Chemotaxis mediated interactions can stabilize the hydrodynamic instabilities in active suspensions.
Chemotaxis mediated interactions can stabilize the hydrodynamic instabilities in active suspensions.
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DOI：
10.1039/c9sm00058e
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发表时间：
2017-12
期刊：
影响因子：
3.4
通讯作者：
M. R. Nejad;A. Najafi
中科院分区：
文献类型：
--
作者：
M. R. Nejad;A. Najafi
极地游泳者主动悬浮液中的有序相处于长波长流体动力学介导的不稳定性之下。在这篇文章中，我们表明，溶解在水悬浮液中的化学分子，作为大多数湿活性系统的不可避免的一部分，可以介导长程相互作用，随后稳定的极性相。活悬浮液中的化学引诱剂和合成Janus悬浮液中的溶解分子使人想起这样的化学分子。游泳者之间通过这些化学物质的梯度进行交流是这种稳定机制的基础。为了对这种主动系统的稳定状态进行分类，我们研究了两类具有动量守恒和非守恒动力学的系统的详细相图。我们的线性稳定性分析表明，所提出的稳定机制可以适用于不同动力学特性的游泳运动员，例如，推动器或拉动器，并且具有各种静态特性，例如，球形、扁球形或长球形几何形状。
Ordered phases in active suspensions of polar swimmers are under long-wavelength hydrodynamic mediated instabilities. In this article, we show that chemical molecules dissolved in aqueous suspensions, as an unavoidable part of most wet active systems, can mediate long-range interactions and subsequently stabilize the polar phase. Chemoattractants in living suspensions and dissolved molecules in synthesized Janus suspensions are reminiscent of such chemical molecules. Communication between swimmers through the gradients of such chemicals is the foundation of this stabilization mechanism. To classify the stable states of such active systems, we investigate the detailed phase diagrams for two classes of systems with momentum conserving and non-conserving dynamics. Our linear stability analysis shows that the proposed stabilization mechanism can work for swimmers with different dynamical properties, e.g., pushers or pullers and with various static characteristics, e.g., spherical, oblate or prolate geometries.