Designing self-propelled, chemically active sheets: Wrappers, flappers, and creepers
Designing self-propelled, chemically active sheets: Wrappers, flappers, and creepers
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DOI：
10.1126/sciadv.aav1745
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发表时间：
2018-12-01
期刊：
影响因子：
13.6
通讯作者：
Balazs, Anna C.
中科院分区：
文献类型：
--
作者：
Laskar, Abhrajit;Shklyaev, Oleg E.;Balazs, Anna C.
涂有催化剂的硬颗粒可以自发产生流体流动，从而推动颗粒穿过流体。如果涂有催化剂的物体是一个可变形的薄片，那么自生的流动不仅会影响薄片的运动，还会影响其形状。通过开发捕获相互关联的化学，流体动力学和机械相互作用的模型，我们发现了以前未研究的活性，软片和周围流体之间的耦合出现的新行为。化学产生的流动将片材“雕刻”成各种形式，产生不同的功能，可以通过修改片材的几何形状，用不同的催化剂图案化片材的表面，以及使用化学反应的级联来定制。这些研究揭示了如何实现空间和时间控制的位置和形状的活动片，从而使用层自主和可控地捕获软物体，执行逻辑运算，并执行多级过程中充满流体的微室。
Catalyst-coated, hard particles can spontaneously generate fluid flows, which, in turn, propel the particles through the fluid. If the catalyst-coated object were a deformable sheet, then the self-generated flows could affect not only the sheet's motion but also its shape. By developing models that capture the interrelated chemical, hydrodynamic, and mechanical interactions, we uncover novel behavior emerging from the previously unstudied coupling between active, soft sheets and the surrounding fluid. The chemically generated flows "sculpt" the sheet into various forms that yield different functionalities, which can be tailored by modifying the sheet's geometry, patterning the sheet's surface with different catalysts, and using cascades of chemical reactions. These studies reveal how to achieve both spatial and temporal controls over the position and shape of active sheets and thus use the layers to autonomously and controllably trap soft objects, perform logic operations, and execute multistage processes in fluid-filled microchambers.