Submersed micropatterned structures control active nematic flow, topology, and concentration
Submersed micropatterned structures control active nematic flow, topology, and concentration
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DOI：
10.1073/pnas.2106038118
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发表时间：
2021-09-21
影响因子：
11.1
通讯作者：
Shendruk, Tyler N.
中科院分区：
文献类型：
--
作者：
Thijssen, Kristian;Khaladj, Dimitrius A.;Shendruk, Tyler N.
流动和材料性质之间的耦合使流变性物质具有广泛的适用性，因此人们对利用活性流体的流变性感到兴奋，对于这些流体，内部结构和持续的能量注入导致了自发流动和复杂的、不平衡的动力学。我们提出并演示了一种方便的、高度可调的方法来控制活性薄膜中的流动、拓扑和成分。我们的方法通过在薄的底层油层内间接存在完全淹没的微图案结构来建立流变性耦合。模拟表明，由于粘性耗散随深度的不同，微图案化结构在上一层活性向列相薄膜内产生了有效的虚拟边界。这种对活性薄膜施加位置相关的有效耗散的方法为设计活性微流控系统提供了一条非侵入性的途径。
Coupling between flows and material properties imbues rheological matter with its wide-ranging applicability, hence the excitement for harnessing the rheology of active fluids for which internal structure and continuous energy injection lead to spontaneous flows and complex, out-of-equilibrium dynamics. We propose and demonstrate a convenient, highly tunable method for controlling flow, topology, and composition within active films. Our approach establishes rheological coupling via the indirect presence of fully submersed micropatterned structures within a thin, underlying oil layer. Simulations reveal that micropatterned structures produce effective virtual boundaries within the superjacent active nematic film due to differences in viscous dissipation as a function of depth. This accessible method of applying positiondependent, effective dissipation to the active films presents a nonintrusive pathway for engineering active microfluidic systems.