detached particles towards the walls. Switching the particle velocities with light, we program the active suspension and demonstrate a rich design space of flow patterns characterised by topological defects. We derive the possible mode structures and use this theory to optimise different microfluidic functions including hydrodynamic compartmentalisation and chaotic mixing. Our results pave the way towards designing and controlling surface-driven active fluids.
