磁驱动异时波诱导自组装运动
Magnetically powered metachronal waves induce locomotion in self-assemblies
摘要：
当微小的软铁磁颗粒沿着液体界面放置并暴露于垂直磁场时，毛细吸引力和磁排斥力之间的平衡导致自组织成明确定义的图案。在这里，我们实验证明，进动磁场诱导异时波的外围这些组件，类似于在纤毛虫和一些节肢动物中观察到的。最外层的粒子表现得像一排纤毛或腿，它们的顺序运动导致了一个网络和可控的运动。这种生物启发的多粒子游泳策略即使在低雷诺数下也是有效的，仅使用空间均匀的场来产生波。
英文摘要：
When tiny soft ferromagnetic particles are placed along a liquid interface and exposed to a vertical magnetic field, the balance between capillary attraction and magnetic repulsion leads to self-organization into well-defined patterns. Here, we demonstrate experimentally that precessing magnetic fields induce metachronal waves on the periphery of these assemblies, similar to the ones observed in ciliates and some arthropods. The outermost layer of particles behaves like an array of cilia or legs whose sequential movement causes a net and controllable locomotion. This bioinspired many-particle swimming strategy is effective even at low Reynolds number, using only spatially uniform fields to generate the waves.
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