ACTIVE MATTER Transition from turbulent to coherent flows in confined three-dimensional active fluids
ACTIVE MATTER Transition from turbulent to coherent flows in confined three-dimensional active fluids
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DOI：
10.1126/science.aal1979
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发表时间：
2017-03-24
期刊：
影响因子：
56.9
通讯作者：
Dogic, Zvonimir
中科院分区：
文献类型：
--
作者：
Wu, Kun-Ta;Hishamunda, Jean Bernard;Dogic, Zvonimir
通过管道输送流体对于宏观机器和微流体装置的操作是必不可少的。传统的流体只在外部压力下流动。我们证明了一个积极的各向同性流体，由微管和分子马达，自主流过米长的三维通道。我们建立控制的幅度，速度分布，和方向的自组织流和相关的可伸展的微管束的结构。固有的三维过渡，从散装湍流的约束相干流发生伴随着在表面附近的束取向顺序的过渡，并由一个规模不变的标准相关的通道轮廓控制。受限各向同性活性流体的非平衡相变可以用来设计自组织软机器。
Transport of fluid through a pipe is essential for the operation of macroscale machines and microfluidic devices. Conventional fluids only flow in response to external pressure. We demonstrate that an active isotropic fluid, composed of microtubules and molecular motors, autonomously flows through meter-long three-dimensional channels. We establish control over the magnitude, velocity profile, and direction of the self-organized flows and correlate these to the structure of the extensile microtubule bundles. The inherently three-dimensional transition from bulk-turbulent to confined-coherent flows occurs concomitantly with a transition in the bundle orientational order near the surface and is controlled by a scale-invariant criterion related to the channel profile. The nonequilibrium transition of confined isotropic active fluids can be used to engineer self-organized soft machines.